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test: fix flaky test-regress-GH-897 #10903

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test: fix flaky test-regress-GH-897 #10903

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Trott
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@Trott Trott commented Jan 19, 2017

Even after being moved to sequential in
1ce05ad, test-regress-GH-897 still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to parallel and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to parallel. I am able to
run many copies of the test simultaneously without seeing test failures.

Fixes: #10073

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

test timers

@Trott
test: fix flaky test-regress-nodejsGH-897
65d0489 
Even after being moved to `sequential` in
1ce05ad, `test-regress-nodejsGH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

Fixes: nodejs#10073
@Trott Trott added test Issues and PRs related to the tests. timers Issues and PRs related to the timers subsystem / setImmediate, setInterval, setTimeout. labels Jan 19, 2017
@nodejs-github-bot nodejs-github-bot added test Issues and PRs related to the tests. lts-watch-v6.x labels Jan 19, 2017
@Trott
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Trott commented Jan 19, 2017

/cc @nodejs/testing @Fishrock123 @misterdjules

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Trott commented Jan 19, 2017

CI: https://ci.nodejs.org/job/node-test-pull-request/5955/

@cjihrig
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cjihrig commented Jan 19, 2017

If you go with this approach, do you think it might be worth throwing a 0 millisecond timeout into the mix?

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Trott commented Jan 19, 2017 •
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If you go with this approach, do you think it might be worth throwing a 0 millisecond timeout into the mix?

I was going to do that in a subsequent PR (although if someone eager wants to beat me to it, I will be happy to not do it myself). Basically, find out if we're already testing for things like 0, -1, undefined, those sorts of things. Make sure they all get coerced to 1. If so, consolidate into a single file. If not, move them here, rename the file, and have it be the general "this makes sure your wonky values get coerced to 1 in timers" test.

Trott added a commit to Trott/io.js that referenced this pull request Jan 23, 2017
@Trott
test: fix flaky test-regress-nodejsGH-897
80c72c6 
Even after being moved to `sequential` in
1ce05ad, `test-regress-nodejsGH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: nodejs#10903
Fixes: nodejs#10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@Trott
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Trott commented Jan 23, 2017

Landed in 80c72c6

@Trott Trott closed this Jan 23, 2017
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 25, 2017
@Trott @italoacasas
test: fix flaky test-regress-nodejsGH-897
09f2831 
Even after being moved to `sequential` in
1ce05ad, `test-regress-nodejsGH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: nodejs#10903
Fixes: nodejs#10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@italoacasas italoacasas mentioned this pull request Jan 25, 2017
Closed
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 27, 2017
@Trott @italoacasas
test: fix flaky test-regress-nodejsGH-897
3ce9681 
Even after being moved to `sequential` in
1ce05ad, `test-regress-nodejsGH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: nodejs#10903
Fixes: nodejs#10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@italoacasas italoacasas mentioned this pull request Jan 29, 2017
Merged
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 30, 2017
@Trott @italoacasas
test: fix flaky test-regress-nodejsGH-897
9d5170f 
Even after being moved to `sequential` in
1ce05ad, `test-regress-nodejsGH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: nodejs#10903
Fixes: nodejs#10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 30, 2017
@Trott @italoacasas
test: fix flaky test-regress-nodejsGH-897
1b8c238 
Even after being moved to `sequential` in
1ce05ad, `test-regress-nodejsGH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: nodejs#10903
Fixes: nodejs#10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
MylesBorins pushed a commit that referenced this pull request Mar 8, 2017
@Trott @MylesBorins
test: fix flaky test-regress-GH-897
8ecd878 
Even after being moved to `sequential` in
1ce05ad, `test-regress-GH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: #10903
Fixes: #10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
MylesBorins pushed a commit that referenced this pull request Mar 9, 2017
@Trott @MylesBorins
test: fix flaky test-regress-GH-897
e59697c 
Even after being moved to `sequential` in
1ce05ad, `test-regress-GH-897` still
was occasionally flaky on Raspberry Pi devices on CI.

The test is especially sensitive to resource constraints. It failed
reliably on my laptop if I moved it to `parallel` and ran 32 competing
node test processes. Even for a flaky test, that's unusually low. I
typically don't see problems, even for flaky tests, until I get up to
around four times that number.

On a Raspberry Pi, of course, that sensitivity to resource constraints
will manifest much sooner.

This change checks the order of timers firing, rather than the duration
before a timer is fired. This eliminates the sensitivity to resource
constraints. The test can now be moved back to `parallel`. I am able to
run many copies of the test simultaneously without seeing test failures.

PR-URL: #10903
Fixes: #10073
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Mar 9, 2017
Merged
@Trott Trott deleted the fix-test-regress-gh-897 branch January 13, 2022 22:45
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investigate flaky sequential/test-regress-GH-897 on Raspberry Pi
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