Backport 6893 for v6.x (buffer: improve creation performance) #7349
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Improves performance of allocating unsafe buffers, creating buffers from an existing ArrayBuffer and creating .slice(...) from existing Buffer by avoiding deoptimizing change of prototype after Uint8Array allocation in favor of ES6 native subclassing. This is done through an internal ES6 class that extends Uint8Array and is used for allocations, but the regular Buffer function is exposed, so calling Buffer(...) with or without `new` continues to work as usual and prototype chains are also preserved. Performance wins for .slice are +120% (2.2x), and, consequently, for unsafe allocations up to +95% (1.9x) for small buffers, and for safe allocations (zero-filled) up to +30% (1.3x). PR-URL: #6893 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Сковорода Никита Андреевич <[email protected]>
nodejs-github-bot
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buffer
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cc @nodejs/buffer |
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LGTM |
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Merging today if no objections. |
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Jun 25, 2016
Improves performance of allocating unsafe buffers, creating buffers from an existing ArrayBuffer and creating .slice(...) from existing Buffer by avoiding deoptimizing change of prototype after Uint8Array allocation in favor of ES6 native subclassing. This is done through an internal ES6 class that extends Uint8Array and is used for allocations, but the regular Buffer function is exposed, so calling Buffer(...) with or without `new` continues to work as usual and prototype chains are also preserved. Performance wins for .slice are +120% (2.2x), and, consequently, for unsafe allocations up to +95% (1.9x) for small buffers, and for safe allocations (zero-filled) up to +30% (1.3x). PR-URL: #7349 Ref: #6893 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Сковорода Никита Андреевич <[email protected]> Reviewed-By: Trevor Norris <[email protected]>
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Landed in ac8e1bf |
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Checklist
make -j4 test(UNIX) orvcbuild test nosign(Windows) passesAffected core subsystem(s)
buffer
Description of change
This is a backport of #6893 for v6.x as per @evanlucas' request. Applied almost cleanly.