Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

src: add option to report large page stats #32331

Closed
wants to merge 1 commit into from
Closed

src: add option to report large page stats #32331

wants to merge 1 commit into from

Conversation

gabrielschulhof
Copy link
Contributor

This adds the new option verbose to --use-largepages that works the
same way as on, but additionally outputs memory range and page count
information to stderr.

Signed-off-by: @gabrielschulhof

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • documentation is changed or added
  • commit message follows commit guidelines

@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Mar 17, 2020
@nodejs-github-bot
Copy link
Collaborator

CI: https://ci.nodejs.org/job/node-test-pull-request/29906/

@bnoordhuis
Copy link
Member

Before I review this: when or why (or to whom) would this be useful?

@cjihrig
Copy link
Contributor

cjihrig commented Mar 18, 2020 •
edited
Loading

Is this something that could leverage the existing NODE_DEBUG_NATIVE environment variable, instead of adding a new mode?

@gabrielschulhof
Copy link
Contributor Author

gabrielschulhof commented Mar 18, 2020 •
edited
Loading

@cjihrig I'd love to switch to NODE_DEBUG_NATIVE but, according to the documentation, its value is a list of native modules to debug, whereas the large pages statistics do not originate from any built-in native module, but rather from the runtime itself.

Is it within the semantics of NODE_DEBUG_NATIVE that I should could fprintf(stderr, ... if NODE_DEBUG_NATIVE is set to any non-NULL value?

@gabrielschulhof
Copy link
Contributor Author

@bnoordhuis I've used these fprintfs to see if I can maximize the code getting mapped to large pages. Another use might be if you see no benefit from running with --use-largepages=on. Then you might run with --use-largepages=verbose and see if the code that is hot for you is getting snipped off because it is at the beginning or end of the range we remap.

@cjihrig
Copy link
Contributor

cjihrig commented Mar 18, 2020

according to the documentation, its value is a list of native modules to debug, whereas the large pages statistics do not originate from any built-in native module, but rather from the runtime itself.

I think that definition might only be loosely enforced in the code. I'd personally be fine with a large pages category (and would prefer it over this approach). I guess we could see if anyone else objects though.

Is it within the semantics of NODE_DEBUG_NATIVE that I should fprintf(stderr, ... if NODE_DEBUG_NATIVE is set to any non-NULL value?

I don't think you'd use fprintf() explicitly. There are helpers in place already. This is how it's done in WASI, for example.

@gabrielschulhof
Copy link
Contributor Author

@cjihrig thanks for the pointer!

@jasnell
Copy link
Member

jasnell commented Mar 18, 2020

I would definitely prefer just using NODE_DEBUG_NATIVE for this. You can easily add a new category specific for this and it doesn't have to be limited to just debug output for modules.

@gabrielschulhof
Copy link
Contributor Author

@jasnell @cjihrig I looked at the implementation of Debug, and it requires an Environment*. The problem is, when this code runs, the Environment* is not yet created. So, I would have to check NODE_DEBUG_NATIVE by hand.

@jasnell
Copy link
Member

jasnell commented Mar 19, 2020

hmm ok. Is it possible/reasonable to defer the logging until Environment is available?

@gabrielschulhof
Copy link
Contributor Author

@jasnell looks like there might be a way to use the debug without an Environment 🤔

src: add debug option to report large page stats
436cc4d 
This adds the new option `HUGEPAGES` to `NODE_DEBUG_NATIVE` that
causes the code responsible for re-mapping to large pages to output
memory range and page count information to `stderr`.

Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
@gabrielschulhof
Copy link
Contributor Author

@jasnell @cjihrig I updated the PR to use Debug().

@nodejs-github-bot
Copy link
Collaborator

CI: https://ci.nodejs.org/job/node-test-pull-request/29955/

@gabrielschulhof
Copy link
Contributor Author

Landed in c160073.

gabrielschulhof pushed a commit that referenced this pull request Mar 20, 2020
src: add debug option to report large page stats
c160073 
This adds the new option `HUGEPAGES` to `NODE_DEBUG_NATIVE` that
causes the code responsible for re-mapping to large pages to output
memory range and page count information to `stderr`.

Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
PR-URL: #32331
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
@gabrielschulhof gabrielschulhof deleted the large-pages-verbose branch March 20, 2020 17:45
MylesBorins pushed a commit that referenced this pull request Mar 24, 2020
@MylesBorins
src: add debug option to report large page stats
243d0d4 
This adds the new option `HUGEPAGES` to `NODE_DEBUG_NATIVE` that
causes the code responsible for re-mapping to large pages to output
memory range and page count information to `stderr`.

Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
PR-URL: #32331
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Mar 24, 2020
Merged
@targos
Copy link
Member

targos commented Apr 22, 2020

Depends on the large pages change to land on v12.x

targos pushed a commit to targos/node that referenced this pull request Apr 25, 2020
@targos
src: add debug option to report large page stats
193d634 
This adds the new option `HUGEPAGES` to `NODE_DEBUG_NATIVE` that
causes the code responsible for re-mapping to large pages to output
memory range and page count information to `stderr`.

Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
PR-URL: nodejs#32331
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
targos pushed a commit that referenced this pull request Apr 28, 2020
@targos
src: add debug option to report large page stats
df046de 
This adds the new option `HUGEPAGES` to `NODE_DEBUG_NATIVE` that
causes the code responsible for re-mapping to large pages to output
memory range and page count information to `stderr`.

Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
PR-URL: #32331
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
@targos targos mentioned this pull request May 2, 2020
Merged
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers

@devnexen devnexen devnexen approved these changes

@cjihrig cjihrig cjihrig approved these changes

@bnoordhuis bnoordhuis bnoordhuis approved these changes

@lundibundi lundibundi Awaiting requested review from lundibundi

Assignees
No one assigned
Labels
c++ Issues and PRs that require attention from people who are familiar with C++.
Projects
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.
7 participants
@gabrielschulhof @nodejs-github-bot @bnoordhuis @cjihrig @jasnell @targos @devnexen