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perf_hooks: emit user timing marks, measures and timerify to trace events #18789

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@jasnell jasnell commented Feb 14, 2018

Emit user timing marks/measures and performance.timerify() measures to trace events.

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/cc @nodejs/diagnostics @mcollina

Checklist
  • 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
Affected core subsystem(s)

perf_hooks, trace_events

@jasnell jasnell added trace_events Issues and PRs related to V8, Node.js core, and userspace code trace events. perf_hooks Issues and PRs related to the implementation of the Performance Timing API. labels Feb 14, 2018
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Feb 14, 2018
@AndreasMadsen
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Didn’t review closely but tests are missing.

src/node_perf.cc Outdated
// TODO(jasnell): Once Tracing API is fully implemented, this should
// record a trace event also.
TRACE_EVENT_COPY_MARK_WITH_TIMESTAMP(
"node.perf,node.perf.usertiming", *name, now / 1e3);
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@ofrobots ofrobots Feb 15, 2018

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IIRC, this is doing a floating point divide which is more expensive than an integer divide. 1000 would be an integral constant.

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ah yeah, good point :-)

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Confirmed. Floating point divide + 2 conversions between integer and floating point.

#include <stdint.h>
uint64_t foo(uint64_t nanos) {
   return nanos / 1e3;
}
// clang -O3 -mllvm --x86-asm-syntax=intel -S foo.c
	movq	xmm0, rdi
	punpckldq	xmm0, xmmword ptr [rip + LCPI0_0] ## xmm0 = xmm0[0],mem[0],xmm0[1],mem[1]
	subpd	xmm0, xmmword ptr [rip + LCPI0_1]
	haddpd	xmm0, xmm0
	divsd	xmm0, qword ptr [rip + LCPI0_2]
	movsd	xmm1, qword ptr [rip + LCPI0_3] ## xmm1 = mem[0],zero
	movapd	xmm2, xmm0
	subsd	xmm2, xmm1
	cvttsd2si	rax, xmm2
	movabs	rcx, -9223372036854775808
	xor	rcx, rax
	cvttsd2si	rax, xmm0
	ucomisd	xmm0, xmm1
	cmovae	rax, rcx
	pop	rbp
	ret

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jasnell commented Feb 15, 2018

@ofrobots ... nit fixed!
@AndreasMadsen ... test added.

src/node_perf.cc Outdated
env->performance_entry_callback(),
1, &object);
1, &object, {0, 0});
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Question: what would the the correct context here? To me it seems that an AsyncResource or async_context be created when the observer is constructed, and that should be used on the callback. Do you agree?

Aside: Do our compilers support async_context{0,0} syntax yet?

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Still thinking about that. PerformanceObserver currently is not an AsyncResource and only actually exists on the JS side. Making it an AsyncResource would be a minor divergence from the spec but is certainly not out of the question.

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And I don't know about the compilers question.

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If you don't want to inherit from AsyncResource, you can attache an async_context to the PerformanceObserver instances for the same effect.

I'm okay if you want to do this in a follow-on, as the issue existed before this PR, and is orthogonal.

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Added example to #18810 in case it is useful. If the CI passes there, then that would answer the compiler question :).

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jasnell commented Feb 16, 2018

@ofrobots ... just went ahead and made PerformanceObserver an AsyncResource.

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jasnell commented Feb 16, 2018

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jasnell commented Feb 17, 2018

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jasnell commented Feb 17, 2018

CI is looking good with one unrelated failure.

@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 17, 2018
#define INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
phase, category_group, name, id, thread_id, timestamp, flags, ...) \
UNIMPLEMENTED()
#define INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
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Is a sync with upstream?

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In sync with upstream? Nope, not yet. But that reminds me...

@ofrobots ... ^^ To implement this I needed this macro implemented also.

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@jasnell created https://chromium-review.googlesource.com/c/v8/v8/+/924507 that adds the same macro upstream.

Note that for the trace-event macros, a sync with upstream is no longer a necessity. Our copy of trace_event.h is derived from upstream, but has a slightly different implementation. It is okay for them to pick up features at a different pace. Please do continue to ping if we add more macros locally. There is no need to block on upstream.

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LGTM with a nit


The set of categories for which traces are recorded can be specified using the
`--trace-event-categories` flag followed by a list of comma separated category names.
`--trace-event-categories` flag followed by a list of comma separated category
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The flag should be named --trace-events-categories  for consistency.

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This flag already exists and is not introduced by this PR

Adds the `node.perf.usertiming` trace events category for recording
usertiming marks and measures (e.g. `perf_hooks.performance.mark()`)
in the trace events timeline.

Adds the `node.perf.function` trace events category for recording
`perf_hooks.performance.timerify()` durations in the trace events
timeline.
@jasnell jasnell added the semver-minor PRs that contain new features and should be released in the next minor version. label Feb 26, 2018
jasnell added a commit that referenced this pull request Feb 26, 2018
PR-URL: #18789
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
jasnell added a commit that referenced this pull request Feb 26, 2018
Adds the `node.perf.usertiming` trace events category for recording
usertiming marks and measures (e.g. `perf_hooks.performance.mark()`)
in the trace events timeline.

Adds the `node.perf.function` trace events category for recording
`perf_hooks.performance.timerify()` durations in the trace events
timeline.

PR-URL: #18789
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
jasnell added a commit that referenced this pull request Feb 26, 2018
PR-URL: #18789
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
@jasnell
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jasnell commented Feb 26, 2018

Landed in aca8e76, 9e509b6, and 009e418

@jasnell jasnell closed this Feb 26, 2018
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Should this be backported to v9.x-staging? If yes please follow the guide and raise a backport PR, if not let me know or add the dont-land-on label.

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targos commented Apr 2, 2018

This depends on #17640 which can't go in v9.x.

@targos targos added dont-land-on-v9.x and removed author ready PRs that have at least one approval, no pending requests for changes, and a CI started. backport-requested-v9.x labels Apr 2, 2018
MayaLekova pushed a commit to MayaLekova/node that referenced this pull request May 8, 2018
PR-URL: nodejs#18789
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
MayaLekova pushed a commit to MayaLekova/node that referenced this pull request May 8, 2018
Adds the `node.perf.usertiming` trace events category for recording
usertiming marks and measures (e.g. `perf_hooks.performance.mark()`)
in the trace events timeline.

Adds the `node.perf.function` trace events category for recording
`perf_hooks.performance.timerify()` durations in the trace events
timeline.

PR-URL: nodejs#18789
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
MayaLekova pushed a commit to MayaLekova/node that referenced this pull request May 8, 2018
PR-URL: nodejs#18789
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Trott pushed a commit to ZauberNerd/node that referenced this pull request Dec 11, 2020
This reverts commit 009e418.

AFAIU the discussion at [1], PerformanceObserver had been made to
inherit from AsyncResource more or less as a band-aid in lack of a
better async_context candidate to invoke it in. In order to enable
access to AsyncLocalStores from PerformanceObservers invoked
synchronously through e.g. measure() or mark(), the current
async_context, if any, should be retained.

Note that this is a breaking change, but
- as has been commented at [1], PerformanceObserver being derived from
  AsyncResource is a "minor divergence from the spec" anyway,
- to my knowledge this is an internal implementation detail which has
  never been documented and
- I can't think of a good reason why existing PerformanceObserver
  implementations would possibly rely on it.

OTOH, it's probably worthwhile to not potentially invoke before() and
after() async_hooks for each and every PerformanceObserver notification.

[1] nodejs#18789

Co-Authored-By: ZauberNerd <[email protected]>

PR-URL: nodejs#36343
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
targos pushed a commit that referenced this pull request Dec 21, 2020
This reverts commit 009e418.

AFAIU the discussion at [1], PerformanceObserver had been made to
inherit from AsyncResource more or less as a band-aid in lack of a
better async_context candidate to invoke it in. In order to enable
access to AsyncLocalStores from PerformanceObservers invoked
synchronously through e.g. measure() or mark(), the current
async_context, if any, should be retained.

Note that this is a breaking change, but
- as has been commented at [1], PerformanceObserver being derived from
  AsyncResource is a "minor divergence from the spec" anyway,
- to my knowledge this is an internal implementation detail which has
  never been documented and
- I can't think of a good reason why existing PerformanceObserver
  implementations would possibly rely on it.

OTOH, it's probably worthwhile to not potentially invoke before() and
after() async_hooks for each and every PerformanceObserver notification.

[1] #18789

Co-Authored-By: ZauberNerd <[email protected]>

PR-URL: #36343
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
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