1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
'use strict';
const common = require('../common');
const { performance } = require('perf_hooks');
// Get the start time as soon as possible.
const testStartTime = performance.now();
const assert = require('assert');
const { writeSync } = require('fs');
// Use writeSync to stdout to avoid disturbing the loop.
function log(str) {
writeSync(1, str + '\n');
}
assert(performance);
assert(performance.nodeTiming);
assert.strictEqual(typeof performance.timeOrigin, 'number');
assert(testStartTime > 0, `${testStartTime} <= 0`);
// Use a fairly large epsilon value, since we can only guarantee that the node
// process started up in 15 seconds.
assert(testStartTime < 15000, `${testStartTime} >= 15000`);
// Use different ways to calculate process uptime to check that
// performance.timeOrigin and performance.now() are in reasonable range.
const epsilon = 50;
{
const uptime1 = Date.now() - performance.timeOrigin;
const uptime2 = performance.now();
const uptime3 = process.uptime() * 1000;
assert(Math.abs(uptime1 - uptime2) < epsilon,
`Date.now() - performance.timeOrigin (${uptime1}) - ` +
`performance.now() (${uptime2}) = ` +
`${uptime1 - uptime2} >= +- ${epsilon}`);
assert(Math.abs(uptime1 - uptime3) < epsilon,
`Date.now() - performance.timeOrigin (${uptime1}) - ` +
`process.uptime() * 1000 (${uptime3}) = ` +
`${uptime1 - uptime3} >= +- ${epsilon}`);
}
assert.strictEqual(performance.nodeTiming.name, 'node');
assert.strictEqual(performance.nodeTiming.entryType, 'node');
// If timing.duration gets copied into the argument instead of being computed
// via the getter, this should be called right after timing is created.
function checkNodeTiming(timing) {
// Calculate the difference between now() and duration as soon as possible.
const now = performance.now();
const delta = Math.abs(now - timing.duration);
log(JSON.stringify(timing, null, 2));
// Check that the properties are still reasonable.
assert.strictEqual(timing.name, 'node');
assert.strictEqual(timing.entryType, 'node');
// Check that duration is positive and practically the same as
// performance.now() i.e. measures Node.js instance up time.
assert.strictEqual(typeof timing.duration, 'number');
assert(timing.duration > 0, `timing.duration ${timing.duration} <= 0`);
assert(delta < 10,
`now (${now}) - timing.duration (${timing.duration}) = ${delta} >= ${10}`);
// Check that the following fields do not change.
assert.strictEqual(timing.startTime, initialTiming.startTime);
assert.strictEqual(timing.nodeStart, initialTiming.nodeStart);
assert.strictEqual(timing.v8Start, initialTiming.v8Start);
assert.strictEqual(timing.environment, initialTiming.environment);
assert.strictEqual(timing.bootstrapComplete, initialTiming.bootstrapComplete);
assert.strictEqual(typeof timing.loopStart, 'number');
assert.strictEqual(typeof timing.loopExit, 'number');
}
log('check initial nodeTiming');
// Copy all the values from the getters.
const initialTiming = { ...performance.nodeTiming };
checkNodeTiming(initialTiming);
{
const {
startTime,
nodeStart,
v8Start,
environment,
bootstrapComplete,
} = initialTiming;
assert.strictEqual(startTime, 0);
assert.strictEqual(typeof nodeStart, 'number');
assert(nodeStart > 0, `nodeStart ${nodeStart} <= 0`);
// The whole process starts before this test starts.
assert(nodeStart < testStartTime,
`nodeStart ${nodeStart} >= ${testStartTime}`);
assert.strictEqual(typeof v8Start, 'number');
assert(v8Start > 0, `v8Start ${v8Start} <= 0`);
// V8 starts after the process starts.
assert(v8Start > nodeStart, `v8Start ${v8Start} <= ${nodeStart}`);
// V8 starts before this test starts.
assert(v8Start < testStartTime,
`v8Start ${v8Start} >= ${testStartTime}`);
assert.strictEqual(typeof environment, 'number');
assert(environment > 0, `environment ${environment} <= 0`);
// Environment starts after V8 starts.
assert(environment > v8Start,
`environment ${environment} <= ${v8Start}`);
// Environment starts before this test starts.
assert(environment < testStartTime,
`environment ${environment} >= ${testStartTime}`);
assert.strictEqual(typeof bootstrapComplete, 'number');
assert(bootstrapComplete > 0, `bootstrapComplete ${bootstrapComplete} <= 0`);
// Bootstrap completes after environment starts.
assert(bootstrapComplete > environment,
`bootstrapComplete ${bootstrapComplete} <= ${environment}`);
// Bootstrap completes before this test starts.
assert(bootstrapComplete < testStartTime,
`bootstrapComplete ${bootstrapComplete} >= ${testStartTime}`);
}
assert.strictEqual(initialTiming.loopExit, -1);
function checkValue(timing, name, min, max) {
const value = timing[name];
assert(value > 0, `${name} ${value} <= 0`);
// Loop starts after bootstrap completes.
assert(value > min,
`${name} ${value} <= ${min}`);
assert(value < max, `${name} ${value} >= ${max}`);
}
let loopStart = initialTiming.loopStart;
if (common.isMainThread) {
// In the main thread, the loop does not start until we start an operation
// that requires it, e.g. setTimeout().
assert.strictEqual(initialTiming.loopStart, -1);
log('Start timer');
setTimeout(() => {
log('Check nodeTiming in timer');
const timing = { ...performance.nodeTiming };
checkNodeTiming(timing);
// Loop should start after we fire the timeout, and before we call
// performance.now() here.
loopStart = timing.loopStart;
checkValue(timing, 'loopStart', initialTiming.duration, performance.now());
}, 1000);
} else {
// In the worker, the loop always starts before the user code is evaluated,
// and after bootstrap completes.
checkValue(initialTiming,
'loopStart',
initialTiming.bootstrapComplete,
testStartTime);
}
process.on('exit', () => {
log('Check nodeTiming in process exit event');
const timing = { ...performance.nodeTiming };
checkNodeTiming(timing);
// Check that loopStart does not change.
assert.strictEqual(timing.loopStart, loopStart);
checkValue(timing,
'loopExit',
loopStart,
performance.now());
});
|
