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child_process: measure buffer length in bytes
This change fixes a known issue where `maxBuffer` limits by characters rather than bytes. Benchmark added to confirm no performance regression occurs with this change. PR-URL: nodejs#6764 Fixes: nodejs#1901 Reviewed-By: Brian White <mscdex@mscdex.net>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,30 @@ | ||
'use strict'; | ||
const common = require('../common.js'); | ||
const bench = common.createBenchmark(main, { | ||
len: [64, 256, 1024, 4096, 32768], | ||
dur: [5] | ||
}); | ||
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const exec = require('child_process').exec; | ||
function main(conf) { | ||
bench.start(); | ||
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const dur = +conf.dur; | ||
const len = +conf.len; | ||
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const msg = `"${'.'.repeat(len)}"`; | ||
msg.match(/./); | ||
const options = {'stdio': ['ignore', 'pipe', 'ignore']}; | ||
// NOTE: Command below assumes bash shell. | ||
const child = exec(`while\n echo ${msg}\ndo :; done\n`, options); | ||
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var bytes = 0; | ||
child.stdout.on('data', function(msg) { | ||
bytes += msg.length; | ||
}); | ||
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setTimeout(function() { | ||
child.kill(); | ||
bench.end(bytes); | ||
}, dur * 1000); | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,15 @@ | ||
'use strict'; | ||
const common = require('../common'); | ||
const assert = require('assert'); | ||
const cp = require('child_process'); | ||
const unicode = '中文测试'; // Length = 4, Byte length = 13 | ||
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if (process.argv[2] === 'child') { | ||
console.error(unicode); | ||
} else { | ||
const cmd = `${process.execPath} ${__filename} child`; | ||
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cp.exec(cmd, {maxBuffer: 10}, common.mustCall((err, stdout, stderr) => { | ||
assert.strictEqual(err.message, 'stderr maxBuffer exceeded'); | ||
})); | ||
} |
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