Reland workaround for perf-basic-prof filename truncation issue #3520
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
This is a reland of nodejs#3165. The patch abates the truncation of script filenames in the perf-event output produced by V8. V8 commits: Original: v8/v8@03ef3cd Reland: v8/v8@010897c Original commit message: improve perf_basic_prof filename reporting The buffer used for appending filenames to the string printed to the perf_basic_prof log was unnecessarily too small. Bump it up to be at least kUtf8BufferSize. Truncation of filenames makes it really hard to work with profiles gathered on Node.js. Because of the way Node.js works, you can have node module dependencies in deeply nested directories. The last thing you want when investigating a performance problem is to have script names be truncated. This patch is a stop-gap. Ideally, I want no truncation of the filename at all and use a dynamically growing buffer. That would be a larger change, and I wanted to have a quick fix available that can be back-ported to Node.js LTS release. [email protected],[email protected] BUG= Review URL: https://codereview.chromium.org/1388543002
|
LGTM |
|
@ofrobots ... can you please retarget this to land in |
|
CI: https://ci.nodejs.org/job/node-test-pull-request/622/. |
|
The fix was upstream merged into V8-4.7 only: https://code.google.com/p/v8/issues/detail?id=4517. This means this needs to land onto CI for master: https://ci.nodejs.org/job/node-test-pull-request/635 |
|
CI against master, launched properly this time: https://ci.nodejs.org/job/node-test-commit/1003/ |
ofrobots
added a commit
that referenced
this pull request
Oct 28, 2015
This is a reland of #3165. The patch abates the truncation of script filenames in the perf-event output produced by V8. V8 commits: Original: v8/v8@03ef3cd Reland: v8/v8@010897c Original commit message: improve perf_basic_prof filename reporting The buffer used for appending filenames to the string printed to the perf_basic_prof log was unnecessarily too small. Bump it up to be at least kUtf8BufferSize. Truncation of filenames makes it really hard to work with profiles gathered on Node.js. Because of the way Node.js works, you can have node module dependencies in deeply nested directories. The last thing you want when investigating a performance problem is to have script names be truncated. This patch is a stop-gap. Ideally, I want no truncation of the filename at all and use a dynamically growing buffer. That would be a larger change, and I wanted to have a quick fix available that can be back-ported to Node.js LTS release. [email protected],[email protected] BUG= Review URL: https://codereview.chromium.org/1388543002 PR-URL: #3520 Reviewed-By: bnoordhuis - Ben Noordhuis <[email protected]>
ofrobots
added a commit
that referenced
this pull request
Oct 28, 2015
This is a reland of #3165. The patch abates the truncation of script filenames in the perf-event output produced by V8. V8 commits: Original: v8/v8@03ef3cd Reland: v8/v8@010897c Original commit message: improve perf_basic_prof filename reporting The buffer used for appending filenames to the string printed to the perf_basic_prof log was unnecessarily too small. Bump it up to be at least kUtf8BufferSize. Truncation of filenames makes it really hard to work with profiles gathered on Node.js. Because of the way Node.js works, you can have node module dependencies in deeply nested directories. The last thing you want when investigating a performance problem is to have script names be truncated. This patch is a stop-gap. Ideally, I want no truncation of the filename at all and use a dynamically growing buffer. That would be a larger change, and I wanted to have a quick fix available that can be back-ported to Node.js LTS release. [email protected],[email protected] BUG= Review URL: https://codereview.chromium.org/1388543002 PR-URL: #3520 Reviewed-By: bnoordhuis - Ben Noordhuis <[email protected]>
|
Landed in v4.x-staging in 77511eb |
rvagg
pushed a commit
to rvagg/io.js
that referenced
this pull request
Oct 29, 2015
This is a reland of nodejs#3165. The patch abates the truncation of script filenames in the perf-event output produced by V8. V8 commits: Original: v8/v8@03ef3cd Reland: v8/v8@010897c Original commit message: improve perf_basic_prof filename reporting The buffer used for appending filenames to the string printed to the perf_basic_prof log was unnecessarily too small. Bump it up to be at least kUtf8BufferSize. Truncation of filenames makes it really hard to work with profiles gathered on Node.js. Because of the way Node.js works, you can have node module dependencies in deeply nested directories. The last thing you want when investigating a performance problem is to have script names be truncated. This patch is a stop-gap. Ideally, I want no truncation of the filename at all and use a dynamically growing buffer. That would be a larger change, and I wanted to have a quick fix available that can be back-ported to Node.js LTS release. [email protected],[email protected] BUG= Review URL: https://codereview.chromium.org/1388543002 PR-URL: nodejs#3520 Reviewed-By: bnoordhuis - Ben Noordhuis <[email protected]>
ofrobots
added a commit
that referenced
this pull request
Oct 29, 2015
This is a reland of #3165. The patch abates the truncation of script filenames in the perf-event output produced by V8. V8 commits: Original: v8/v8@03ef3cd Reland: v8/v8@010897c Original commit message: improve perf_basic_prof filename reporting The buffer used for appending filenames to the string printed to the perf_basic_prof log was unnecessarily too small. Bump it up to be at least kUtf8BufferSize. Truncation of filenames makes it really hard to work with profiles gathered on Node.js. Because of the way Node.js works, you can have node module dependencies in deeply nested directories. The last thing you want when investigating a performance problem is to have script names be truncated. This patch is a stop-gap. Ideally, I want no truncation of the filename at all and use a dynamically growing buffer. That would be a larger change, and I wanted to have a quick fix available that can be back-ported to Node.js LTS release. [email protected],[email protected] BUG= Review URL: https://codereview.chromium.org/1388543002 PR-URL: #3520 Reviewed-By: bnoordhuis - Ben Noordhuis <[email protected]>
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.
This is a proposed reland of #3165 onto v4.x (EDIT: and v5.x and master). The patch abates
the truncation of script filenames in the perf-event output produced by V8. This greatly improves ability to work with perf profiles. This would be very useful to have in v4.x.
V8 commits:
Original: v8/v8@03ef3cd
Reland: v8/v8@010897c
R=@bnoordhuis, @nodejs/lts
Original commit message:
improve perf_basic_prof filename reporting
The buffer used for appending filenames to the string printed to the
perf_basic_prof log was unnecessarily too small. Bump it up to be at least
kUtf8BufferSize.
Truncation of filenames makes it really hard to work with profiles gathered on
Node.js. Because of the way Node.js works, you can have node module dependencies
in deeply nested directories. The last thing you want when investigating a
performance problem is to have script names be truncated.
This patch is a stop-gap. Ideally, I want no truncation of the filename at all
and use a dynamically growing buffer. That would be a larger change, and I
wanted to have a quick fix available that can be back-ported to Node.js LTS
release.
R=[email protected],[email protected]
BUG=
Review URL: https://codereview.chromium.org/1388543002