[8.x] deps: V8: backport b49206d from upstream #21529
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nodejs-github-bot
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v8 engine
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CI: https://ci.nodejs.org/job/node-test-pull-request/15610/ I haven't launched a V8-CI yet as that is blocked by #21433 |
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@ofrobots Any idea when this will make it to general release? |
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This is currently blocked on #21534. |
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V8 CI: https://ci.nodejs.org/view/All/job/node-test-commit-v8-linux/1494/ x86 is passing |
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V8-CI is green. I will go ahead and land this on |
This is the v8.x backport of nodejs#20727. Original commit message: ThreadDataTable: Change global linked list to per-Isolate hash map. For use cases with a large number of threads or a large number of isolates (or both), ThreadDataTable can be a major performance bottleneck due to O(n) lookup time of the linked list. Switching to a hash map reduces this to O(1). Example 1: Sandstorm.io, a Node.js app that utilizes "fibers", was observed spending the majority of CPU time iterating over the ThreadDataTable. See: https://sandstorm.io/news/2016-09-30-fiber-bomb-debugging-story Example 2: Cloudflare's Workers engine, a high-multi-tenancy web server framework built on V8 (but not Node), creates large numbers of threads and isolates per-process. It saw a 34x improvement in throughput when we applied this patch. Cloudflare has been using a patch in production since the Worker launch which replaces the linked list with a hash map -- but still global. This commit builds on that but goes further and creates a separate hash map and mutex for each isolate, with the table being a member of the Isolate class. This avoids any globals and should reduce lock contention. Bug: v8:5338 Change-Id: If0d11509afb2e043b888c376e36d3463db931b47 Reviewed-on: https://chromium-review.googlesource.com/1014407 Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{nodejs#52753} Backport-PR-URL: nodejs#21529 PR-URL: nodejs#20727 Refs: nodejs#20083 Refs: nodejs#20083 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com>
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Landed on |
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Thanks for getting this over the line @ofrobots!!! This will be a massive benefit to the Meteor community |
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How long until this change is properly released? |
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This is the v8.x backport of #20727. Original commit message: ThreadDataTable: Change global linked list to per-Isolate hash map. For use cases with a large number of threads or a large number of isolates (or both), ThreadDataTable can be a major performance bottleneck due to O(n) lookup time of the linked list. Switching to a hash map reduces this to O(1). Example 1: Sandstorm.io, a Node.js app that utilizes "fibers", was observed spending the majority of CPU time iterating over the ThreadDataTable. See: https://sandstorm.io/news/2016-09-30-fiber-bomb-debugging-story Example 2: Cloudflare's Workers engine, a high-multi-tenancy web server framework built on V8 (but not Node), creates large numbers of threads and isolates per-process. It saw a 34x improvement in throughput when we applied this patch. Cloudflare has been using a patch in production since the Worker launch which replaces the linked list with a hash map -- but still global. This commit builds on that but goes further and creates a separate hash map and mutex for each isolate, with the table being a member of the Isolate class. This avoids any globals and should reduce lock contention. Bug: v8:5338 Change-Id: If0d11509afb2e043b888c376e36d3463db931b47 Reviewed-on: https://chromium-review.googlesource.com/1014407 Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#52753} Backport-PR-URL: #21529 PR-URL: #20727 Refs: #20083 Refs: #20083 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com>
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8.xbackport of #20727make -j4 test(UNIX), orvcbuild test(Windows) passes@MylesBorins @nodejs/v8-update