From fb2dda8491d40630bb20437483b76f80ee1145f8 Mon Sep 17 00:00:00 2001
From: Naveen Naidu <naveennaidu479@gmail.com>
Date: Mon, 6 May 2024 16:07:49 +0530
Subject: [PATCH] Apporach 2: Remove redundant creation of Vector while reading
 line (Time: 241s)

In the 'read_line' function, we split the line at ';' and then collect
the split data into a vector. This collection is redundant because we
discard this vector at the end of function.

The 'collect()' call has to make a system call to allocate some memory
on heap, and since we do this for 1 billion lines - the extra overhead
time for creating space for vector accumulates.

Instead of using 'collect()' we only split the line and use the
interators to extract the values. This removes the necessity of talking
to the OS.
---
 flamegraph.svg                                | 491 ++++++++++++++++++
 .../flamegraph.svg                            | 491 ++++++++++++++++++
 src/main.rs                                   |   8 +-
 3 files changed, 986 insertions(+), 4 deletions(-)
 create mode 100644 flamegraph.svg
 create mode 100644 flamegraphs/02-Use-iterator-instead-of-collect-read-line/flamegraph.svg

diff --git a/flamegraph.svg b/flamegraph.svg
new file mode 100644
index 0000000..4e24786
--- /dev/null
+++ b/flamegraph.svg
@@ -0,0 +1,491 @@
+<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg version="1.1" width="1200" height="502" onload="init(evt)" viewBox="0 0 1200 502" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:fg="http://github.com/jonhoo/inferno"><!--Flame graph stack visualization. See https://github.com/brendangregg/FlameGraph for latest version, and http://www.brendangregg.com/flamegraphs.html for examples.--><!--NOTES: --><defs><linearGradient id="background" y1="0" y2="1" x1="0" x2="0"><stop stop-color="#eeeeee" offset="5%"/><stop stop-color="#eeeeb0" offset="95%"/></linearGradient></defs><style type="text/css">
+text { font-family:monospace; font-size:12px }
+#title { text-anchor:middle; font-size:17px; }
+#matched { text-anchor:end; }
+#search { text-anchor:end; opacity:0.1; cursor:pointer; }
+#search:hover, #search.show { opacity:1; }
+#subtitle { text-anchor:middle; font-color:rgb(160,160,160); }
+#unzoom { cursor:pointer; }
+#frames > *:hover { stroke:black; stroke-width:0.5; cursor:pointer; }
+.hide { display:none; }
+.parent { opacity:0.5; }
+</style><script type="text/ecmascript"><![CDATA[
+        var nametype = 'Function:';
+        var fontsize = 12;
+        var fontwidth = 0.59;
+        var xpad = 10;
+        var inverted = false;
+        var searchcolor = 'rgb(230,0,230)';
+        var fluiddrawing = true;
+        var truncate_text_right = false;
+    ]]><![CDATA["use strict";
+var details, searchbtn, unzoombtn, matchedtxt, svg, searching, frames, known_font_width;
+function init(evt) {
+    details = document.getElementById("details").firstChild;
+    searchbtn = document.getElementById("search");
+    unzoombtn = document.getElementById("unzoom");
+    matchedtxt = document.getElementById("matched");
+    svg = document.getElementsByTagName("svg")[0];
+    frames = document.getElementById("frames");
+    known_font_width = get_monospace_width(frames);
+    total_samples = parseInt(frames.attributes.total_samples.value);
+    searching = 0;
+
+    // Use GET parameters to restore a flamegraph's state.
+    var restore_state = function() {
+        var params = get_params();
+        if (params.x && params.y)
+            zoom(find_group(document.querySelector('[*|x="' + params.x + '"][y="' + params.y + '"]')));
+        if (params.s)
+            search(params.s);
+    };
+
+    if (fluiddrawing) {
+        // Make width dynamic so the SVG fits its parent's width.
+        svg.removeAttribute("width");
+        // Edge requires us to have a viewBox that gets updated with size changes.
+        var isEdge = /Edge\/\d./i.test(navigator.userAgent);
+        if (!isEdge) {
+            svg.removeAttribute("viewBox");
+        }
+        var update_for_width_change = function() {
+            if (isEdge) {
+                svg.attributes.viewBox.value = "0 0 " + svg.width.baseVal.value + " " + svg.height.baseVal.value;
+            }
+
+            // Keep consistent padding on left and right of frames container.
+            frames.attributes.width.value = svg.width.baseVal.value - xpad * 2;
+
+            // Text truncation needs to be adjusted for the current width.
+            update_text_for_elements(frames.children);
+
+            // Keep search elements at a fixed distance from right edge.
+            var svgWidth = svg.width.baseVal.value;
+            searchbtn.attributes.x.value = svgWidth - xpad;
+            matchedtxt.attributes.x.value = svgWidth - xpad;
+        };
+        window.addEventListener('resize', function() {
+            update_for_width_change();
+        });
+        // This needs to be done asynchronously for Safari to work.
+        setTimeout(function() {
+            unzoom();
+            update_for_width_change();
+            restore_state();
+        }, 0);
+    } else {
+        restore_state();
+    }
+}
+// event listeners
+window.addEventListener("click", function(e) {
+    var target = find_group(e.target);
+    if (target) {
+        if (target.nodeName == "a") {
+            if (e.ctrlKey === false) return;
+            e.preventDefault();
+        }
+        if (target.classList.contains("parent")) unzoom();
+        zoom(target);
+
+        // set parameters for zoom state
+        var el = target.querySelector("rect");
+        if (el && el.attributes && el.attributes.y && el.attributes["fg:x"]) {
+            var params = get_params()
+            params.x = el.attributes["fg:x"].value;
+            params.y = el.attributes.y.value;
+            history.replaceState(null, null, parse_params(params));
+        }
+    }
+    else if (e.target.id == "unzoom") {
+        unzoom();
+
+        // remove zoom state
+        var params = get_params();
+        if (params.x) delete params.x;
+        if (params.y) delete params.y;
+        history.replaceState(null, null, parse_params(params));
+    }
+    else if (e.target.id == "search") search_prompt();
+}, false)
+// mouse-over for info
+// show
+window.addEventListener("mouseover", function(e) {
+    var target = find_group(e.target);
+    if (target) details.nodeValue = nametype + " " + g_to_text(target);
+}, false)
+// clear
+window.addEventListener("mouseout", function(e) {
+    var target = find_group(e.target);
+    if (target) details.nodeValue = ' ';
+}, false)
+// ctrl-F for search
+window.addEventListener("keydown",function (e) {
+    if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) {
+        e.preventDefault();
+        search_prompt();
+    }
+}, false)
+// functions
+function get_params() {
+    var params = {};
+    var paramsarr = window.location.search.substr(1).split('&');
+    for (var i = 0; i < paramsarr.length; ++i) {
+        var tmp = paramsarr[i].split("=");
+        if (!tmp[0] || !tmp[1]) continue;
+        params[tmp[0]]  = decodeURIComponent(tmp[1]);
+    }
+    return params;
+}
+function parse_params(params) {
+    var uri = "?";
+    for (var key in params) {
+        uri += key + '=' + encodeURIComponent(params[key]) + '&';
+    }
+    if (uri.slice(-1) == "&")
+        uri = uri.substring(0, uri.length - 1);
+    if (uri == '?')
+        uri = window.location.href.split('?')[0];
+    return uri;
+}
+function find_child(node, selector) {
+    var children = node.querySelectorAll(selector);
+    if (children.length) return children[0];
+    return;
+}
+function find_group(node) {
+    var parent = node.parentElement;
+    if (!parent) return;
+    if (parent.id == "frames") return node;
+    return find_group(parent);
+}
+function orig_save(e, attr, val) {
+    if (e.attributes["fg:orig_" + attr] != undefined) return;
+    if (e.attributes[attr] == undefined) return;
+    if (val == undefined) val = e.attributes[attr].value;
+    e.setAttribute("fg:orig_" + attr, val);
+}
+function orig_load(e, attr) {
+    if (e.attributes["fg:orig_"+attr] == undefined) return;
+    e.attributes[attr].value = e.attributes["fg:orig_" + attr].value;
+    e.removeAttribute("fg:orig_" + attr);
+}
+function g_to_text(e) {
+    var text = find_child(e, "title").firstChild.nodeValue;
+    return (text)
+}
+function g_to_func(e) {
+    var func = g_to_text(e);
+    // if there's any manipulation we want to do to the function
+    // name before it's searched, do it here before returning.
+    return (func);
+}
+function get_monospace_width(frames) {
+    // Given the id="frames" element, return the width of text characters if
+    // this is a monospace font, otherwise return 0.
+    text = find_child(frames.children[0], "text");
+    originalContent = text.textContent;
+    text.textContent = "!";
+    bangWidth = text.getComputedTextLength();
+    text.textContent = "W";
+    wWidth = text.getComputedTextLength();
+    text.textContent = originalContent;
+    if (bangWidth === wWidth) {
+        return bangWidth;
+    } else {
+        return 0;
+    }
+}
+function update_text_for_elements(elements) {
+    // In order to render quickly in the browser, you want to do one pass of
+    // reading attributes, and one pass of mutating attributes. See
+    // https://web.dev/avoid-large-complex-layouts-and-layout-thrashing/ for details.
+
+    // Fall back to inefficient calculation, if we're variable-width font.
+    // TODO This should be optimized somehow too.
+    if (known_font_width === 0) {
+        for (var i = 0; i < elements.length; i++) {
+            update_text(elements[i]);
+        }
+        return;
+    }
+
+    var textElemNewAttributes = [];
+    for (var i = 0; i < elements.length; i++) {
+        var e = elements[i];
+        var r = find_child(e, "rect");
+        var t = find_child(e, "text");
+        var w = parseFloat(r.attributes.width.value) * frames.attributes.width.value / 100 - 3;
+        var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,"");
+        var newX = format_percent((parseFloat(r.attributes.x.value) + (100 * 3 / frames.attributes.width.value)));
+
+        // Smaller than this size won't fit anything
+        if (w < 2 * known_font_width) {
+            textElemNewAttributes.push([newX, ""]);
+            continue;
+        }
+
+        // Fit in full text width
+        if (txt.length * known_font_width < w) {
+            textElemNewAttributes.push([newX, txt]);
+            continue;
+        }
+
+        var substringLength = Math.floor(w / known_font_width) - 2;
+        if (truncate_text_right) {
+            // Truncate the right side of the text.
+            textElemNewAttributes.push([newX, txt.substring(0, substringLength) + ".."]);
+            continue;
+        } else {
+            // Truncate the left side of the text.
+            textElemNewAttributes.push([newX, ".." + txt.substring(txt.length - substringLength, txt.length)]);
+            continue;
+        }
+    }
+
+    console.assert(textElemNewAttributes.length === elements.length, "Resize failed, please file a bug at https://github.com/jonhoo/inferno/");
+
+    // Now that we know new textContent, set it all in one go so we don't refresh a bazillion times.
+    for (var i = 0; i < elements.length; i++) {
+        var e = elements[i];
+        var values = textElemNewAttributes[i];
+        var t = find_child(e, "text");
+        t.attributes.x.value = values[0];
+        t.textContent = values[1];
+    }
+}
+
+function update_text(e) {
+    var r = find_child(e, "rect");
+    var t = find_child(e, "text");
+    var w = parseFloat(r.attributes.width.value) * frames.attributes.width.value / 100 - 3;
+    var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,"");
+    t.attributes.x.value = format_percent((parseFloat(r.attributes.x.value) + (100 * 3 / frames.attributes.width.value)));
+
+    // Smaller than this size won't fit anything
+    if (w < 2 * fontsize * fontwidth) {
+        t.textContent = "";
+        return;
+    }
+    t.textContent = txt;
+    // Fit in full text width
+    if (t.getComputedTextLength() < w)
+        return;
+    if (truncate_text_right) {
+        // Truncate the right side of the text.
+        for (var x = txt.length - 2; x > 0; x--) {
+            if (t.getSubStringLength(0, x + 2) <= w) {
+                t.textContent = txt.substring(0, x) + "..";
+                return;
+            }
+        }
+    } else {
+        // Truncate the left side of the text.
+        for (var x = 2; x < txt.length; x++) {
+            if (t.getSubStringLength(x - 2, txt.length) <= w) {
+                t.textContent = ".." + txt.substring(x, txt.length);
+                return;
+            }
+        }
+    }
+    t.textContent = "";
+}
+// zoom
+function zoom_reset(e) {
+    if (e.tagName == "rect") {
+        e.attributes.x.value = format_percent(100 * parseInt(e.attributes["fg:x"].value) / total_samples);
+        e.attributes.width.value = format_percent(100 * parseInt(e.attributes["fg:w"].value) / total_samples);
+    }
+    if (e.childNodes == undefined) return;
+    for(var i = 0, c = e.childNodes; i < c.length; i++) {
+        zoom_reset(c[i]);
+    }
+}
+function zoom_child(e, x, zoomed_width_samples) {
+    if (e.tagName == "text") {
+        var parent_x = parseFloat(find_child(e.parentNode, "rect[x]").attributes.x.value);
+        e.attributes.x.value = format_percent(parent_x + (100 * 3 / frames.attributes.width.value));
+    } else if (e.tagName == "rect") {
+        e.attributes.x.value = format_percent(100 * (parseInt(e.attributes["fg:x"].value) - x) / zoomed_width_samples);
+        e.attributes.width.value = format_percent(100 * parseInt(e.attributes["fg:w"].value) / zoomed_width_samples);
+    }
+    if (e.childNodes == undefined) return;
+    for(var i = 0, c = e.childNodes; i < c.length; i++) {
+        zoom_child(c[i], x, zoomed_width_samples);
+    }
+}
+function zoom_parent(e) {
+    if (e.attributes) {
+        if (e.attributes.x != undefined) {
+            e.attributes.x.value = "0.0%";
+        }
+        if (e.attributes.width != undefined) {
+            e.attributes.width.value = "100.0%";
+        }
+    }
+    if (e.childNodes == undefined) return;
+    for(var i = 0, c = e.childNodes; i < c.length; i++) {
+        zoom_parent(c[i]);
+    }
+}
+function zoom(node) {
+    var attr = find_child(node, "rect").attributes;
+    var width = parseInt(attr["fg:w"].value);
+    var xmin = parseInt(attr["fg:x"].value);
+    var xmax = xmin + width;
+    var ymin = parseFloat(attr.y.value);
+    unzoombtn.classList.remove("hide");
+    var el = frames.children;
+    var to_update_text = [];
+    for (var i = 0; i < el.length; i++) {
+        var e = el[i];
+        var a = find_child(e, "rect").attributes;
+        var ex = parseInt(a["fg:x"].value);
+        var ew = parseInt(a["fg:w"].value);
+        // Is it an ancestor
+        if (!inverted) {
+            var upstack = parseFloat(a.y.value) > ymin;
+        } else {
+            var upstack = parseFloat(a.y.value) < ymin;
+        }
+        if (upstack) {
+            // Direct ancestor
+            if (ex <= xmin && (ex+ew) >= xmax) {
+                e.classList.add("parent");
+                zoom_parent(e);
+                to_update_text.push(e);
+            }
+            // not in current path
+            else
+                e.classList.add("hide");
+        }
+        // Children maybe
+        else {
+            // no common path
+            if (ex < xmin || ex >= xmax) {
+                e.classList.add("hide");
+            }
+            else {
+                zoom_child(e, xmin, width);
+                to_update_text.push(e);
+            }
+        }
+    }
+    update_text_for_elements(to_update_text);
+}
+function unzoom() {
+    unzoombtn.classList.add("hide");
+    var el = frames.children;
+    for(var i = 0; i < el.length; i++) {
+        el[i].classList.remove("parent");
+        el[i].classList.remove("hide");
+        zoom_reset(el[i]);
+    }
+    update_text_for_elements(el);
+}
+// search
+function reset_search() {
+    var el = document.querySelectorAll("#frames rect");
+    for (var i = 0; i < el.length; i++) {
+        orig_load(el[i], "fill")
+    }
+    var params = get_params();
+    delete params.s;
+    history.replaceState(null, null, parse_params(params));
+}
+function search_prompt() {
+    if (!searching) {
+        var term = prompt("Enter a search term (regexp " +
+            "allowed, eg: ^ext4_)", "");
+        if (term != null) {
+            search(term)
+        }
+    } else {
+        reset_search();
+        searching = 0;
+        searchbtn.classList.remove("show");
+        searchbtn.firstChild.nodeValue = "Search"
+        matchedtxt.classList.add("hide");
+        matchedtxt.firstChild.nodeValue = ""
+    }
+}
+function search(term) {
+    var re = new RegExp(term);
+    var el = frames.children;
+    var matches = new Object();
+    var maxwidth = 0;
+    for (var i = 0; i < el.length; i++) {
+        var e = el[i];
+        // Skip over frames which are either not visible, or below the zoomed-to frame
+        if (e.classList.contains("hide") || e.classList.contains("parent")) {
+            continue;
+        }
+        var func = g_to_func(e);
+        var rect = find_child(e, "rect");
+        if (func == null || rect == null)
+            continue;
+        // Save max width. Only works as we have a root frame
+        var w = parseInt(rect.attributes["fg:w"].value);
+        if (w > maxwidth)
+            maxwidth = w;
+        if (func.match(re)) {
+            // highlight
+            var x = parseInt(rect.attributes["fg:x"].value);
+            orig_save(rect, "fill");
+            rect.attributes.fill.value = searchcolor;
+            // remember matches
+            if (matches[x] == undefined) {
+                matches[x] = w;
+            } else {
+                if (w > matches[x]) {
+                    // overwrite with parent
+                    matches[x] = w;
+                }
+            }
+            searching = 1;
+        }
+    }
+    if (!searching)
+        return;
+    var params = get_params();
+    params.s = term;
+    history.replaceState(null, null, parse_params(params));
+
+    searchbtn.classList.add("show");
+    searchbtn.firstChild.nodeValue = "Reset Search";
+    // calculate percent matched, excluding vertical overlap
+    var count = 0;
+    var lastx = -1;
+    var lastw = 0;
+    var keys = Array();
+    for (k in matches) {
+        if (matches.hasOwnProperty(k))
+            keys.push(k);
+    }
+    // sort the matched frames by their x location
+    // ascending, then width descending
+    keys.sort(function(a, b){
+        return a - b;
+    });
+    // Step through frames saving only the biggest bottom-up frames
+    // thanks to the sort order. This relies on the tree property
+    // where children are always smaller than their parents.
+    for (var k in keys) {
+        var x = parseInt(keys[k]);
+        var w = matches[keys[k]];
+        if (x >= lastx + lastw) {
+            count += w;
+            lastx = x;
+            lastw = w;
+        }
+    }
+    // display matched percent
+    matchedtxt.classList.remove("hide");
+    var pct = 100 * count / maxwidth;
+    if (pct != 100) pct = pct.toFixed(1);
+    matchedtxt.firstChild.nodeValue = "Matched: " + pct + "%";
+}
+function format_percent(n) {
+    return n.toFixed(4) + "%";
+}
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u64&gt;::wrapping_add (149 samples, 0.12%)</title><rect x="81.1459%" y="69" width="0.1178%" height="15" fill="rgb(235,212,8)" fg:x="102656" fg:w="149"/><text x="81.3959%" y="79.50"></text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (26 samples, 0.02%)</title><rect x="81.8328%" y="69" width="0.0206%" height="15" fill="rgb(223,33,50)" fg:x="103525" fg:w="26"/><text x="82.0828%" y="79.50"></text></g><g><title>core::hash::sip::u8to64_le (803 samples, 0.63%)</title><rect x="81.2636%" y="85" width="0.6347%" height="15" fill="rgb(219,149,13)" fg:x="102805" fg:w="803"/><text x="81.5136%" y="95.50"></text></g><g><title>core::intrinsics::copy_nonoverlapping (57 samples, 0.05%)</title><rect x="81.8533%" y="69" width="0.0451%" height="15" fill="rgb(250,156,29)" fg:x="103551" fg:w="57"/><text x="82.1033%" y="79.50"></text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (3,817 samples, 3.02%)</title><rect x="78.8946%" y="101" width="3.0172%" height="15" fill="rgb(216,193,19)" fg:x="99808" fg:w="3817"/><text x="79.1446%" y="111.50">&lt;co..</text></g><g><title>core::intrinsics::copy_nonoverlapping (17 samples, 0.01%)</title><rect x="81.8984%" y="85" width="0.0134%" height="15" fill="rgb(216,135,14)" fg:x="103608" fg:w="17"/><text x="82.1484%" y="95.50"></text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (14 samples, 0.01%)</title><rect x="83.6690%" y="69" width="0.0111%" height="15" fill="rgb(241,47,5)" fg:x="105848" fg:w="14"/><text x="83.9190%" y="79.50"></text></g><g><title>core::num::&lt;impl u64&gt;::rotate_left (92 samples, 0.07%)</title><rect x="83.7465%" y="53" width="0.0727%" height="15" fill="rgb(233,42,35)" fg:x="105946" fg:w="92"/><text x="83.9965%" y="63.50"></text></g><g><title>&lt;core::hash::sip::Sip13Rounds as core::hash::sip::Sip&gt;::c_rounds (266 samples, 0.21%)</title><rect x="83.6801%" y="69" width="0.2103%" height="15" fill="rgb(231,13,6)" 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core::iter::traits::iterator::Iterator&gt;::next (35 samples, 0.03%)</title><rect x="86.2499%" y="197" width="0.0277%" height="15" fill="rgb(215,211,37)" fg:x="109113" fg:w="35"/><text x="86.4999%" y="207.50"></text></g><g><title>hashbrown::raw::bitmask::BitMask::lowest_set_bit (35 samples, 0.03%)</title><rect x="86.2499%" y="181" width="0.0277%" height="15" fill="rgb(241,128,51)" fg:x="109113" fg:w="35"/><text x="86.4999%" y="191.50"></text></g><g><title>hashbrown::raw::RawTable&lt;T,A&gt;::bucket (547 samples, 0.43%)</title><rect x="86.2783%" y="181" width="0.4324%" height="15" fill="rgb(227,165,31)" fg:x="109149" fg:w="547"/><text x="86.5283%" y="191.50"></text></g><g><title>hashbrown::raw::Bucket&lt;T&gt;::from_base_index (547 samples, 0.43%)</title><rect x="86.2783%" y="165" width="0.4324%" height="15" fill="rgb(228,167,24)" fg:x="109149" fg:w="547"/><text x="86.5283%" y="175.50"></text></g><g><title>core::ptr::mut_ptr::&lt;impl *mut T&gt;::sub (547 samples, 0.43%)</title><rect x="86.2783%" y="149" width="0.4324%" height="15" fill="rgb(228,143,12)" fg:x="109149" fg:w="547"/><text x="86.5283%" y="159.50"></text></g><g><title>core::ptr::mut_ptr::&lt;impl *mut T&gt;::offset (277 samples, 0.22%)</title><rect x="86.4918%" y="133" width="0.2190%" height="15" fill="rgb(249,149,8)" fg:x="109419" fg:w="277"/><text x="86.7418%" y="143.50"></text></g><g><title>hashbrown::raw::RawTable&lt;T,A&gt;::find::_{{closure}} (9,752 samples, 7.71%)</title><rect x="86.2775%" y="197" width="7.7086%" height="15" fill="rgb(243,35,44)" fg:x="109148" fg:w="9752"/><text x="86.5275%" y="207.50">hashbrown::..</text></g><g><title>hashbrown::rustc_entry::_&lt;impl hashbrown::map::HashMap&lt;K,V,S,A&gt;&gt;::rustc_entry::_{{closure}} (9,204 samples, 7.28%)</title><rect x="86.7107%" y="181" width="7.2754%" height="15" fill="rgb(246,89,9)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="191.50">hashbrown:..</text></g><g><title>&lt;alloc::string::String as core::cmp::PartialEq&gt;::eq (9,204 samples, 7.28%)</title><rect x="86.7107%" y="165" width="7.2754%" height="15" fill="rgb(233,213,13)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="175.50">&lt;alloc::st..</text></g><g><title>alloc::vec::partial_eq::&lt;impl core::cmp::PartialEq&lt;alloc::vec::Vec&lt;U,A2&gt;&gt; for alloc::vec::Vec&lt;T,A1&gt;&gt;::eq (9,204 samples, 7.28%)</title><rect x="86.7107%" y="149" width="7.2754%" height="15" fill="rgb(233,141,41)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="159.50">alloc::vec..</text></g><g><title>core::slice::cmp::&lt;impl core::cmp::PartialEq&lt;[B]&gt; for [A]&gt;::eq (9,204 samples, 7.28%)</title><rect x="86.7107%" y="133" width="7.2754%" height="15" fill="rgb(239,167,4)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="143.50">core::slic..</text></g><g><title>&lt;[A] as core::slice::cmp::SlicePartialEq&lt;B&gt;&gt;::equal (9,204 samples, 7.28%)</title><rect x="86.7107%" y="117" width="7.2754%" height="15" fill="rgb(209,217,16)" fg:x="109696" fg:w="9204"/><text 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y="367.50">std::rt::lang_start_internal</text></g><g><title>std::rt::lang_start::_{{closure}} (126,501 samples, 99.99%)</title><rect x="0.0055%" y="341" width="99.9945%" height="15" fill="rgb(213,87,29)" fg:x="7" fg:w="126501"/><text x="0.2555%" y="351.50">std::rt::lang_start::_{{closure}}</text></g><g><title>std::sys_common::backtrace::__rust_begin_short_backtrace (126,501 samples, 99.99%)</title><rect x="0.0055%" y="325" width="99.9945%" height="15" fill="rgb(205,151,52)" fg:x="7" fg:w="126501"/><text x="0.2555%" y="335.50">std::sys_common::backtrace::__rust_begin_short_backtrace</text></g><g><title>core::ops::function::FnOnce::call_once (126,501 samples, 99.99%)</title><rect x="0.0055%" y="309" width="99.9945%" height="15" fill="rgb(253,215,39)" fg:x="7" fg:w="126501"/><text x="0.2555%" y="319.50">core::ops::function::FnOnce::call_once</text></g><g><title>rust_1brc::main (126,501 samples, 99.99%)</title><rect x="0.0055%" y="293" width="99.9945%" height="15" fill="rgb(221,220,41)" 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+++ b/flamegraphs/02-Use-iterator-instead-of-collect-read-line/flamegraph.svg
@@ -0,0 +1,491 @@
+<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg version="1.1" width="1200" height="502" onload="init(evt)" viewBox="0 0 1200 502" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:fg="http://github.com/jonhoo/inferno"><!--Flame graph stack visualization. See https://github.com/brendangregg/FlameGraph for latest version, and http://www.brendangregg.com/flamegraphs.html for examples.--><!--NOTES: --><defs><linearGradient id="background" y1="0" y2="1" x1="0" x2="0"><stop stop-color="#eeeeee" offset="5%"/><stop stop-color="#eeeeb0" offset="95%"/></linearGradient></defs><style type="text/css">
+text { font-family:monospace; font-size:12px }
+#title { text-anchor:middle; font-size:17px; }
+#matched { text-anchor:end; }
+#search { text-anchor:end; opacity:0.1; cursor:pointer; }
+#search:hover, #search.show { opacity:1; }
+#subtitle { text-anchor:middle; font-color:rgb(160,160,160); }
+#unzoom { cursor:pointer; }
+#frames > *:hover { stroke:black; stroke-width:0.5; cursor:pointer; }
+.hide { display:none; }
+.parent { opacity:0.5; }
+</style><script type="text/ecmascript"><![CDATA[
+        var nametype = 'Function:';
+        var fontsize = 12;
+        var fontwidth = 0.59;
+        var xpad = 10;
+        var inverted = false;
+        var searchcolor = 'rgb(230,0,230)';
+        var fluiddrawing = true;
+        var truncate_text_right = false;
+    ]]><![CDATA["use strict";
+var details, searchbtn, unzoombtn, matchedtxt, svg, searching, frames, known_font_width;
+function init(evt) {
+    details = document.getElementById("details").firstChild;
+    searchbtn = document.getElementById("search");
+    unzoombtn = document.getElementById("unzoom");
+    matchedtxt = document.getElementById("matched");
+    svg = document.getElementsByTagName("svg")[0];
+    frames = document.getElementById("frames");
+    known_font_width = get_monospace_width(frames);
+    total_samples = parseInt(frames.attributes.total_samples.value);
+    searching = 0;
+
+    // Use GET parameters to restore a flamegraph's state.
+    var restore_state = function() {
+        var params = get_params();
+        if (params.x && params.y)
+            zoom(find_group(document.querySelector('[*|x="' + params.x + '"][y="' + params.y + '"]')));
+        if (params.s)
+            search(params.s);
+    };
+
+    if (fluiddrawing) {
+        // Make width dynamic so the SVG fits its parent's width.
+        svg.removeAttribute("width");
+        // Edge requires us to have a viewBox that gets updated with size changes.
+        var isEdge = /Edge\/\d./i.test(navigator.userAgent);
+        if (!isEdge) {
+            svg.removeAttribute("viewBox");
+        }
+        var update_for_width_change = function() {
+            if (isEdge) {
+                svg.attributes.viewBox.value = "0 0 " + svg.width.baseVal.value + " " + svg.height.baseVal.value;
+            }
+
+            // Keep consistent padding on left and right of frames container.
+            frames.attributes.width.value = svg.width.baseVal.value - xpad * 2;
+
+            // Text truncation needs to be adjusted for the current width.
+            update_text_for_elements(frames.children);
+
+            // Keep search elements at a fixed distance from right edge.
+            var svgWidth = svg.width.baseVal.value;
+            searchbtn.attributes.x.value = svgWidth - xpad;
+            matchedtxt.attributes.x.value = svgWidth - xpad;
+        };
+        window.addEventListener('resize', function() {
+            update_for_width_change();
+        });
+        // This needs to be done asynchronously for Safari to work.
+        setTimeout(function() {
+            unzoom();
+            update_for_width_change();
+            restore_state();
+        }, 0);
+    } else {
+        restore_state();
+    }
+}
+// event listeners
+window.addEventListener("click", function(e) {
+    var target = find_group(e.target);
+    if (target) {
+        if (target.nodeName == "a") {
+            if (e.ctrlKey === false) return;
+            e.preventDefault();
+        }
+        if (target.classList.contains("parent")) unzoom();
+        zoom(target);
+
+        // set parameters for zoom state
+        var el = target.querySelector("rect");
+        if (el && el.attributes && el.attributes.y && el.attributes["fg:x"]) {
+            var params = get_params()
+            params.x = el.attributes["fg:x"].value;
+            params.y = el.attributes.y.value;
+            history.replaceState(null, null, parse_params(params));
+        }
+    }
+    else if (e.target.id == "unzoom") {
+        unzoom();
+
+        // remove zoom state
+        var params = get_params();
+        if (params.x) delete params.x;
+        if (params.y) delete params.y;
+        history.replaceState(null, null, parse_params(params));
+    }
+    else if (e.target.id == "search") search_prompt();
+}, false)
+// mouse-over for info
+// show
+window.addEventListener("mouseover", function(e) {
+    var target = find_group(e.target);
+    if (target) details.nodeValue = nametype + " " + g_to_text(target);
+}, false)
+// clear
+window.addEventListener("mouseout", function(e) {
+    var target = find_group(e.target);
+    if (target) details.nodeValue = ' ';
+}, false)
+// ctrl-F for search
+window.addEventListener("keydown",function (e) {
+    if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) {
+        e.preventDefault();
+        search_prompt();
+    }
+}, false)
+// functions
+function get_params() {
+    var params = {};
+    var paramsarr = window.location.search.substr(1).split('&');
+    for (var i = 0; i < paramsarr.length; ++i) {
+        var tmp = paramsarr[i].split("=");
+        if (!tmp[0] || !tmp[1]) continue;
+        params[tmp[0]]  = decodeURIComponent(tmp[1]);
+    }
+    return params;
+}
+function parse_params(params) {
+    var uri = "?";
+    for (var key in params) {
+        uri += key + '=' + encodeURIComponent(params[key]) + '&';
+    }
+    if (uri.slice(-1) == "&")
+        uri = uri.substring(0, uri.length - 1);
+    if (uri == '?')
+        uri = window.location.href.split('?')[0];
+    return uri;
+}
+function find_child(node, selector) {
+    var children = node.querySelectorAll(selector);
+    if (children.length) return children[0];
+    return;
+}
+function find_group(node) {
+    var parent = node.parentElement;
+    if (!parent) return;
+    if (parent.id == "frames") return node;
+    return find_group(parent);
+}
+function orig_save(e, attr, val) {
+    if (e.attributes["fg:orig_" + attr] != undefined) return;
+    if (e.attributes[attr] == undefined) return;
+    if (val == undefined) val = e.attributes[attr].value;
+    e.setAttribute("fg:orig_" + attr, val);
+}
+function orig_load(e, attr) {
+    if (e.attributes["fg:orig_"+attr] == undefined) return;
+    e.attributes[attr].value = e.attributes["fg:orig_" + attr].value;
+    e.removeAttribute("fg:orig_" + attr);
+}
+function g_to_text(e) {
+    var text = find_child(e, "title").firstChild.nodeValue;
+    return (text)
+}
+function g_to_func(e) {
+    var func = g_to_text(e);
+    // if there's any manipulation we want to do to the function
+    // name before it's searched, do it here before returning.
+    return (func);
+}
+function get_monospace_width(frames) {
+    // Given the id="frames" element, return the width of text characters if
+    // this is a monospace font, otherwise return 0.
+    text = find_child(frames.children[0], "text");
+    originalContent = text.textContent;
+    text.textContent = "!";
+    bangWidth = text.getComputedTextLength();
+    text.textContent = "W";
+    wWidth = text.getComputedTextLength();
+    text.textContent = originalContent;
+    if (bangWidth === wWidth) {
+        return bangWidth;
+    } else {
+        return 0;
+    }
+}
+function update_text_for_elements(elements) {
+    // In order to render quickly in the browser, you want to do one pass of
+    // reading attributes, and one pass of mutating attributes. See
+    // https://web.dev/avoid-large-complex-layouts-and-layout-thrashing/ for details.
+
+    // Fall back to inefficient calculation, if we're variable-width font.
+    // TODO This should be optimized somehow too.
+    if (known_font_width === 0) {
+        for (var i = 0; i < elements.length; i++) {
+            update_text(elements[i]);
+        }
+        return;
+    }
+
+    var textElemNewAttributes = [];
+    for (var i = 0; i < elements.length; i++) {
+        var e = elements[i];
+        var r = find_child(e, "rect");
+        var t = find_child(e, "text");
+        var w = parseFloat(r.attributes.width.value) * frames.attributes.width.value / 100 - 3;
+        var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,"");
+        var newX = format_percent((parseFloat(r.attributes.x.value) + (100 * 3 / frames.attributes.width.value)));
+
+        // Smaller than this size won't fit anything
+        if (w < 2 * known_font_width) {
+            textElemNewAttributes.push([newX, ""]);
+            continue;
+        }
+
+        // Fit in full text width
+        if (txt.length * known_font_width < w) {
+            textElemNewAttributes.push([newX, txt]);
+            continue;
+        }
+
+        var substringLength = Math.floor(w / known_font_width) - 2;
+        if (truncate_text_right) {
+            // Truncate the right side of the text.
+            textElemNewAttributes.push([newX, txt.substring(0, substringLength) + ".."]);
+            continue;
+        } else {
+            // Truncate the left side of the text.
+            textElemNewAttributes.push([newX, ".." + txt.substring(txt.length - substringLength, txt.length)]);
+            continue;
+        }
+    }
+
+    console.assert(textElemNewAttributes.length === elements.length, "Resize failed, please file a bug at https://github.com/jonhoo/inferno/");
+
+    // Now that we know new textContent, set it all in one go so we don't refresh a bazillion times.
+    for (var i = 0; i < elements.length; i++) {
+        var e = elements[i];
+        var values = textElemNewAttributes[i];
+        var t = find_child(e, "text");
+        t.attributes.x.value = values[0];
+        t.textContent = values[1];
+    }
+}
+
+function update_text(e) {
+    var r = find_child(e, "rect");
+    var t = find_child(e, "text");
+    var w = parseFloat(r.attributes.width.value) * frames.attributes.width.value / 100 - 3;
+    var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,"");
+    t.attributes.x.value = format_percent((parseFloat(r.attributes.x.value) + (100 * 3 / frames.attributes.width.value)));
+
+    // Smaller than this size won't fit anything
+    if (w < 2 * fontsize * fontwidth) {
+        t.textContent = "";
+        return;
+    }
+    t.textContent = txt;
+    // Fit in full text width
+    if (t.getComputedTextLength() < w)
+        return;
+    if (truncate_text_right) {
+        // Truncate the right side of the text.
+        for (var x = txt.length - 2; x > 0; x--) {
+            if (t.getSubStringLength(0, x + 2) <= w) {
+                t.textContent = txt.substring(0, x) + "..";
+                return;
+            }
+        }
+    } else {
+        // Truncate the left side of the text.
+        for (var x = 2; x < txt.length; x++) {
+            if (t.getSubStringLength(x - 2, txt.length) <= w) {
+                t.textContent = ".." + txt.substring(x, txt.length);
+                return;
+            }
+        }
+    }
+    t.textContent = "";
+}
+// zoom
+function zoom_reset(e) {
+    if (e.tagName == "rect") {
+        e.attributes.x.value = format_percent(100 * parseInt(e.attributes["fg:x"].value) / total_samples);
+        e.attributes.width.value = format_percent(100 * parseInt(e.attributes["fg:w"].value) / total_samples);
+    }
+    if (e.childNodes == undefined) return;
+    for(var i = 0, c = e.childNodes; i < c.length; i++) {
+        zoom_reset(c[i]);
+    }
+}
+function zoom_child(e, x, zoomed_width_samples) {
+    if (e.tagName == "text") {
+        var parent_x = parseFloat(find_child(e.parentNode, "rect[x]").attributes.x.value);
+        e.attributes.x.value = format_percent(parent_x + (100 * 3 / frames.attributes.width.value));
+    } else if (e.tagName == "rect") {
+        e.attributes.x.value = format_percent(100 * (parseInt(e.attributes["fg:x"].value) - x) / zoomed_width_samples);
+        e.attributes.width.value = format_percent(100 * parseInt(e.attributes["fg:w"].value) / zoomed_width_samples);
+    }
+    if (e.childNodes == undefined) return;
+    for(var i = 0, c = e.childNodes; i < c.length; i++) {
+        zoom_child(c[i], x, zoomed_width_samples);
+    }
+}
+function zoom_parent(e) {
+    if (e.attributes) {
+        if (e.attributes.x != undefined) {
+            e.attributes.x.value = "0.0%";
+        }
+        if (e.attributes.width != undefined) {
+            e.attributes.width.value = "100.0%";
+        }
+    }
+    if (e.childNodes == undefined) return;
+    for(var i = 0, c = e.childNodes; i < c.length; i++) {
+        zoom_parent(c[i]);
+    }
+}
+function zoom(node) {
+    var attr = find_child(node, "rect").attributes;
+    var width = parseInt(attr["fg:w"].value);
+    var xmin = parseInt(attr["fg:x"].value);
+    var xmax = xmin + width;
+    var ymin = parseFloat(attr.y.value);
+    unzoombtn.classList.remove("hide");
+    var el = frames.children;
+    var to_update_text = [];
+    for (var i = 0; i < el.length; i++) {
+        var e = el[i];
+        var a = find_child(e, "rect").attributes;
+        var ex = parseInt(a["fg:x"].value);
+        var ew = parseInt(a["fg:w"].value);
+        // Is it an ancestor
+        if (!inverted) {
+            var upstack = parseFloat(a.y.value) > ymin;
+        } else {
+            var upstack = parseFloat(a.y.value) < ymin;
+        }
+        if (upstack) {
+            // Direct ancestor
+            if (ex <= xmin && (ex+ew) >= xmax) {
+                e.classList.add("parent");
+                zoom_parent(e);
+                to_update_text.push(e);
+            }
+            // not in current path
+            else
+                e.classList.add("hide");
+        }
+        // Children maybe
+        else {
+            // no common path
+            if (ex < xmin || ex >= xmax) {
+                e.classList.add("hide");
+            }
+            else {
+                zoom_child(e, xmin, width);
+                to_update_text.push(e);
+            }
+        }
+    }
+    update_text_for_elements(to_update_text);
+}
+function unzoom() {
+    unzoombtn.classList.add("hide");
+    var el = frames.children;
+    for(var i = 0; i < el.length; i++) {
+        el[i].classList.remove("parent");
+        el[i].classList.remove("hide");
+        zoom_reset(el[i]);
+    }
+    update_text_for_elements(el);
+}
+// search
+function reset_search() {
+    var el = document.querySelectorAll("#frames rect");
+    for (var i = 0; i < el.length; i++) {
+        orig_load(el[i], "fill")
+    }
+    var params = get_params();
+    delete params.s;
+    history.replaceState(null, null, parse_params(params));
+}
+function search_prompt() {
+    if (!searching) {
+        var term = prompt("Enter a search term (regexp " +
+            "allowed, eg: ^ext4_)", "");
+        if (term != null) {
+            search(term)
+        }
+    } else {
+        reset_search();
+        searching = 0;
+        searchbtn.classList.remove("show");
+        searchbtn.firstChild.nodeValue = "Search"
+        matchedtxt.classList.add("hide");
+        matchedtxt.firstChild.nodeValue = ""
+    }
+}
+function search(term) {
+    var re = new RegExp(term);
+    var el = frames.children;
+    var matches = new Object();
+    var maxwidth = 0;
+    for (var i = 0; i < el.length; i++) {
+        var e = el[i];
+        // Skip over frames which are either not visible, or below the zoomed-to frame
+        if (e.classList.contains("hide") || e.classList.contains("parent")) {
+            continue;
+        }
+        var func = g_to_func(e);
+        var rect = find_child(e, "rect");
+        if (func == null || rect == null)
+            continue;
+        // Save max width. Only works as we have a root frame
+        var w = parseInt(rect.attributes["fg:w"].value);
+        if (w > maxwidth)
+            maxwidth = w;
+        if (func.match(re)) {
+            // highlight
+            var x = parseInt(rect.attributes["fg:x"].value);
+            orig_save(rect, "fill");
+            rect.attributes.fill.value = searchcolor;
+            // remember matches
+            if (matches[x] == undefined) {
+                matches[x] = w;
+            } else {
+                if (w > matches[x]) {
+                    // overwrite with parent
+                    matches[x] = w;
+                }
+            }
+            searching = 1;
+        }
+    }
+    if (!searching)
+        return;
+    var params = get_params();
+    params.s = term;
+    history.replaceState(null, null, parse_params(params));
+
+    searchbtn.classList.add("show");
+    searchbtn.firstChild.nodeValue = "Reset Search";
+    // calculate percent matched, excluding vertical overlap
+    var count = 0;
+    var lastx = -1;
+    var lastw = 0;
+    var keys = Array();
+    for (k in matches) {
+        if (matches.hasOwnProperty(k))
+            keys.push(k);
+    }
+    // sort the matched frames by their x location
+    // ascending, then width descending
+    keys.sort(function(a, b){
+        return a - b;
+    });
+    // Step through frames saving only the biggest bottom-up frames
+    // thanks to the sort order. This relies on the tree property
+    // where children are always smaller than their parents.
+    for (var k in keys) {
+        var x = parseInt(keys[k]);
+        var w = matches[keys[k]];
+        if (x >= lastx + lastw) {
+            count += w;
+            lastx = x;
+            lastw = w;
+        }
+    }
+    // display matched percent
+    matchedtxt.classList.remove("hide");
+    var pct = 100 * count / maxwidth;
+    if (pct != 100) pct = pct.toFixed(1);
+    matchedtxt.firstChild.nodeValue = "Matched: " + pct + "%";
+}
+function format_percent(n) {
+    return n.toFixed(4) + "%";
+}
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s..</text></g><g><title>core::num::dec2flt::&lt;impl core::str::traits::FromStr for f32&gt;::from_str (15,050 samples, 11.90%)</title><rect x="54.3887%" y="229" width="11.8965%" height="15" fill="rgb(217,163,10)" fg:x="68806" fg:w="15050"/><text x="54.6387%" y="239.50">core::num::dec2flt..</text></g><g><title>core::num::dec2flt::dec2flt (14,214 samples, 11.24%)</title><rect x="55.0495%" y="213" width="11.2357%" height="15" fill="rgb(213,25,53)" fg:x="69642" fg:w="14214"/><text x="55.2995%" y="223.50">core::num::dec2fl..</text></g><g><title>core::slice::&lt;impl [T]&gt;::first (264 samples, 0.21%)</title><rect x="66.0765%" y="197" width="0.2087%" height="15" fill="rgb(252,105,26)" fg:x="83592" fg:w="264"/><text x="66.3265%" y="207.50"></text></g><g><title>rust_1brc::read_line (46,204 samples, 36.52%)</title><rect x="30.2297%" y="261" width="36.5226%" height="15" fill="rgb(220,39,43)" fg:x="38243" fg:w="46204"/><text x="30.4797%" 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u64&gt;::wrapping_add (149 samples, 0.12%)</title><rect x="81.1459%" y="69" width="0.1178%" height="15" fill="rgb(235,212,8)" fg:x="102656" fg:w="149"/><text x="81.3959%" y="79.50"></text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (26 samples, 0.02%)</title><rect x="81.8328%" y="69" width="0.0206%" height="15" fill="rgb(223,33,50)" fg:x="103525" fg:w="26"/><text x="82.0828%" y="79.50"></text></g><g><title>core::hash::sip::u8to64_le (803 samples, 0.63%)</title><rect x="81.2636%" y="85" width="0.6347%" height="15" fill="rgb(219,149,13)" fg:x="102805" fg:w="803"/><text x="81.5136%" y="95.50"></text></g><g><title>core::intrinsics::copy_nonoverlapping (57 samples, 0.05%)</title><rect x="81.8533%" y="69" width="0.0451%" height="15" fill="rgb(250,156,29)" fg:x="103551" fg:w="57"/><text x="82.1033%" y="79.50"></text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (3,817 samples, 3.02%)</title><rect x="78.8946%" y="101" width="3.0172%" height="15" fill="rgb(216,193,19)" fg:x="99808" fg:w="3817"/><text x="79.1446%" y="111.50">&lt;co..</text></g><g><title>core::intrinsics::copy_nonoverlapping (17 samples, 0.01%)</title><rect x="81.8984%" y="85" width="0.0134%" height="15" fill="rgb(216,135,14)" fg:x="103608" fg:w="17"/><text x="82.1484%" y="95.50"></text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (14 samples, 0.01%)</title><rect x="83.6690%" y="69" width="0.0111%" height="15" fill="rgb(241,47,5)" fg:x="105848" fg:w="14"/><text x="83.9190%" y="79.50"></text></g><g><title>core::num::&lt;impl u64&gt;::rotate_left (92 samples, 0.07%)</title><rect x="83.7465%" y="53" width="0.0727%" height="15" fill="rgb(233,42,35)" fg:x="105946" fg:w="92"/><text x="83.9965%" y="63.50"></text></g><g><title>&lt;core::hash::sip::Sip13Rounds as core::hash::sip::Sip&gt;::c_rounds (266 samples, 0.21%)</title><rect x="83.6801%" y="69" width="0.2103%" height="15" fill="rgb(231,13,6)" 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13.09%)</title><rect x="71.6816%" y="229" width="13.0909%" height="15" fill="rgb(249,21,11)" fg:x="90683" fg:w="16561"/><text x="71.9316%" y="239.50">hashbrown::map::make..</text></g><g><title>core::hash::BuildHasher::hash_one (16,470 samples, 13.02%)</title><rect x="71.7536%" y="213" width="13.0189%" height="15" fill="rgb(222,201,40)" fg:x="90774" fg:w="16470"/><text x="72.0036%" y="223.50">core::hash::BuildHas..</text></g><g><title>core::hash::impls::&lt;impl core::hash::Hash for &amp;T&gt;::hash (7,557 samples, 5.97%)</title><rect x="78.7990%" y="197" width="5.9735%" height="15" fill="rgb(235,61,29)" fg:x="99687" fg:w="7557"/><text x="79.0490%" y="207.50">core::ha..</text></g><g><title>&lt;alloc::string::String as core::hash::Hash&gt;::hash (7,501 samples, 5.93%)</title><rect x="78.8432%" y="181" width="5.9293%" height="15" fill="rgb(219,207,3)" fg:x="99743" fg:w="7501"/><text x="79.0932%" y="191.50">&lt;alloc::..</text></g><g><title>core::hash::impls::&lt;impl core::hash::Hash for 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y="127.50">&lt;core::h..</text></g><g><title>core::hash::Hasher::write_u8 (3,619 samples, 2.86%)</title><rect x="81.9118%" y="101" width="2.8607%" height="15" fill="rgb(237,174,47)" fg:x="103625" fg:w="3619"/><text x="82.1618%" y="111.50">co..</text></g><g><title>&lt;core::hash::sip::Hasher&lt;S&gt; as core::hash::Hasher&gt;::write (3,375 samples, 2.67%)</title><rect x="82.1047%" y="85" width="2.6678%" height="15" fill="rgb(206,201,31)" fg:x="103869" fg:w="3375"/><text x="82.3547%" y="95.50">&lt;c..</text></g><g><title>core::hash::sip::u8to64_le (927 samples, 0.73%)</title><rect x="84.0397%" y="69" width="0.7328%" height="15" fill="rgb(231,57,52)" fg:x="106317" fg:w="927"/><text x="84.2897%" y="79.50"></text></g><g><title>core::num::nonzero::NonZero&lt;u16&gt;::new (32 samples, 0.03%)</title><rect x="86.2499%" y="165" width="0.0253%" height="15" fill="rgb(248,177,22)" fg:x="109113" fg:w="32"/><text x="86.4999%" y="175.50"></text></g><g><title>&lt;hashbrown::raw::bitmask::BitMaskIter as core::iter::traits::iterator::Iterator&gt;::next (35 samples, 0.03%)</title><rect x="86.2499%" y="197" width="0.0277%" height="15" fill="rgb(215,211,37)" fg:x="109113" fg:w="35"/><text x="86.4999%" y="207.50"></text></g><g><title>hashbrown::raw::bitmask::BitMask::lowest_set_bit (35 samples, 0.03%)</title><rect x="86.2499%" y="181" width="0.0277%" height="15" fill="rgb(241,128,51)" fg:x="109113" fg:w="35"/><text x="86.4999%" y="191.50"></text></g><g><title>hashbrown::raw::RawTable&lt;T,A&gt;::bucket (547 samples, 0.43%)</title><rect x="86.2783%" y="181" width="0.4324%" height="15" fill="rgb(227,165,31)" fg:x="109149" fg:w="547"/><text x="86.5283%" y="191.50"></text></g><g><title>hashbrown::raw::Bucket&lt;T&gt;::from_base_index (547 samples, 0.43%)</title><rect x="86.2783%" y="165" width="0.4324%" height="15" fill="rgb(228,167,24)" fg:x="109149" fg:w="547"/><text x="86.5283%" y="175.50"></text></g><g><title>core::ptr::mut_ptr::&lt;impl *mut T&gt;::sub (547 samples, 0.43%)</title><rect x="86.2783%" y="149" width="0.4324%" height="15" fill="rgb(228,143,12)" fg:x="109149" fg:w="547"/><text x="86.5283%" y="159.50"></text></g><g><title>core::ptr::mut_ptr::&lt;impl *mut T&gt;::offset (277 samples, 0.22%)</title><rect x="86.4918%" y="133" width="0.2190%" height="15" fill="rgb(249,149,8)" fg:x="109419" fg:w="277"/><text x="86.7418%" y="143.50"></text></g><g><title>hashbrown::raw::RawTable&lt;T,A&gt;::find::_{{closure}} (9,752 samples, 7.71%)</title><rect x="86.2775%" y="197" width="7.7086%" height="15" fill="rgb(243,35,44)" fg:x="109148" fg:w="9752"/><text x="86.5275%" y="207.50">hashbrown::..</text></g><g><title>hashbrown::rustc_entry::_&lt;impl hashbrown::map::HashMap&lt;K,V,S,A&gt;&gt;::rustc_entry::_{{closure}} (9,204 samples, 7.28%)</title><rect x="86.7107%" y="181" width="7.2754%" height="15" fill="rgb(246,89,9)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="191.50">hashbrown:..</text></g><g><title>&lt;alloc::string::String as core::cmp::PartialEq&gt;::eq (9,204 samples, 7.28%)</title><rect x="86.7107%" y="165" width="7.2754%" height="15" fill="rgb(233,213,13)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="175.50">&lt;alloc::st..</text></g><g><title>alloc::vec::partial_eq::&lt;impl core::cmp::PartialEq&lt;alloc::vec::Vec&lt;U,A2&gt;&gt; for alloc::vec::Vec&lt;T,A1&gt;&gt;::eq (9,204 samples, 7.28%)</title><rect x="86.7107%" y="149" width="7.2754%" height="15" fill="rgb(233,141,41)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="159.50">alloc::vec..</text></g><g><title>core::slice::cmp::&lt;impl core::cmp::PartialEq&lt;[B]&gt; for [A]&gt;::eq (9,204 samples, 7.28%)</title><rect x="86.7107%" y="133" width="7.2754%" height="15" fill="rgb(239,167,4)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="143.50">core::slic..</text></g><g><title>&lt;[A] as core::slice::cmp::SlicePartialEq&lt;B&gt;&gt;::equal (9,204 samples, 7.28%)</title><rect x="86.7107%" y="117" width="7.2754%" height="15" fill="rgb(209,217,16)" fg:x="109696" fg:w="9204"/><text x="86.9607%" y="127.50">&lt;[A] as co..</text></g><g><title>[libc.so.6] (6,225 samples, 4.92%)</title><rect x="89.0655%" y="101" width="4.9206%" height="15" fill="rgb(219,88,35)" fg:x="112675" fg:w="6225"/><text x="89.3155%" y="111.50">[libc...</text></g><g><title>hashbrown::raw::h2 (1,988 samples, 1.57%)</title><rect x="93.9862%" y="197" width="1.5714%" height="15" fill="rgb(220,193,23)" fg:x="118900" fg:w="1988"/><text x="94.2362%" y="207.50"></text></g><g><title>hashbrown::raw::sse2::Group::load (87 samples, 0.07%)</title><rect x="95.5576%" y="197" width="0.0688%" height="15" fill="rgb(230,90,52)" fg:x="120888" fg:w="87"/><text x="95.8076%" y="207.50"></text></g><g><title>core::core_arch::x86::sse2::_mm_loadu_si128 (87 samples, 0.07%)</title><rect x="95.5576%" y="181" width="0.0688%" height="15" fill="rgb(252,106,19)" fg:x="120888" fg:w="87"/><text x="95.8076%" y="191.50"></text></g><g><title>hashbrown::rustc_entry::&lt;impl hashbrown::map::HashMap&lt;K,V,S,A&gt;&gt;::rustc_entry 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y="367.50">std::rt::lang_start_internal</text></g><g><title>std::rt::lang_start::_{{closure}} (126,501 samples, 99.99%)</title><rect x="0.0055%" y="341" width="99.9945%" height="15" fill="rgb(213,87,29)" fg:x="7" fg:w="126501"/><text x="0.2555%" y="351.50">std::rt::lang_start::_{{closure}}</text></g><g><title>std::sys_common::backtrace::__rust_begin_short_backtrace (126,501 samples, 99.99%)</title><rect x="0.0055%" y="325" width="99.9945%" height="15" fill="rgb(205,151,52)" fg:x="7" fg:w="126501"/><text x="0.2555%" y="335.50">std::sys_common::backtrace::__rust_begin_short_backtrace</text></g><g><title>core::ops::function::FnOnce::call_once (126,501 samples, 99.99%)</title><rect x="0.0055%" y="309" width="99.9945%" height="15" fill="rgb(253,215,39)" fg:x="7" fg:w="126501"/><text x="0.2555%" y="319.50">core::ops::function::FnOnce::call_once</text></g><g><title>rust_1brc::main (126,501 samples, 99.99%)</title><rect x="0.0055%" y="293" width="99.9945%" height="15" fill="rgb(221,220,41)" 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\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 90cc7a6..fa089c3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,10 +23,10 @@ struct StationValues {
 }
 
 fn read_line(data: String) -> (String, f32) {
-    let parts: Vec<&str> = data.split(';').collect();
-    let station_name = parts[0].to_string();
-    let value = parts[1].parse::<f32>().expect("Failed to parse value");
-    (station_name, value)
+    let mut parts = data.split(';');
+    let station_name = parts.next().expect("Failed to parse station name");
+    let value = parts.next().expect("Failed to parse value string").parse::<f32>().expect("Failed to parse value");
+    (station_name.to_owned(), value)
 }
 
 // Calculate the station values