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Optimize child_process IPC for large data #10557

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Optimize child_process IPC for large data #10557

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b506f72
child_process: fix IPC bench to obey send() ret val
ypresto Dec 31, 2016
4b13964
child_process: stop indexOf() on whole IPC buffer
ypresto Dec 31, 2016
ccac4b4
child_process: get rid of forEach() and slice() in IPC
ypresto Dec 31, 2016
58f6cc0
child_process: fix IPC benchmark message has two more bytes
ypresto Jan 1, 2017
de82d97
child_process: get rid of another forEach() in IPC
ypresto Jan 1, 2017
f466ac7
child_process: use setImmediate for IPC bench
ypresto Jan 1, 2017
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17 changes: 11 additions & 6 deletions benchmark/child_process/child-process-read-ipc.js
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Expand Up @@ -2,13 +2,19 @@
if (process.argv[2] === 'child') {
const len = +process.argv[3];
const msg = `"${'.'.repeat(len)}"`;
while (true) {
process.send(msg);
}
const send = () => {
while (process.send(msg));
// Wait: backlog of unsent messages exceeds threshold
setTimeout(send, 20);
};
send();
} else {
const common = require('../common.js');
const bench = common.createBenchmark(main, {
len: [64, 256, 1024, 4096, 32768],
len: [
64, 256, 1024, 4096, 16384, 65536,
65536 << 4, 65536 << 8
],
dur: [5]
});
const spawn = require('child_process').spawn;
Expand All @@ -29,8 +35,7 @@ if (process.argv[2] === 'child') {

setTimeout(function() {
child.kill();
const gbits = (bytes * 8) / (1024 * 1024 * 1024);
bench.end(gbits);
bench.end(bytes);
}, dur * 1000);
}
}
24 changes: 14 additions & 10 deletions lib/internal/child_process.js
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Expand Up @@ -446,13 +446,19 @@ function setupChannel(target, channel) {
channel.onread = function(nread, pool, recvHandle) {
// TODO(bnoordhuis) Check that nread > 0.
if (pool) {
jsonBuffer += decoder.write(pool);

var i, start = 0;
// Linebreak is used as a message end sign
var lines = decoder.write(pool).split('\n');
var chunks = lines.slice(0, -1);
// Last line does not have trailing linebreak
var incompleteChunk = lines[lines.length - 1];
if (chunks.length === 0) {
jsonBuffer += incompleteChunk;
this.buffering = jsonBuffer.length !== 0;
return;
}
chunks[0] = jsonBuffer + chunks[0];

//Linebreak is used as a message end sign
while ((i = jsonBuffer.indexOf('\n', start)) >= 0) {
var json = jsonBuffer.slice(start, i);
chunks.forEach(function(json) {
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forEach() is slower than a normal for loop.

var message = JSON.parse(json);

// There will be at most one NODE_HANDLE message in every chunk we
Expand All @@ -462,10 +468,8 @@ function setupChannel(target, channel) {
handleMessage(target, message, recvHandle);
else
handleMessage(target, message, undefined);

start = i + 1;
}
jsonBuffer = jsonBuffer.slice(start);
});
jsonBuffer = incompleteChunk;
this.buffering = jsonBuffer.length !== 0;

} else {
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