Open
Bug 878804
Opened 11 years ago
Updated 2 years ago
Firefox spins with 100% of CPU in mach_message_trap
Categories
(Core :: General, defect)
Core
General
Tracking
()
NEW
People
(Reporter: justin.lebar+bug, Unassigned)
Details
(Keywords: perf)
http://people.mozilla.com/~bgirard/cleopatra/#report=5e274cf239170180d9f19367c2ef2443b3438d2a I don't understand what's going on in this profile, but Firefox is sitting using 100% of one CPU with all but two bugzilla tabs closed. That seems pretty bad! Nightly built from http://hg.mozilla.org/mozilla-central/rev/b94e996b05fd Mac OS 10.8.
Comment 1•11 years ago
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You don't have js profiling enable (you should) but I'm going to guess that it's Firefox Sync (or maybe FHR but I think it got fixed) that's spinning the event loop. It looks like your main thread is mostly idle waiting on events with a nested event loop. Your CPU usage is likely coming from another thread. I suggest using Instruments.
Reporter | ||
Comment 2•11 years ago
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I've restarted my browser (sorry), but the "js profiling" checkbox is checked. Is there anything else I need to do to get that working? If it happens again I'll use instruments.
Comment 3•11 years ago
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> Firefox is sitting using 100% of one CPU
How did you measure this?
Reporter | ||
Comment 4•11 years ago
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(In reply to Steven Michaud from comment #3) > > Firefox is sitting using 100% of one CPU > > How did you measure this? Activity monitor.
Updated•2 years ago
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Severity: normal → S3
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Description
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