child_process: improve spawn performance on Linux by kvakil · Pull Request #48523 · nodejs/node

kvakil · 2023-06-22T17:25:21Z

deps: V8: cherry-pick 1a782f6543ae

Original commit message:

[base] add build flag to use MADV_DONTFORK
Embedders like Node.js and Electron expose fork(2)/execve(2) to their
users. Unfortunately when the V8 heap is very large, these APIs become
rather slow on Linux, due to the kernel needing to do all the
bookkeeping for the forked process (in clone's dup_mmap and execve's
exec_mmap). Of course, this is useless because the forked child thread
will never actually need to access the V8 heap.
Add a new build flag v8_enable_private_mapping_fork_optimization which
marks all pages allocated by OS::Allocate as MADV_DONTFORK. This
improves the performance of Node.js's fork/execve combination by 10x on
a 600 MB heap.
Fixed: v8:7381
Change-Id: Ib649f774d4a932b41886313ce89acc369923699d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#88447}

Refs: v8/v8@1a782f6

child_process: improve spawn performance on Linux

Speed up child_process.spawn by enabling the new V8 build flag which
makes fork/exec faster.

Here are the results of running the existing benchmark. Note that this
optimization helps more for applications with larger heaps, so this is
somewhat of an underestimate of the real world performance benefits.

$ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr
$ node-benchmark-compare cpr confidence improvement (***)methodName='exec' n=1000 *** 60.84 % ±5.43%methodName='execFile' n=1000 *** 53.72 % ±3.33%methodName='execFileSync' n=1000 *** 9.10 % ±0.84%methodName='execSync' n=1000 *** 10.44 % ±0.97%methodName='spawn' n=1000 *** 53.10 % ±2.90%methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***)

Fixes: #25382
Fixes: #14917
Refs: nodejs/performance#93
Refs: nodejs/performance#89

Original commit message: [base] add build flag to use MADV_DONTFORK Embedders like Node.js and Electron expose fork(2)/execve(2) to their users. Unfortunately when the V8 heap is very large, these APIs become rather slow on Linux, due to the kernel needing to do all the bookkeeping for the forked process (in clone's dup_mmap and execve's exec_mmap). Of course, this is useless because the forked child thread will never actually need to access the V8 heap. Add a new build flag v8_enable_private_mapping_fork_optimization which marks all pages allocated by OS::Allocate as MADV_DONTFORK. This improves the performance of Node.js's fork/execve combination by 10x on a 600 MB heap. Fixed: v8:7381 Change-Id: Ib649f774d4a932b41886313ce89acc369923699d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#88447} Refs: v8/v8@1a782f6

nodejs-github-bot · 2023-06-22T17:25:26Z

Review requested:

@nodejs/gyp
@nodejs/v8-update

nodejs-github-bot · 2023-06-22T17:38:44Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-s390x,v8test=v8test/5405/

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: nodejs#25382Fixes: nodejs#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89

nodejs-github-bot · 2023-06-22T17:40:52Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-ppc64le,v8test=v8test/5405/

nodejs-github-bot · 2023-06-22T18:00:14Z

CI: https://ci.nodejs.org/job/node-test-pull-request/52359/

nodejs-github-bot · 2023-06-22T18:00:41Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=benchmark-ubuntu2204-intel-64,v8test=v8test/5406/

nodejs-github-bot · 2023-06-22T18:03:34Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-s390x,v8test=v8test/5406/

nodejs-github-bot · 2023-06-22T18:05:00Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-ppc64le,v8test=v8test/5406/

nodejs-github-bot · 2023-06-22T20:47:16Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=benchmark-ubuntu2204-intel-64,v8test=v8test/5407/

nodejs-github-bot · 2023-06-22T20:48:30Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-s390x,v8test=v8test/5407/

nodejs-github-bot · 2023-06-22T20:49:05Z

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-ppc64le,v8test=v8test/5407/

nodejs-github-bot · 2023-06-22T20:53:35Z

CI: https://ci.nodejs.org/job/node-test-pull-request/52365/

nodejs-github-bot · 2023-06-22T22:18:28Z

CI: https://ci.nodejs.org/job/node-test-pull-request/52372/

nodejs-github-bot · 2023-06-23T00:07:35Z

CI: https://ci.nodejs.org/job/node-test-pull-request/52375/

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: nodejs#25382Fixes: nodejs#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 PR-URL: nodejs#48523 Refs: v8/v8@1a782f6 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Original commit message: [base] add build flag to use MADV_DONTFORK Embedders like Node.js and Electron expose fork(2)/execve(2) to their users. Unfortunately when the V8 heap is very large, these APIs become rather slow on Linux, due to the kernel needing to do all the bookkeeping for the forked process (in clone's dup_mmap and execve's exec_mmap). Of course, this is useless because the forked child thread will never actually need to access the V8 heap. Add a new build flag v8_enable_private_mapping_fork_optimization which marks all pages allocated by OS::Allocate as MADV_DONTFORK. This improves the performance of Node.js's fork/execve combination by 10x on a 600 MB heap. Fixed: v8:7381 Change-Id: Ib649f774d4a932b41886313ce89acc369923699d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#88447} Refs: v8/v8@1a782f6 PR-URL: nodejs#48523Fixes: nodejs#25382Fixes: nodejs#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: nodejs#25382Fixes: nodejs#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 PR-URL: nodejs#48523 Refs: v8/v8@1a782f6 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

ruyadorno · 2023-09-10T03:38:08Z

This commit does not land cleanly on v18.x-staging and will need manual backport in case we want it in v18.

Original commit message: [base] add build flag to use MADV_DONTFORK Embedders like Node.js and Electron expose fork(2)/execve(2) to their users. Unfortunately when the V8 heap is very large, these APIs become rather slow on Linux, due to the kernel needing to do all the bookkeeping for the forked process (in clone's dup_mmap and execve's exec_mmap). Of course, this is useless because the forked child thread will never actually need to access the V8 heap. Add a new build flag v8_enable_private_mapping_fork_optimization which marks all pages allocated by OS::Allocate as MADV_DONTFORK. This improves the performance of Node.js's fork/execve combination by 10x on a 600 MB heap. Fixed: v8:7381 Change-Id: Ib649f774d4a932b41886313ce89acc369923699d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#88447} Refs: v8/v8@1a782f6 PR-URL: nodejs#48523Fixes: nodejs#25382Fixes: nodejs#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: nodejs#25382Fixes: nodejs#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 PR-URL: nodejs#48523 Refs: v8/v8@1a782f6 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Original commit message: [base] add build flag to use MADV_DONTFORK Embedders like Node.js and Electron expose fork(2)/execve(2) to their users. Unfortunately when the V8 heap is very large, these APIs become rather slow on Linux, due to the kernel needing to do all the bookkeeping for the forked process (in clone's dup_mmap and execve's exec_mmap). Of course, this is useless because the forked child thread will never actually need to access the V8 heap. Add a new build flag v8_enable_private_mapping_fork_optimization which marks all pages allocated by OS::Allocate as MADV_DONTFORK. This improves the performance of Node.js's fork/execve combination by 10x on a 600 MB heap. Fixed: v8:7381 Change-Id: Ib649f774d4a932b41886313ce89acc369923699d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#88447} Refs: v8/v8@1a782f6 PR-URL: #48523 Backport-PR-URL: #50098Fixes: #25382Fixes: #14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: #25382Fixes: #14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 PR-URL: #48523 Backport-PR-URL: #50098 Refs: v8/v8@1a782f6 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

The linked v8 issue is closed. The NodeJS half of that issue has also been resolved. While there still may be issues related to child_process spawn performance, they are not related to this v8 issue. Refs: https://bugs.chromium.org/p/v8/issues/detail?id=7381 Refs: nodejs#48523 Refs: nodejs/performance#138

The linked v8 issue is closed. The NodeJS half of that issue has also been resolved. While there still may be issues related to child_process spawn performance, they are not related to this v8 issue. Refs: https://bugs.chromium.org/p/v8/issues/detail?id=7381 Refs: #48523 Refs: nodejs/performance#138 PR-URL: #51467 Reviewed-By: Keyhan Vakil <kvakil@sylph.kvakil.me> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

The linked v8 issue is closed. The NodeJS half of that issue has also been resolved. While there still may be issues related to child_process spawn performance, they are not related to this v8 issue. Refs: https://bugs.chromium.org/p/v8/issues/detail?id=7381 Refs: nodejs#48523 Refs: nodejs/performance#138 PR-URL: nodejs#51467 Reviewed-By: Keyhan Vakil <kvakil@sylph.kvakil.me> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

The linked v8 issue is closed. The NodeJS half of that issue has also been resolved. While there still may be issues related to child_process spawn performance, they are not related to this v8 issue. Refs: https://bugs.chromium.org/p/v8/issues/detail?id=7381 Refs: #48523 Refs: nodejs/performance#138 PR-URL: #51467 Reviewed-By: Keyhan Vakil <kvakil@sylph.kvakil.me> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Original commit message: [base] add build flag to use MADV_DONTFORK Embedders like Node.js and Electron expose fork(2)/execve(2) to their users. Unfortunately when the V8 heap is very large, these APIs become rather slow on Linux, due to the kernel needing to do all the bookkeeping for the forked process (in clone's dup_mmap and execve's exec_mmap). Of course, this is useless because the forked child thread will never actually need to access the V8 heap. Add a new build flag v8_enable_private_mapping_fork_optimization which marks all pages allocated by OS::Allocate as MADV_DONTFORK. This improves the performance of Node.js's fork/execve combination by 10x on a 600 MB heap. Fixed: v8:7381 Change-Id: Ib649f774d4a932b41886313ce89acc369923699d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#88447} Refs: v8/v8@1a782f6 PR-URL: nodejs/node#48523 Backport-PR-URL: nodejs/node#50098Fixes: nodejs/node#25382Fixes: nodejs/node#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: nodejs/node#25382Fixes: nodejs/node#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 PR-URL: nodejs/node#48523 Backport-PR-URL: nodejs/node#50098 Refs: v8/v8@1a782f6 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Original commit message: [base] add build flag to use MADV_DONTFORK Embedders like Node.js and Electron expose fork(2)/execve(2) to their users. Unfortunately when the V8 heap is very large, these APIs become rather slow on Linux, due to the kernel needing to do all the bookkeeping for the forked process (in clone's dup_mmap and execve's exec_mmap). Of course, this is useless because the forked child thread will never actually need to access the V8 heap. Add a new build flag v8_enable_private_mapping_fork_optimization which marks all pages allocated by OS::Allocate as MADV_DONTFORK. This improves the performance of Node.js's fork/execve combination by 10x on a 600 MB heap. Fixed: v8:7381 Change-Id: Ib649f774d4a932b41886313ce89acc369923699d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4602858 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#88447} Refs: v8/v8@1a782f6 PR-URL: nodejs/node#48523 Backport-PR-URL: nodejs/node#50098Fixes: nodejs/node#25382Fixes: nodejs/node#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

Speed up child_process.spawn by enabling the new V8 build flag which makes fork/exec faster. Here are the results of running the existing benchmark. Note that this optimization helps more for applications with larger heaps, so this is somewhat of an underestimate of the real world performance benefits. ```console $ ./node benchmark/compare.js --runs 15 \ --new ./node \ --old ~/node-v20/out/Release/node \ --filter params child_process > cpr $ node-benchmark-compare cpr confidence improvement (***) methodName='exec' n=1000 *** 60.84 % ±5.43% methodName='execFile' n=1000 *** 53.72 % ±3.33% methodName='execFileSync' n=1000 *** 9.10 % ±0.84% methodName='execSync' n=1000 *** 10.44 % ±0.97% methodName='spawn' n=1000 *** 53.10 % ±2.90% methodName='spawnSync' n=1000 *** 8.64 % ±1.22% 0.01 false positives, when considering a 0.1% risk acceptance (***) ``` Fixes: nodejs/node#25382Fixes: nodejs/node#14917 Refs: nodejs/performance#93 Refs: nodejs/performance#89 PR-URL: nodejs/node#48523 Backport-PR-URL: nodejs/node#50098 Refs: v8/v8@1a782f6 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

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[v18.x backport] child_process: improve spawn performance on Linux #50098
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v18.19.0 release proposal #50953
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doc: remove reference to resolved child_process v8 issue #51467
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Create a new pull request by comparing changes across two branches javascript-indonesias/node#959
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deps: V8: cherry-pick 1a782f6543ae

child_process: improve spawn performance on Linux

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