Disable most chaos mode settings on ASan Nightly due to bad performance
Categories
(Core :: Fuzzing, enhancement)
Tracking
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| Tracking | Status | |
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| firefox81 | --- | fixed |
People
(Reporter: decoder, Assigned: decoder)
Details
Attachments
(1 file)
A while ago, ASan Nightly started to become even slower than it used to be and I tracked this down to various MOZ_CHAOSMODE settings. In particular the thread scheduling setting has a huge perf impact. Some other settings have less of an impact but we also have no evidence that they helped since we enabled them. The only setting I have found not to impact performance to badly while still (probably) being useful is the TaskDispatching setting.
I will make a patch to only enable this mode and disable the others.
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Assignee | |
Comment 1•4 years ago
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I just saw that we disabled the other modes already in bug 1494021. Their bad performance might have been an interaction of multiple modes, as TaskDispatching alone seems to do just fine. However, for now I'm going to disable all of them.
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Assignee | |
Comment 2•4 years ago
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Pushed by choller@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/75f2d7b3d898 Disable MOZ_CHAOSMODE by default in ASan Nightly. r=froydnj
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Comment 4•4 years ago
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| bugherder | ||
Description
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