perf_hooks: add idleTime and event loop util by trevnorris · Pull Request #34938 · nodejs/node · GitHub

Use uv_metrics_idle_time() to return a high resolution millisecond timer
of the amount of time the event loop has been idle since it was
initialized.

Include performance.eventLoopUtilization() API to handle the math of
calculating the idle and active times. This has been added to prevent
accidental miscalculations of the event loop utilization. Such as not
taking into consideration offsetting nodeTiming.loopStart or timing
differences when being called from a Worker thread.

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

On the side, is v12.x going to receive the libuv v1.39.0 update so we can backport this?

CI: https://ci.nodejs.org/job/node-test-pull-request/32946/

LGTM

Curse these timing tests. It's so hard not to make them flaky. I'll work on it.

lgtm

Force pushed a change to remove the timeout epsilon test. The other tests rely on the accumulators and shouldn't be prone to the same timing issues.

cc @nodejs/diagnostics @nodejs/performance

The failed test didn't take into consideration the timing difference if the test was executed from a Worker thread. Will fix that now.

Some minor nits, but LGTM.

@Flarna @gireeshpunathil @Qard @mcollina @juanarbol @edsadr @jasnell Thank you everyone for the prompt reviews. I request another approval and CI because I made an alteration to the API. Here are the specific changes from the last push:

eventLoopUtilization() now operates more like process.hrtime(). As in it will return the difference, instead of the totals, between the current call and the previous call. It also allows passing a second object that will perform the calculations for the user.
Documentation has been updated, along with an explanation of event loop utilization and an example of how it differs from CPU utilization.
More tests have been added. Specifically around how the calculations are performed (in case any of the nodeTiming implementation specifics are changed in the future) and whether it works correctly within Worker threads.

Notable changes: - buffer: also alias BigUInt methods (Anna Henningsen) #34960 - perf_hooks: add idleTime and event loop util (Trevor Norris) #34938 PR-URL: #35023

Notable changes: - buffer: also alias BigUInt methods (Anna Henningsen) #34960 - crypto: add randomInt function (Oli Lalonde) #34600 - perf_hooks: add idleTime and event loop util (Trevor Norris) #34938 - stream: simpler and faster Readable async iterator (Robert Nagy) #34035 - stream: save error in state (Robert Nagy) #34103 PR-URL: #35023

Notable changes: - buffer: also alias BigUInt methods (Anna Henningsen) #34960 - crypto: add randomInt function (Oli Lalonde) #34600 - perf_hooks: add idleTime and event loop util (Trevor Norris) #34938 - stream: simpler and faster Readable async iterator (Robert Nagy) #34035 - stream: save error in state (Robert Nagy) #34103 PR-URL: #35023 Conflicts: src/node_version.h

nodejs/node#34938

Use uv_metrics_idle_time() to return a high resolution millisecond timer of the amount of time the event loop has been idle since it was initialized. Include performance.eventLoopUtilization() API to handle the math of calculating the idle and active times. This has been added to prevent accidental miscalculations of the event loop utilization. Such as not taking into consideration offsetting nodeTiming.loopStart or timing differences when being called from a Worker thread. PR-URL: #34938 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Adrian Estrada <edsadr@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com> Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>

Notable changes: async_hooks: * add AsyncResource.bind utility (James M Snell) (#34574) buffer: * also alias BigUInt methods (Anna Henningsen) (#34960) * alias UInt ➡️ Uint in buffer methods (Anna Henningsen) (#34729) build: * add build flag for OSS-Fuzz integration (davkor) (#34761) cli: * add alias for report-directory to make it consistent (Ash Cripps) (#33587) crypto: * allow KeyObjects in postMessage (Tobias Nießen) (#33360) * add randomInt function (Oli Lalonde) (#34600) deps: * upgrade to libuv 1.39.0 (Colin Ihrig) (#34915) dgram: * add IPv6 scope id suffix to received udp6 dgrams (Pekka Nikander) (#14500) * allow typed arrays in .send() (Sarat Addepalli) (#22413) doc: * add basic embedding example documentation (Anna Henningsen) (#30467) embedding: * make Stop() stop Workers (Anna Henningsen) (#32531) * provide hook for custom process.exit() behaviour (Anna Henningsen) (#32531) fs: * implement lutimes (Maël Nison) (#33399) http: * return this from IncomingMessage#destroy() (Colin Ihrig) (#32789) * expose host and protocol on ClientRequest (wenningplus) [#33803](#33803) http2: * return this for Http2ServerRequest#setTimeout (Pranshu Srivastava) (#33994) * do not modify explicity set date headers (Pranshu Srivastava) (#33160) * n-api**: * support type-tagging objects (Gabriel Schulhof) (#28237) * provide asynchronous cleanup hooks (Anna Henningsen) (#34572) perf_hooks: * add idleTime and event loop util (Trevor Norris) (#34938) timers: * allow timers to be used as primitives (Denys Otrishko) [#34017](#34017) tls: * make 'createSecureContext' honor more options (Mateusz Krawczuk) (#33974) worker: * add public method for marking objects as untransferable (Anna Henningsen) (#33979) * emit `'messagerror'` events for failed deserialization (Anna Henningsen) (#33772) * allow passing JS wrapper objects via postMessage (Anna Henningsen) (#33772) * allow transferring/cloning generic BaseObjects (Anna Henningsen) (#33772) * add option to track unmanaged file descriptors (Anna Henningsen) (#34303) * add stack size resource limit option (Anna Henningsen) (#33085) * make FileHandle transferable (Anna Henningsen) (#33772) zlib: * add `maxOutputLength` option (unknown) (#33516) PR-URL: TODO

Notable changes: assert: * (SEMVER-MINOR) port common.mustCall() to assert (ConorDavenport) #31982 async_hooks: * (SEMVER-MINOR) add AsyncResource.bind utility (James M Snell) #34574 buffer: * (SEMVER-MINOR) also alias BigUInt methods (Anna Henningsen) #34960 * (SEMVER-MINOR) alias UInt ➡️ Uint in buffer methods (Anna Henningsen) #34729 build: * (SEMVER-MINOR) add build flag for OSS-Fuzz integration (davkor) #34761 cli: * (SEMVER-MINOR) add alias for report-directory to make it consistent (Ash Cripps) #33587 crypto: * (SEMVER-MINOR) allow KeyObjects in postMessage (Tobias Nießen) #33360 * (SEMVER-MINOR) add randomInt function (Oli Lalonde) #34600 deps: * upgrade to libuv 1.39.0 (Colin Ihrig) #34915 * upgrade npm to 6.14.7 (claudiahdz) #34468 * upgrade to libuv 1.38.1 (Colin Ihrig) #34187 dgram: * (SEMVER-MINOR) add IPv6 scope id suffix to received udp6 dgrams (Pekka Nikander) #14500 * (SEMVER-MINOR) allow typed arrays in .send() (Sarat Addepalli) #22413 doc: * (SEMVER-MINOR) Add maxTotalSockets option to agent constructor (rickyes) #33617 * (SEMVER-MINOR) add basic embedding example documentation (Anna Henningsen) #30467 * add Ricky Zhou to collaborators (rickyes) #34676 * add release key for Ruy Adorno (Ruy Adorno) #34628 * add DerekNonGeneric to collaborators (Derek Lewis) #34602 * add AshCripps to collaborators (Ash Cripps) #34494 * add HarshithaKP to collaborators (Harshitha K P) #34417 * add rexagod to collaborators (Pranshu Srivastava) #34457 * add release key for Richard Lau (Richard Lau) #34397 * add danielleadams to collaborators (Danielle Adams) #34360 * add sxa as collaborator (Stewart X Addison) #34338 * add ruyadorno to collaborators (Ruy Adorno) #34297 * (SEMVER-MAJOR) deprecate process.umask() with no arguments (Colin Ihrig) #32499 embedding: * (SEMVER-MINOR) make Stop() stop Workers (Anna Henningsen) #32531 * (SEMVER-MINOR) provide hook for custom process.exit() behaviour (Anna Henningsen) #32531 fs: * (SEMVER-MINOR) implement lutimes (Maël Nison) #33399 http: * (SEMVER-MINOR) add maxTotalSockets to agent class (rickyes) #33617 * (SEMVER-MINOR) return this from IncomingMessage#destroy() (Colin Ihrig) #32789 * (SEMVER-MINOR) expose host and protocol on ClientRequest (wenningplus) #33803 http2: * (SEMVER-MINOR) return this for Http2ServerRequest#setTimeout (Pranshu Srivastava) #33994 * (SEMVER-MINOR) do not modify explicity set date headers (Pranshu Srivastava) #33160 module: * (SEMVER-MINOR) named exports for CJS via static analysis (Guy Bedford) #35249 * (SEMVER-MINOR) exports pattern support (Guy Bedford) #34718 * (SEMVER-MINOR) package "imports" field (Guy Bedford) #34117 * (SEMVER-MINOR) deprecate module.parent (Antoine du HAMEL) #32217 n-api: * (SEMVER-MINOR) create N-API version 7 (Gabriel Schulhof) #35199 * (SEMVER-MINOR) support type-tagging objects (Gabriel Schulhof) #28237 n-api,src: * (SEMVER-MINOR) provide asynchronous cleanup hooks (Anna Henningsen) #34572 perf_hooks: * (SEMVER-MINOR) add idleTime and event loop util (Trevor Norris) #34938 timers: * (SEMVER-MINOR) allow timers to be used as primitives (Denys Otrishko) #34017 tls: * (SEMVER-MINOR) make 'createSecureContext' honor more options (Mateusz Krawczuk) #33974 worker: * (SEMVER-MINOR) add public method for marking objects as untransferable (Anna Henningsen) #33979 * (SEMVER-MINOR) emit `'messagerror'` events for failed deserialization (Anna Henningsen) #33772 * (SEMVER-MINOR) allow passing JS wrapper objects via postMessage (Anna Henningsen) #33772 * (SEMVER-MINOR) allow transferring/cloning generic BaseObjects (Anna Henningsen) #33772 * (SEMVER-MINOR) add option to track unmanaged file descriptors (Anna Henningsen) #34303 * (SEMVER-MINOR) add stack size resource limit option (Anna Henningsen) #33085 worker,fs: * (SEMVER-MINOR) make FileHandle transferable (Anna Henningsen) #33772 zlib: * (SEMVER-MINOR) add `maxOutputLength` option (unknown) #33516 * switch to lazy init for zlib streams (Andrey Pechkurov) #34048 PR-URL: TODO

Notable changes: assert: * (SEMVER-MINOR) port common.mustCall() to assert (ConorDavenport) #31982 async_hooks: * (SEMVER-MINOR) add AsyncResource.bind utility (James M Snell) #34574 buffer: * (SEMVER-MINOR) also alias BigUInt methods (Anna Henningsen) #34960 * (SEMVER-MINOR) alias UInt ➡️ Uint in buffer methods (Anna Henningsen) #34729 build: * (SEMVER-MINOR) add build flag for OSS-Fuzz integration (davkor) #34761 cli: * (SEMVER-MINOR) add alias for report-directory to make it consistent (Ash Cripps) #33587 crypto: * (SEMVER-MINOR) allow KeyObjects in postMessage (Tobias Nießen) #33360 * (SEMVER-MINOR) add randomInt function (Oli Lalonde) #34600 deps: * upgrade to libuv 1.39.0 (Colin Ihrig) #34915 * upgrade npm to 6.14.7 (claudiahdz) #34468 * upgrade to libuv 1.38.1 (Colin Ihrig) #34187 dgram: * (SEMVER-MINOR) add IPv6 scope id suffix to received udp6 dgrams (Pekka Nikander) #14500 * (SEMVER-MINOR) allow typed arrays in .send() (Sarat Addepalli) #22413 doc: * (SEMVER-MINOR) Add maxTotalSockets option to agent constructor (rickyes) #33617 * (SEMVER-MINOR) add basic embedding example documentation (Anna Henningsen) #30467 * add Ricky Zhou to collaborators (rickyes) #34676 * add release key for Ruy Adorno (Ruy Adorno) #34628 * add DerekNonGeneric to collaborators (Derek Lewis) #34602 * add AshCripps to collaborators (Ash Cripps) #34494 * add HarshithaKP to collaborators (Harshitha K P) #34417 * add rexagod to collaborators (Pranshu Srivastava) #34457 * add release key for Richard Lau (Richard Lau) #34397 * add danielleadams to collaborators (Danielle Adams) #34360 * add sxa as collaborator (Stewart X Addison) #34338 * add ruyadorno to collaborators (Ruy Adorno) #34297 * (SEMVER-MAJOR) deprecate process.umask() with no arguments (Colin Ihrig) #32499 embedding: * (SEMVER-MINOR) make Stop() stop Workers (Anna Henningsen) #32531 * (SEMVER-MINOR) provide hook for custom process.exit() behaviour (Anna Henningsen) #32531 fs: * (SEMVER-MINOR) implement lutimes (Maël Nison) #33399 http: * (SEMVER-MINOR) add maxTotalSockets to agent class (rickyes) #33617 * (SEMVER-MINOR) return this from IncomingMessage#destroy() (Colin Ihrig) #32789 * (SEMVER-MINOR) expose host and protocol on ClientRequest (wenningplus) #33803 http2: * (SEMVER-MINOR) return this for Http2ServerRequest#setTimeout (Pranshu Srivastava) #33994 * (SEMVER-MINOR) do not modify explicity set date headers (Pranshu Srivastava) #33160 module: * (SEMVER-MINOR) named exports for CJS via static analysis (Guy Bedford) #35249 * (SEMVER-MINOR) exports pattern support (Guy Bedford) #34718 * (SEMVER-MINOR) package "imports" field (Guy Bedford) #34117 * (SEMVER-MINOR) deprecate module.parent (Antoine du HAMEL) #32217 n-api: * (SEMVER-MINOR) create N-API version 7 (Gabriel Schulhof) #35199 * (SEMVER-MINOR) support type-tagging objects (Gabriel Schulhof) #28237 n-api,src: * (SEMVER-MINOR) provide asynchronous cleanup hooks (Anna Henningsen) #34572 perf_hooks: * (SEMVER-MINOR) add idleTime and event loop util (Trevor Norris) #34938 timers: * (SEMVER-MINOR) allow timers to be used as primitives (Denys Otrishko) #34017 tls: * (SEMVER-MINOR) make 'createSecureContext' honor more options (Mateusz Krawczuk) #33974 worker: * (SEMVER-MINOR) add public method for marking objects as untransferable (Anna Henningsen) #33979 * (SEMVER-MINOR) emit `'messagerror'` events for failed deserialization (Anna Henningsen) #33772 * (SEMVER-MINOR) allow passing JS wrapper objects via postMessage (Anna Henningsen) #33772 * (SEMVER-MINOR) allow transferring/cloning generic BaseObjects (Anna Henningsen) #33772 * (SEMVER-MINOR) add option to track unmanaged file descriptors (Anna Henningsen) #34303 * (SEMVER-MINOR) add stack size resource limit option (Anna Henningsen) #33085 worker,fs: * (SEMVER-MINOR) make FileHandle transferable (Anna Henningsen) #33772 zlib: * (SEMVER-MINOR) add `maxOutputLength` option (unknown) #33516 * switch to lazy init for zlib streams (Andrey Pechkurov) #34048 PR-URL: #35401

Add libuv's cumulative idle time in the diagnostic report. Add the data under the libuv's loop section Refs: nodejs#34938 PR-URL: nodejs#35940 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>

Add libuv's cumulative idle time in the diagnostic report. Add the data under the libuv's loop section Refs: #34938 PR-URL: #35940 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>

Notable changes: - buffer: also alias BigUInt methods (Anna Henningsen) nodejs#34960 - crypto: add randomInt function (Oli Lalonde) nodejs#34600 - perf_hooks: add idleTime and event loop util (Trevor Norris) nodejs#34938 - stream: simpler and faster Readable async iterator (Robert Nagy) nodejs#34035 - stream: save error in state (Robert Nagy) nodejs#34103 PR-URL: nodejs#35023 Conflicts: src/node_version.h

Notable changes: assert: * (SEMVER-MINOR) port common.mustCall() to assert (ConorDavenport) nodejs#31982 async_hooks: * (SEMVER-MINOR) add AsyncResource.bind utility (James M Snell) nodejs#34574 buffer: * (SEMVER-MINOR) also alias BigUInt methods (Anna Henningsen) nodejs#34960 * (SEMVER-MINOR) alias UInt ➡️ Uint in buffer methods (Anna Henningsen) nodejs#34729 build: * (SEMVER-MINOR) add build flag for OSS-Fuzz integration (davkor) nodejs#34761 cli: * (SEMVER-MINOR) add alias for report-directory to make it consistent (Ash Cripps) nodejs#33587 crypto: * (SEMVER-MINOR) allow KeyObjects in postMessage (Tobias Nießen) nodejs#33360 * (SEMVER-MINOR) add randomInt function (Oli Lalonde) nodejs#34600 deps: * upgrade to libuv 1.39.0 (Colin Ihrig) nodejs#34915 * upgrade npm to 6.14.7 (claudiahdz) nodejs#34468 * upgrade to libuv 1.38.1 (Colin Ihrig) nodejs#34187 dgram: * (SEMVER-MINOR) add IPv6 scope id suffix to received udp6 dgrams (Pekka Nikander) nodejs#14500 * (SEMVER-MINOR) allow typed arrays in .send() (Sarat Addepalli) nodejs#22413 doc: * (SEMVER-MINOR) Add maxTotalSockets option to agent constructor (rickyes) nodejs#33617 * (SEMVER-MINOR) add basic embedding example documentation (Anna Henningsen) nodejs#30467 * add Ricky Zhou to collaborators (rickyes) nodejs#34676 * add release key for Ruy Adorno (Ruy Adorno) nodejs#34628 * add DerekNonGeneric to collaborators (Derek Lewis) nodejs#34602 * add AshCripps to collaborators (Ash Cripps) nodejs#34494 * add HarshithaKP to collaborators (Harshitha K P) nodejs#34417 * add rexagod to collaborators (Pranshu Srivastava) nodejs#34457 * add release key for Richard Lau (Richard Lau) nodejs#34397 * add danielleadams to collaborators (Danielle Adams) nodejs#34360 * add sxa as collaborator (Stewart X Addison) nodejs#34338 * add ruyadorno to collaborators (Ruy Adorno) nodejs#34297 * (SEMVER-MAJOR) deprecate process.umask() with no arguments (Colin Ihrig) nodejs#32499 embedding: * (SEMVER-MINOR) make Stop() stop Workers (Anna Henningsen) nodejs#32531 * (SEMVER-MINOR) provide hook for custom process.exit() behaviour (Anna Henningsen) nodejs#32531 fs: * (SEMVER-MINOR) implement lutimes (Maël Nison) nodejs#33399 http: * (SEMVER-MINOR) add maxTotalSockets to agent class (rickyes) nodejs#33617 * (SEMVER-MINOR) return this from IncomingMessage#destroy() (Colin Ihrig) nodejs#32789 * (SEMVER-MINOR) expose host and protocol on ClientRequest (wenningplus) nodejs#33803 http2: * (SEMVER-MINOR) return this for Http2ServerRequest#setTimeout (Pranshu Srivastava) nodejs#33994 * (SEMVER-MINOR) do not modify explicity set date headers (Pranshu Srivastava) nodejs#33160 module: * (SEMVER-MINOR) named exports for CJS via static analysis (Guy Bedford) nodejs#35249 * (SEMVER-MINOR) exports pattern support (Guy Bedford) nodejs#34718 * (SEMVER-MINOR) package "imports" field (Guy Bedford) nodejs#34117 * (SEMVER-MINOR) deprecate module.parent (Antoine du HAMEL) nodejs#32217 n-api: * (SEMVER-MINOR) create N-API version 7 (Gabriel Schulhof) nodejs#35199 * (SEMVER-MINOR) support type-tagging objects (Gabriel Schulhof) nodejs#28237 n-api,src: * (SEMVER-MINOR) provide asynchronous cleanup hooks (Anna Henningsen) nodejs#34572 perf_hooks: * (SEMVER-MINOR) add idleTime and event loop util (Trevor Norris) nodejs#34938 timers: * (SEMVER-MINOR) allow timers to be used as primitives (Denys Otrishko) nodejs#34017 tls: * (SEMVER-MINOR) make 'createSecureContext' honor more options (Mateusz Krawczuk) nodejs#33974 worker: * (SEMVER-MINOR) add public method for marking objects as untransferable (Anna Henningsen) nodejs#33979 * (SEMVER-MINOR) emit `'messagerror'` events for failed deserialization (Anna Henningsen) nodejs#33772 * (SEMVER-MINOR) allow passing JS wrapper objects via postMessage (Anna Henningsen) nodejs#33772 * (SEMVER-MINOR) allow transferring/cloning generic BaseObjects (Anna Henningsen) nodejs#33772 * (SEMVER-MINOR) add option to track unmanaged file descriptors (Anna Henningsen) nodejs#34303 * (SEMVER-MINOR) add stack size resource limit option (Anna Henningsen) nodejs#33085 worker,fs: * (SEMVER-MINOR) make FileHandle transferable (Anna Henningsen) nodejs#33772 zlib: * (SEMVER-MINOR) add `maxOutputLength` option (unknown) nodejs#33516 * switch to lazy init for zlib streams (Andrey Pechkurov) nodejs#34048 PR-URL: nodejs#35401

Add libuv's cumulative idle time in the diagnostic report. Add the data under the libuv's loop section Refs: #34938 PR-URL: #35940 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>

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trevnorris force-pushed the idle-time branch from 35e4e2f to 3c2ff81 Compare August 26, 2020 19:01

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[discuss] event loop idle metrics #33026

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richardlau added a commit that referenced this pull request Sep 2, 2020

2020-09-08, Version 14.10.0 (Current)

34b1da2

Notable changes: - buffer: also alias BigUInt methods (Anna Henningsen) #34960 - perf_hooks: add idleTime and event loop util (Trevor Norris) #34938 PR-URL: #35023

richardlau added a commit that referenced this pull request Sep 3, 2020

2020-09-08, Version 14.10.0 (Current)

a3b479b

Notable changes: - buffer: also alias BigUInt methods (Anna Henningsen) #34960 - perf_hooks: add idleTime and event loop util (Trevor Norris) #34938 PR-URL: #35023

xamgore mentioned this pull request Sep 8, 2020

Add event loop idle and active time prometheus/client_js#399

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codebytere added a commit to electron/electron that referenced this pull request Sep 22, 2020

Fix perf_hooks profiling

2d4d87b

nodejs/node#34938

codebytere mentioned this pull request Sep 28, 2020

v12.19.0 proposal #35401

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cTn-dev mentioned this pull request Oct 13, 2020

Add support for assigning names to worker_threads #32434

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gireeshpunathil mentioned this pull request Nov 3, 2020

src: add loop idle time in diagnostic report #35940

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michaelgoin mentioned this pull request Nov 12, 2020

Reporting of ELU newrelic/node-newrelic#544

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perf_hooks: add idleTime and event loop util by trevnorris · Pull Request #34938 · nodejs/node · GitHub

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