[8.x] deps: V8: backport b49206d from upstream #21529
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
nodejs-github-bot
added
v8 engine
|
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 |
2 tasks
|
@ofrobots Any idea when this will make it to general release? |
|
This is currently blocked on #21534. |
|
V8 CI: https://ci.nodejs.org/view/All/job/node-test-commit-v8-linux/1494/ x86 is passing |
|
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>
ofrobots
force-pushed
the
backport/8/20727
branch
from
d877b28 to
646445b
Compare
|
Landed on |
|
Thanks for getting this over the line @ofrobots!!! This will be a massive benefit to the Meteor community |
|
How long until this change is properly released? |
rvagg
pushed a commit
that referenced
this pull request
Aug 16, 2018
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>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
8.xbackport of #20727make -j4 test(UNIX), orvcbuild test(Windows) passes@MylesBorins @nodejs/v8-update