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Keep thread names under 15 characters #2733

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merged 2 commits into from Dec 12, 2021
Merged

Keep thread names under 15 characters #2733

merged 2 commits into from Dec 12, 2021

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ob-stripe
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Description

Keep thread names under 15 characters.

Linux thread names are limited to 15 characters. Trying to set a longer name will just silently do nothing 馃槨

This PR ensures that all threads created by Puma have names that are 15 characters or shorter. Who needs vowels anyway.

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  • I have reviewed the guidelines for contributing to this repository.
  • I have added (or updated) appropriate tests if this PR fixes a bug or adds a feature.
  • My pull request is 100 lines added/removed or less so that it can be easily reviewed.
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  • All new and existing tests passed, including Rubocop.

@nateberkopec
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Makes sense. I'm not a huge fan of some of the changed names here (I would prefer we be as descriptive as possible in the 15 chars available) but that might be bikeshedding.

Could we have a test that uses ps or something to check the thread name?

@ob-stripe
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I'm not a huge fan of some of the changed names here (I would prefer we be as descriptive as possible in the 15 chars available) but that might be bikeshedding.

Totally open to changing names if you have specific suggestions!

Could we have a test that uses ps or something to check the thread name?

There are already a couple of tests that assert some thread names, though they were passing before so I'm not sure how reliable they are. I'll look into adding a Linux-specific test that uses ps or another external tool to get the thread names.

@dentarg dentarg added the waiting-for-changes Waiting on changes from the requestor label Oct 31, 2021
@@ -69,7 +69,7 @@ def start_control

control.binder.parse [str], self, 'Starting control server'

control.run thread_name: 'control'
control.run thread_name: 'ctl'
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Suggestion: lets not change any thread names that are always less than 15 characters.

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The problem is that this thread name is also used as a prefix for its accompanying threadpool threads. So if we don't shorten it, we end up with names like puma control tp 001 which is longer than 15 characters.

@ob-stripe
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I added a Linux-only test that uses ps to assert that the thread name is correctly set at the OS level.

@nateberkopec nateberkopec merged commit 5b94b15 into puma:master Dec 12, 2021
@dentarg
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dentarg commented Dec 12, 2021

Looks like the added test doesn't work on jruby/truffleruby (but do in their -head versions? 馃 they are allowed to fail) Even fails when running only that test bundle e m test/test_thread_pool.rb:65 (testing in docker run --rm -it -v $PWD:/app -w /app ghcr.io/flavorjones/truffleruby:21.3.0 bash), any ideas @ob-stripe?

@dentarg
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dentarg commented Dec 13, 2021

Ah I guess we can't see the thread names in /proc when we run on the JVM

@dentarg
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dentarg commented Dec 13, 2021

Okay, always one step behind @MSP-Greg (fa178f3) 馃槃

@ob-stripe
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Thanks! I was struggling to get the test suite to pass with all different environments.

JuanitoFatas pushed a commit to JuanitoFatas/puma that referenced this pull request Sep 9, 2022
* Keep thread names under 15 characters

* Add test

Co-authored-by: Olivier Bellone <olivier@bellone.fr>
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5 participants