node/test/parallel/test-timers-linked-list.js
Andras 6f75b6672c timers: optimize setImmediate()
Save the setImmediate() callback arguments into an array instead of a
closure, and invoke the callback on the arguments from an optimizable
function.

  60% faster setImmediate with 0 args (15% if self-recursive)
  4x faster setImmediate with 1-3 args, 2x with > 3
  seems to be faster with less memory pressure when memory is tight

Changes:
- use L.create() to build faster lists
- use runCallback() from within tryOnImmediate()
- save the arguments and do not build closures for the callbacks

PR-URL: https://github.com/nodejs/node/pull/6436
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
2016-06-29 11:02:25 +02:00

111 lines
2.1 KiB
JavaScript

'use strict';
// Flags: --expose-internals
require('../common');
const assert = require('assert');
const L = require('_linklist'); // eslint-disable-line no-restricted-modules
const internalL = require('internal/linkedlist');
assert.strictEqual(L, internalL);
var list = { name: 'list' };
var A = { name: 'A' };
var B = { name: 'B' };
var C = { name: 'C' };
var D = { name: 'D' };
L.init(list);
L.init(A);
L.init(B);
L.init(C);
L.init(D);
assert.ok(L.isEmpty(list));
assert.equal(null, L.peek(list));
L.append(list, A);
// list -> A
assert.equal(A, L.peek(list));
L.append(list, B);
// list -> A -> B
assert.equal(A, L.peek(list));
L.append(list, C);
// list -> A -> B -> C
assert.equal(A, L.peek(list));
L.append(list, D);
// list -> A -> B -> C -> D
assert.equal(A, L.peek(list));
var x = L.shift(list);
assert.equal(A, x);
// list -> B -> C -> D
assert.equal(B, L.peek(list));
x = L.shift(list);
assert.equal(B, x);
// list -> C -> D
assert.equal(C, L.peek(list));
// B is already removed, so removing it again shouldn't hurt.
L.remove(B);
// list -> C -> D
assert.equal(C, L.peek(list));
// Put B back on the list
L.append(list, B);
// list -> C -> D -> B
assert.equal(C, L.peek(list));
L.remove(C);
// list -> D -> B
assert.equal(D, L.peek(list));
L.remove(B);
// list -> D
assert.equal(D, L.peek(list));
L.remove(D);
// list
assert.equal(null, L.peek(list));
assert.ok(L.isEmpty(list));
L.append(list, D);
// list -> D
assert.equal(D, L.peek(list));
L.append(list, C);
L.append(list, B);
L.append(list, A);
// list -> D -> C -> B -> A
// Append should REMOVE C from the list and append it to the end.
L.append(list, C);
// list -> D -> B -> A -> C
assert.equal(D, L.shift(list));
// list -> B -> A -> C
assert.equal(B, L.peek(list));
assert.equal(B, L.shift(list));
// list -> A -> C
assert.equal(A, L.peek(list));
assert.equal(A, L.shift(list));
// list -> C
assert.equal(C, L.peek(list));
assert.equal(C, L.shift(list));
// list
assert.ok(L.isEmpty(list));
const list2 = L.create();
const list3 = L.create();
assert.ok(L.isEmpty(list2));
assert.ok(L.isEmpty(list3));
assert.ok(list2 != list3);