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process: improve nextTick() performance
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PR-URL: #13446
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
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@mscdex @addaleax
mscdex authored and addaleax committed Jul 11, 2017
1 parent b733d60 commit 586ca73
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Showing 3 changed files with 97 additions and 45 deletions.
2 changes: 1 addition & 1 deletion benchmark/process/next-tick-depth-args.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

var common = require('../common.js');
var bench = common.createBenchmark(main, {
millions: [2]
millions: [12]
});

process.maxTickDepth = Infinity;
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2 changes: 1 addition & 1 deletion benchmark/process/next-tick-depth.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
'use strict';
var common = require('../common.js');
var bench = common.createBenchmark(main, {
millions: [2]
millions: [12]
});

process.maxTickDepth = Infinity;
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138 changes: 95 additions & 43 deletions lib/internal/process/next_tick.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,42 @@ exports.setup = setupNextTick;
// Will be overwritten when setupNextTick() is called.
exports.nextTick = null;

class NextTickQueue {
constructor() {
this.head = null;
this.tail = null;
this.length = 0;
}

push(v) {
const entry = { data: v, next: null };
if (this.length > 0)
this.tail.next = entry;
else
this.head = entry;
this.tail = entry;
++this.length;
}

shift() {
if (this.length === 0)
return;
const ret = this.head.data;
if (this.length === 1)
this.head = this.tail = null;
else
this.head = this.head.next;
--this.length;
return ret;
}

clear() {
this.head = null;
this.tail = null;
this.length = 0;
}
}

function setupNextTick() {
const async_wrap = process.binding('async_wrap');
const async_hooks = require('async_hooks');
Expand All @@ -27,7 +63,7 @@ function setupNextTick() {
const { kInit, kBefore, kAfter, kDestroy, kAsyncUidCntr, kInitTriggerId } =
async_wrap.constants;
const { async_id_symbol, trigger_id_symbol } = async_wrap;
var nextTickQueue = [];
var nextTickQueue = new NextTickQueue();
var microtasksScheduled = false;

// Used to run V8's micro task queue.
Expand Down Expand Up @@ -55,27 +91,29 @@ function setupNextTick() {
function tickDone() {
if (tickInfo[kLength] !== 0) {
if (tickInfo[kLength] <= tickInfo[kIndex]) {
nextTickQueue = [];
nextTickQueue.clear();
tickInfo[kLength] = 0;
} else {
nextTickQueue.splice(0, tickInfo[kIndex]);
tickInfo[kLength] = nextTickQueue.length;
}
}
tickInfo[kIndex] = 0;
}

const microTasksTickObject = {
callback: runMicrotasksCallback,
args: undefined,
domain: null,
[async_id_symbol]: 0,
[trigger_id_symbol]: 0
};
function scheduleMicrotasks() {
if (microtasksScheduled)
return;

const tickObject =
new TickObject(runMicrotasksCallback, undefined, null);
// For the moment all microtasks come from the void until the PromiseHook
// API is implemented.
tickObject[async_id_symbol] = 0;
tickObject[trigger_id_symbol] = 0;
nextTickQueue.push(tickObject);
nextTickQueue.push(microTasksTickObject);

tickInfo[kLength]++;
microtasksScheduled = true;
Expand All @@ -86,8 +124,9 @@ function setupNextTick() {
_runMicrotasks();

if (tickInfo[kIndex] < tickInfo[kLength] ||
emitPendingUnhandledRejections())
emitPendingUnhandledRejections()) {
scheduleMicrotasks();
}
}

function _combinedTickCallback(args, callback) {
Expand Down Expand Up @@ -133,7 +172,8 @@ function setupNextTick() {
function _tickCallback() {
do {
while (tickInfo[kIndex] < tickInfo[kLength]) {
const tock = nextTickQueue[tickInfo[kIndex]++];
++tickInfo[kIndex];
const tock = nextTickQueue.shift();
const callback = tock.callback;
const args = tock.args;

Expand Down Expand Up @@ -174,7 +214,8 @@ function setupNextTick() {
function _tickDomainCallback() {
do {
while (tickInfo[kIndex] < tickInfo[kLength]) {
const tock = nextTickQueue[tickInfo[kIndex]++];
++tickInfo[kIndex];
const tock = nextTickQueue.shift();
const callback = tock.callback;
const domain = tock.domain;
const args = tock.args;
Expand Down Expand Up @@ -210,45 +251,48 @@ function setupNextTick() {
} while (tickInfo[kLength] !== 0);
}

function TickObject(callback, args, domain) {
this.callback = callback;
this.domain = domain;
this.args = args;
this[async_id_symbol] = -1;
this[trigger_id_symbol] = -1;
}

function setupInit(tickObject, triggerAsyncId) {
tickObject[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
tickObject[trigger_id_symbol] = triggerAsyncId || initTriggerId();
if (async_hook_fields[kInit] > 0) {
emitInit(tickObject[async_id_symbol],
'TickObject',
tickObject[trigger_id_symbol],
tickObject);
class TickObject {
constructor(callback, args, asyncId, triggerAsyncId) {
this.callback = callback;
this.args = args;
this.domain = process.domain || null;
this[async_id_symbol] = asyncId;
this[trigger_id_symbol] = triggerAsyncId;
}
}

// `nextTick()` will not enqueue any callback when the process is about to
// exit since the callback would not have a chance to be executed.
function nextTick(callback) {
if (typeof callback !== 'function')
throw new errors.TypeError('ERR_INVALID_CALLBACK');
// on the way out, don't bother. it won't get fired anyway.

if (process._exiting)
return;

var args;
if (arguments.length > 1) {
args = new Array(arguments.length - 1);
for (var i = 1; i < arguments.length; i++)
args[i - 1] = arguments[i];
switch (arguments.length) {
case 1: break;
case 2: args = [arguments[1]]; break;
case 3: args = [arguments[1], arguments[2]]; break;
case 4: args = [arguments[1], arguments[2], arguments[3]]; break;
default:
args = new Array(arguments.length - 1);
for (var i = 1; i < arguments.length; i++)
args[i - 1] = arguments[i];
}

var obj = new TickObject(callback, args, process.domain || null);
setupInit(obj, null);
const asyncId = ++async_uid_fields[kAsyncUidCntr];
const triggerAsyncId = initTriggerId();
const obj = new TickObject(callback, args, asyncId, triggerAsyncId);
nextTickQueue.push(obj);
tickInfo[kLength]++;
++tickInfo[kLength];
if (async_hook_fields[kInit] > 0)
emitInit(asyncId, 'TickObject', triggerAsyncId, obj);
}

// `internalNextTick()` will not enqueue any callback when the process is
// about to exit since the callback would not have a chance to be executed.
function internalNextTick(triggerAsyncId, callback) {
if (typeof callback !== 'function')
throw new TypeError('callback is not a function');
Expand All @@ -259,17 +303,25 @@ function setupNextTick() {
return;

var args;
if (arguments.length > 2) {
args = new Array(arguments.length - 2);
for (var i = 2; i < arguments.length; i++)
args[i - 2] = arguments[i];
switch (arguments.length) {
case 2: break;
case 3: args = [arguments[2]]; break;
case 4: args = [arguments[2], arguments[3]]; break;
case 5: args = [arguments[2], arguments[3], arguments[4]]; break;
default:
args = new Array(arguments.length - 2);
for (var i = 2; i < arguments.length; i++)
args[i - 2] = arguments[i];
}

var obj = new TickObject(callback, args, process.domain || null);
setupInit(obj, triggerAsyncId);
const asyncId = ++async_uid_fields[kAsyncUidCntr];
const obj = new TickObject(callback, args, asyncId, triggerAsyncId);
nextTickQueue.push(obj);
++tickInfo[kLength];
if (async_hook_fields[kInit] > 0)
emitInit(asyncId, 'TickObject', triggerAsyncId, obj);

// The call to initTriggerId() was skipped, so clear kInitTriggerId.
async_uid_fields[kInitTriggerId] = 0;
nextTickQueue.push(obj);
tickInfo[kLength]++;
}
}

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