use meta data in crox events to be able to merge multiple logs

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## Unreleased
 ### Added
 - `flamegraph`: new tool that uses the `inferno` crate to generate flamegraph svg files ([GH-73])
+- `crox`: Added the `--dir` parameter to merge all events files in dir in to one trace file ([GH-84])
+- `crox`: Added possibility to add multiple `file_prefix` parameters to merge all them to one trace file ([GH-84])
 
 ### Changed
 - `measureme`: Events are recorded in a more compact format ([GH-76])
@@ -47,3 +49,4 @@
 [GH-70]: https://github.com/rust-lang/measureme/pull/70
 [GH-73]: https://github.com/rust-lang/measureme/pull/73
 [GH-76]: https://github.com/rust-lang/measureme/pull/76
+[GH-84]: https://github.com/rust-lang/measureme/pull/84

analyzeme/Cargo.toml

@@ -8,3 +8,5 @@ license = "MIT OR Apache-2.0"
 [dependencies]
 measureme = { path = "../measureme" }
 rustc-hash = "1.0.1"
+serde = { version = "1.0", features = [ "derive" ] }
+serde_json = "1.0"

analyzeme/src/profiling_data.rs

@@ -5,18 +5,38 @@ use measureme::file_header::{
 };
 use measureme::ByteVecSink;
 use measureme::{ProfilerFiles, RawEvent, SerializationSink, StringTable, StringTableBuilder};
+use serde::{Deserialize, Deserializer};
 use std::error::Error;
 use std::fs;
 use std::mem;
 use std::path::Path;
 use std::sync::Arc;
-use std::time::SystemTime;
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 const RAW_EVENT_SIZE: usize = mem::size_of::<RawEvent>();
 
+fn system_time_from_nanos<'de, D>(deserializer: D) -> Result<SystemTime, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let duration_from_epoch = Duration::from_nanos(u64::deserialize(deserializer)?);
+    Ok(UNIX_EPOCH
+        .checked_add(duration_from_epoch)
+        .expect("a time that can be represented as SystemTime"))
+}
+
+#[derive(Deserialize)]
+pub struct Metadata {
+    #[serde(deserialize_with = "system_time_from_nanos")]
+    pub start_time: SystemTime,
+    pub process_id: u32,
+    pub cmd: String,
+}
+
 pub struct ProfilingData {
     event_data: Vec<u8>,
     string_table: StringTable,
+    pub metadata: Metadata,
 }
 
 impl ProfilingData {
@@ -39,9 +59,13 @@ impl ProfilingData {
 
         let string_table = StringTable::new(string_data, index_data)?;
 
+        let metadata = string_table.get_metadata().to_string();
+        let metadata: Metadata = serde_json::from_str(&metadata)?;
+
         Ok(ProfilingData {
             string_table,
             event_data,
+            metadata,
         })
     }
 
@@ -88,8 +112,7 @@ impl<'a> ProfilerEventIterator<'a> {
 
         let string_table = &self.data.string_table;
 
-        // FIXME: Lots of Rust code compiled in the seventies apparently.
-        let timestamp = Timestamp::from_raw_event(&raw_event, SystemTime::UNIX_EPOCH);
+        let timestamp = Timestamp::from_raw_event(&raw_event, self.data.metadata.start_time);
 
         Event {
             event_kind: string_table.get(raw_event.event_kind).to_string(),
@@ -240,10 +263,16 @@ impl ProfilingDataBuilder {
             CURRENT_FILE_FORMAT_VERSION
         );
         let string_table = StringTable::new(data_bytes, index_bytes).unwrap();
+        let metadata = Metadata {
+            start_time: UNIX_EPOCH,
+            process_id: 0,
+            cmd: "test cmd".to_string(),
+        };
 
         ProfilingData {
             event_data,
             string_table,
+            metadata,
         }
     }
 

crox/src/main.rs

@@ -2,12 +2,13 @@ use rustc_hash::FxHashMap;
 use std::fs;
 use std::io::BufWriter;
 use std::path::PathBuf;
-use std::time::Duration;
-use std::time::SystemTime;
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 use analyzeme::{ProfilingData, Timestamp};
 
+use serde::ser::SerializeSeq;
 use serde::{Serialize, Serializer};
+use serde_json::json;
 use std::cmp;
 use structopt::StructOpt;
 
@@ -43,7 +44,11 @@ struct Event {
 
 #[derive(StructOpt, Debug)]
 struct Opt {
-    file_prefix: PathBuf,
+    #[structopt(required_unless = "dir")]
+    file_prefix: Vec<PathBuf>,
+    /// all event trace files in dir will be merged to one chrome_profiler.json file
+    #[structopt(long = "dir")]
+    dir: Option<PathBuf>,
     /// collapse threads without overlapping events
     #[structopt(long = "collapse-threads")]
     collapse_threads: bool,
@@ -114,53 +119,98 @@ fn generate_thread_to_collapsed_thread_mapping(
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let opt = Opt::from_args();
 
-    let data = ProfilingData::new(&opt.file_prefix)?;
-
     let chrome_file = BufWriter::new(fs::File::create("chrome_profiler.json")?);
+    let mut serializer = serde_json::Serializer::new(chrome_file);
 
-    //find the earlier timestamp (it should be the first event)
-    //subtract one tick so that the start of the event shows in Chrome
-    let first_event_timestamp = make_start_timestamp(&data);
+    let mut seq = serializer.serialize_seq(None)?;
 
-    let mut serializer = serde_json::Serializer::new(chrome_file);
-    let thread_to_collapsed_thread = generate_thread_to_collapsed_thread_mapping(&opt, &data);
-    let mut event_iterator = data.iter();
-
-    //create an iterator so we can avoid allocating a Vec with every Event for serialization
-    let json_event_iterator = std::iter::from_fn(|| {
-        while let Some(event) = event_iterator.next() {
-            // Chrome does not seem to like how many QueryCacheHit events we generate
-            // only handle startStop events for now
-            if let Timestamp::Interval { start, end } = event.timestamp {
-                let duration = end.duration_since(start).unwrap();
-                if let Some(minimum_duration) = opt.minimum_duration {
-                    if duration.as_micros() < minimum_duration {
-                        continue;
-                    }
+    let dir_paths = file_prefixes_in_dir(&opt)?;
+
+    for file_prefix in opt.file_prefix.iter().chain(dir_paths.iter()) {
+        let data = ProfilingData::new(&file_prefix)?;
+
+        let thread_to_collapsed_thread = generate_thread_to_collapsed_thread_mapping(&opt, &data);
+
+        // Chrome does not seem to like how many QueryCacheHit events we generate
+        // only handle Interval events for now
+        for event in data.iter().filter(|e| !e.timestamp.is_instant()) {
+            let duration = event.duration().unwrap();
+            if let Some(minimum_duration) = opt.minimum_duration {
+                if duration.as_micros() < minimum_duration {
+                    continue;
                 }
-                return Some(Event {
-                    name: event.label.clone().into_owned(),
-                    category: event.event_kind.clone().into_owned(),
-                    event_type: EventType::Complete,
-                    timestamp: start.duration_since(first_event_timestamp).unwrap(),
-                    duration,
-                    process_id: 0,
-                    thread_id: *thread_to_collapsed_thread
-                        .get(&event.thread_id)
-                        .unwrap_or(&event.thread_id),
-                    args: None,
-                });
             }
+            let crox_event = Event {
+                name: event.label.clone().into_owned(),
+                category: event.event_kind.clone().into_owned(),
+                event_type: EventType::Complete,
+                timestamp: event.timestamp.start().duration_since(UNIX_EPOCH).unwrap(),
+                duration,
+                process_id: data.metadata.process_id,
+                thread_id: *thread_to_collapsed_thread
+                    .get(&event.thread_id)
+                    .unwrap_or(&event.thread_id),
+                args: None,
+            };
+            seq.serialize_element(&crox_event)?;
         }
+        // add crate name for the process_id
+        let index_of_crate_name = data
+            .metadata
+            .cmd
+            .find(" --crate-name ")
+            .map(|index| index + 14);
+        if let Some(index) = index_of_crate_name {
+            let (_, last) = data.metadata.cmd.split_at(index);
+            let (crate_name, _) = last.split_at(last.find(" ").unwrap_or(last.len()));
+
+            let process_name = json!({
+                "name": "process_name",
+                "ph" : "M",
+                "ts" : 0,
+                "tid" : 0,
+                "cat" : "",
+                "pid" : data.metadata.process_id,
+                "args": {
+                    "name" : crate_name
+                }
+            });
+            seq.serialize_element(&process_name)?;
+        }
+        // sort the processes after start time
+        let process_name = json!({
+            "name": "process_sort_index",
+            "ph" : "M",
+            "ts" : 0,
+            "tid" : 0,
+            "cat" : "",
+            "pid" : data.metadata.process_id,
+            "args": {
+                "sort_index" : data.metadata.start_time.duration_since(UNIX_EPOCH).unwrap().as_micros() as u64
+            }
+        });
+        seq.serialize_element(&process_name)?;
+    }
 
-        None
-    });
-
-    serializer.collect_seq(json_event_iterator)?;
+    seq.end()?;
 
     Ok(())
 }
 
+fn file_prefixes_in_dir(opt: &Opt) -> Result<Vec<PathBuf>, std::io::Error> {
+    let mut result = Vec::new();
+    if let Some(dir_path) = &opt.dir {
+        for entry in fs::read_dir(dir_path)? {
+            let entry = entry?;
+            let path = entry.path();
+            if path.extension().filter(|e| *e == "events").is_some() {
+                result.push(path)
+            }
+        }
+    }
+    Ok(result)
+}
+
 fn timestamp_to_min_max(timestamp: Timestamp) -> (SystemTime, SystemTime) {
     match timestamp {
         Timestamp::Instant(t) => (t, t),
@@ -171,22 +221,3 @@ fn timestamp_to_min_max(timestamp: Timestamp) -> (SystemTime, SystemTime) {
         }
     }
 }
-
-// FIXME: Move this to `ProfilingData` and base it on the `start_time` field
-//        from metadata.
-fn make_start_timestamp(data: &ProfilingData) -> SystemTime {
-    // We cannot assume the first event in the stream actually is the first
-    // event because interval events are emitted at their end. So in theory it
-    // is possible that the event with the earliest starting time is the last
-    // event in the stream (i.e. if there is an interval event that spans the
-    // entire execution of the profile).
-    //
-    // Let's be on the safe side and iterate the whole stream.
-    let min = data
-        .iter()
-        .map(|e| timestamp_to_min_max(e.timestamp).0)
-        .min()
-        .unwrap();
-
-    min - Duration::from_micros(1)
-}

measureme/src/stringtable.rs

@@ -295,6 +295,10 @@ impl StringTable {
     pub fn get<'a>(&'a self, id: StringId) -> StringRef<'a> {
         StringRef { id, table: self }
     }
+    pub fn get_metadata<'a>(&'a self) -> StringRef<'a> {
+        let id = StringId(METADATA_STRING_ID);
+        self.get(id)
+    }
 }
 
 #[cfg(test)]