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node/test/sequential/test-perf-hooks.js at main · fetchapi/node · GitHub
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node
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sequential
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test-perf-hooks.js
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node
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test-perf-hooks.js
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'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
(
)
)
;
}
)
;
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