async_hooks: callback trampoline for MakeCallback #33801

Qard · 2020-06-09T03:47:32Z

This is the start of an effort to eliminate the additional two native-to-JavaScript barrier crosses for the before and after events when async_hooks is active. It also moves the domain callback to be triggered within the trampoline rather than on the native side, when there are before/after events to trigger.

I plan to work on making the domain callback trigger fully JavaScript-side tomorrow which should eliminate the need to even have native-side code for domains. Currently the only native code we have for domains is storing the callback in the environment so it can be triggered from this single location in callback.cc. With that no longer being triggered on the native side there's actually no reason to even store it on the native side so that could be easily eliminated to allow domains to live entirely on the JS side.

I'm also hoping to move the execution async resource stack to be managed purely on the JS side too, through this trampoline. This should eliminate the need for the extra state synchronization code needed in #33575 for the performance gains it aims to make.

Side note: There's no try/catch in the trampoline because it currently relies on InternalCallbackScope to catch errors and handle them appropriately. It's also relying on InternalCallbackScope for other things like timer and microtask management, so some deeper modifications will need to be made if we want to move any of that to the JS side too. Personally, I think it's worth considering, and I plan to continue investigating that idea.

Checklist

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

lib/internal/async_hooks.js

addaleax

Looks very nice so far! 🚀

lib/internal/async_hooks.js

src/api/callback.cc

Qard · 2020-06-09T22:10:06Z

I added a commit which removes the last vestiges of native domain code, moving the domain hook callback to be registered directly with async_hooks internals. Eventually I hope to generalize that as a feature for other hook mechanisms like fs hooks, audit hooks, etc. to be able to hook more deeply into the callback execution flow. For now, this domain-specific function storing should be enough.

src/api/callback.cc

Qard · 2020-06-10T23:08:30Z

Here's a full run of all the async_hooks benchmarks.

❯ node benchmark/compare.js --old ./node-master --new ./node-pr-33801 async_hooks | Rscript benchmark/compare.R
[01:57:57|% 100| 4/4 files | 60/60 runs | 3/3 configs]: Done
                                                                                                                                                                           confidence improvement
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='async' type='async-local-storage' benchmarker='test-double-http'                     0.84 %
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='async' type='async-resource' benchmarker='test-double-http'                          1.89 %
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='async' type='destroy' benchmarker='test-double-http'                                 1.16 %
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='callbacks' type='async-local-storage' benchmarker='test-double-http'                 1.87 %
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='callbacks' type='async-resource' benchmarker='test-double-http'                      1.15 %
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='callbacks' type='destroy' benchmarker='test-double-http'                             1.66 %
 async_hooks/gc-tracking.js method='trackingDisabled' n=1000000                                                                                                                           1.01 %
 async_hooks/gc-tracking.js method='trackingEnabled' n=1000000                                                                                                                            2.82 %
 async_hooks/gc-tracking.js method='trackingEnabledWithDestroyHook' n=1000000                                                                                                             2.62 %
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='after' benchmarker='test-double-http'                                                                                   4.02 %
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='all' benchmarker='test-double-http'                                                                                     7.54 %
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='before' benchmarker='test-double-http'                                                                                 -5.42 %
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='disabled' benchmarker='test-double-http'                                                                               -1.76 %
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='init' benchmarker='test-double-http'                                                                                  -13.10 %
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='none' benchmarker='test-double-http'                                                                                   -1.30 %
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='after' benchmarker='test-double-http'                                                                                  3.11 %
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='all' benchmarker='test-double-http'                                                                                   -6.92 %
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='before' benchmarker='test-double-http'                                                                                 0.16 %
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='disabled' benchmarker='test-double-http'                                                                               9.65 %
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='init' benchmarker='test-double-http'                                                                                  -4.49 %
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='none' benchmarker='test-double-http'                                                                                   3.37 %
 async_hooks/promises.js asyncHooks='disabled' n=1000000                                                                                                                                  3.53 %
 async_hooks/promises.js asyncHooks='enabled' n=1000000                                                                                                                                  -4.48 %
 async_hooks/promises.js asyncHooks='enabledWithDestroy' n=1000000                                                                                                                        2.11 %
                                                                                                                                                                          accuracy (*)    (**)   (***)
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='async' type='async-local-storage' benchmarker='test-double-http'           ±3.52%  ±4.69%  ±6.10%
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='async' type='async-resource' benchmarker='test-double-http'                ±3.90%  ±5.19%  ±6.75%
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='async' type='destroy' benchmarker='test-double-http'                       ±3.41%  ±4.54%  ±5.91%
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='callbacks' type='async-local-storage' benchmarker='test-double-http'       ±3.50%  ±4.66%  ±6.06%
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='callbacks' type='async-resource' benchmarker='test-double-http'            ±3.74%  ±4.98%  ±6.48%
 async_hooks/async-resource-vs-destroy.js n=1000000 duration=5 connections=500 path='/' asyncMethod='callbacks' type='destroy' benchmarker='test-double-http'                   ±3.56%  ±4.74%  ±6.17%
 async_hooks/gc-tracking.js method='trackingDisabled' n=1000000                                                                                                                 ±7.10%  ±9.45% ±12.31%
 async_hooks/gc-tracking.js method='trackingEnabled' n=1000000                                                                                                                  ±6.32%  ±8.42% ±10.96%
 async_hooks/gc-tracking.js method='trackingEnabledWithDestroyHook' n=1000000                                                                                                   ±5.68%  ±7.56%  ±9.84%
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='after' benchmarker='test-double-http'                                                                        ±20.25% ±26.97% ±35.14%
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='all' benchmarker='test-double-http'                                                                          ±21.92% ±29.19% ±38.02%
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='before' benchmarker='test-double-http'                                                                       ±17.45% ±23.22% ±30.23%
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='disabled' benchmarker='test-double-http'                                                                     ±18.06% ±24.03% ±31.28%
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='init' benchmarker='test-double-http'                                                                         ±32.32% ±43.30% ±56.95%
 async_hooks/http-server.js duration=5 connections=50 asyncHooks='none' benchmarker='test-double-http'                                                                         ±15.37% ±20.46% ±26.64%
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='after' benchmarker='test-double-http'                                                                       ±19.12% ±25.45% ±33.15%
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='all' benchmarker='test-double-http'                                                                         ±17.86% ±23.76% ±30.93%
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='before' benchmarker='test-double-http'                                                                      ±18.15% ±24.18% ±31.53%
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='disabled' benchmarker='test-double-http'                                                                    ±14.30% ±19.06% ±24.85%
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='init' benchmarker='test-double-http'                                                                        ±17.41% ±23.17% ±30.16%
 async_hooks/http-server.js duration=5 connections=500 asyncHooks='none' benchmarker='test-double-http'                                                                        ±17.19% ±22.88% ±29.77%
 async_hooks/promises.js asyncHooks='disabled' n=1000000                                                                                                                        ±8.05% ±10.73% ±14.01%
 async_hooks/promises.js asyncHooks='enabled' n=1000000                                                                                                                         ±8.50% ±11.32% ±14.74%
 async_hooks/promises.js asyncHooks='enabledWithDestroy' n=1000000                                                                                                             ±10.50% ±13.98% ±18.20%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case there are 24 comparisons, you can thus
expect the following amount of false-positive results:
  1.20 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.24 false positives, when considering a   1% risk acceptance (**, ***),
  0.02 false positives, when considering a 0.1% risk acceptance (***)

src/env.h

With the async_hooks callback trampoline, domains no longer need any native code. With this, domains can exist in pure JavaScript.

addaleax · 2020-06-11T15:20:15Z

@Qard Can you also run the MessagePort benchmark as I did in #33575? It’s somewhat ironic but I find that it tends to give much clearer numbers.

puzpuzpuz · 2020-06-11T17:20:49Z

I've run worker/messageport.js benchmark on CI and here is the result:

20:10:10                                                   confidence improvement accuracy (*)   (**)  (***)
20:10:10  worker/messageport.js n=1000000 payload='object'        ***      3.95 %       ±2.06% ±2.74% ±3.56%
20:10:10  worker/messageport.js n=1000000 payload='string'        ***      6.48 %       ±2.54% ±3.39% ±4.41%
20:10:10 
20:10:10 Be aware that when doing many comparisons the risk of a false-positive
20:10:10 result increases. In this case there are 2 comparisons, you can thus
20:10:10 expect the following amount of false-positive results:
20:10:10   0.10 false positives, when considering a   5% risk acceptance (*, **, ***),
20:10:10   0.02 false positives, when considering a   1% risk acceptance (**, ***),
20:10:10   0.00 false positives, when considering a 0.1% risk acceptance (***)

https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/604/

Qard · 2020-06-11T17:41:14Z

Switched to ready to review. It's functional as it is and seems to provide a bit of improvement already. I still intend to follow this up with some more changes I'm working on now to move the resource stack management to JS, but I'm less certain about that part due to the current need to always track the resources, even when async_hooks is disabled.

src/api/callback.cc

nodejs-github-bot · 2020-06-19T03:50:55Z

CI: https://ci.nodejs.org/job/node-test-pull-request/31936/

PR-URL: #33801 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Andrey Pechkurov <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]>

With the async_hooks callback trampoline, domains no longer need any native code. With this, domains can exist in pure JavaScript. PR-URL: #33801 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Andrey Pechkurov <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]>

646e5a4 changed the way that the domain hook callback is called. Previously, the callback was only used in the case that async_hooks were *not* being used (since domains already integrate with async hooks the way they should), and the corresponding deprecation warning also only emitted in that case. However, that commit didn’t move that condition along when the code was ported from C++ to JS. As a consequence, the domain hook callback was used when it wasn’t necessary to use it, and the deprecation warning emitted accidentally along with it. Refs: 646e5a4#diff-9f21ce1b9d6d46fdd07b969e8a04e140L192 Refs: 646e5a4#diff-e6db408e12db906ead6ddfac3de15a6fR119 Refs: #33801 (comment) PR-URL: #34245 Fixes: #34069 Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Shelley Vohr <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Andrey Pechkurov <[email protected]> Reviewed-By: Stephen Belanger <[email protected]>

646e5a4 changed the way that the domain hook callback is called. Previously, the callback was only used in the case that async_hooks were *not* being used (since domains already integrate with async hooks the way they should), and the corresponding deprecation warning also only emitted in that case. However, that commit didn’t move that condition along when the code was ported from C++ to JS. As a consequence, the domain hook callback was used when it wasn’t necessary to use it, and the deprecation warning emitted accidentally along with it. Refs: nodejs@646e5a4#diff-9f21ce1b9d6d46fdd07b969e8a04e140L192 Refs: nodejs@646e5a4#diff-e6db408e12db906ead6ddfac3de15a6fR119 Refs: nodejs#33801 (comment) PR-URL: nodejs#34245 Fixes: nodejs#34069 Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Shelley Vohr <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Andrey Pechkurov <[email protected]> Reviewed-By: Stephen Belanger <[email protected]>

Qard added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. async_hooks Issues and PRs related to the async hooks subsystem. labels Jun 9, 2020

Qard requested review from addaleax, vdeturckheim and puzpuzpuz June 9, 2020 03:47

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Qard force-pushed the async-hooks-callback-trampoline branch from 2096bab to 8942366 Compare June 9, 2020 17:25

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addaleax mentioned this pull request Jun 10, 2020

async_hooks: improve resource stack performance #33575

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Qard force-pushed the async-hooks-callback-trampoline branch from a0fd282 to 410acd0 Compare June 10, 2020 23:24

Qard added 2 commits June 10, 2020 16:26

async_hooks: callback trampoline for MakeCallback

34d91e5

domain: remove native domain code

27276c3

With the async_hooks callback trampoline, domains no longer need any native code. With this, domains can exist in pure JavaScript.

Qard force-pushed the async-hooks-callback-trampoline branch from 410acd0 to 27276c3 Compare June 10, 2020 23:26

Qard marked this pull request as ready for review June 11, 2020 17:35

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Qard added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jun 15, 2020

noahbrenner mentioned this pull request Jul 17, 2020

Deprecation warning since Node 14.5.0 gulpjs/gulp#2460

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puzpuzpuz mentioned this pull request Jul 25, 2020

feat: add async HTTP context adonisjs/http-server#18

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Scope manager and exporter integration tests DataDog/dd-trace-js#1224

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async_hooks: callback trampoline for MakeCallback #33801

async_hooks: callback trampoline for MakeCallback #33801

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nodejs-github-bot commented Jun 19, 2020

async_hooks: callback trampoline for MakeCallback #33801

async_hooks: callback trampoline for MakeCallback #33801

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