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http: use v8::Array::New() with a prebuilt vector #46447

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merged 3 commits into from
Feb 8, 2023

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Avoid using v8::Array::Set() which results in JS execution and is thus slow. Prebuild the vector in C++ land and build the JS array directly with that vector whereever possible.

Avoid using v8::Array::Set() which results in JS execution and is
thus slow. Prebuild the vector in C++ land and build the
JS array directly with that vector whereever possible.
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Review requested:

  • @nodejs/http
  • @nodejs/net

@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. http_parser Issues and PRs related to the HTTP Parser dependency or the http_parser binding. needs-ci PRs that need a full CI run. labels Jan 31, 2023
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lgtm

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ConnectionsList* list;

ASSIGN_OR_RETURN_UNWRAP(&list, args.Holder());

uint32_t i = 0;
std::vector<Local<Value>> result;
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What about using MaybeStackBuffer to avoid allocations if number of elements is not too high?

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@joyeecheung joyeecheung Feb 4, 2023

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I think v8::Array -> std::vector would make sense (to avoid C++ -> JS invocation costs) but std::vector -> MaybeStackBuffer probably would not make much difference...(and personally I prefer STL unless the home-grown alternatives makes a significant difference)

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@joyeecheung joyeecheung added commit-queue Add this label to land a pull request using GitHub Actions. commit-queue-squash Add this label to instruct the Commit Queue to squash all the PR commits into the first one. labels Feb 8, 2023
@nodejs-github-bot nodejs-github-bot removed the commit-queue Add this label to land a pull request using GitHub Actions. label Feb 8, 2023
@nodejs-github-bot nodejs-github-bot merged commit a5ede9c into nodejs:main Feb 8, 2023
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Landed in a5ede9c

MylesBorins pushed a commit that referenced this pull request Feb 18, 2023
Avoid using v8::Array::Set() which results in JS execution and is
thus slow. Prebuild the vector in C++ land and build the
JS array directly with that vector whereever possible.

PR-URL: #46447
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Gerhard Stöbich <[email protected]>
Reviewed-By: James M Snell <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Feb 19, 2023
danielleadams pushed a commit that referenced this pull request Apr 11, 2023
Avoid using v8::Array::Set() which results in JS execution and is
thus slow. Prebuild the vector in C++ land and build the
JS array directly with that vector whereever possible.

PR-URL: #46447
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Gerhard Stöbich <[email protected]>
Reviewed-By: James M Snell <[email protected]>
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8 participants