Closed Bug 1734597 Opened 1 year ago Closed 1 year ago

about:processes shows slightly active threads and processes as idle on Windows

Categories

(Toolkit :: Performance Monitoring, defect)

Product:
Toolkit
Component:
Performance Monitoring
Type:
defect

Tracking

()

Status:
RESOLVED FIXED
Milestone:
95 Branch
Tracking Flags:
Tracking Status
firefox95 --- fixed

People

(Reporter: florian, Assigned: florian)

References

(Blocks 1 open bug)

Details

Attachments

(1 file)

Bug 1734597 - Make about:processes fallback to cycle count to decide if a thread or process is active to workaround low CPU timing precision on Windows, r=dthayer.
48 bytes, text/x-phabricator-request
Details | Review

On Windows the resolution of the CPU time information is 16ms, so any thread that used less than 16ms in the last seconds is reported as idle. This is annoying because it means we can't figure out which threads cause many short CPU wake ups. The API that is reliable on Windows is the API returning the thread cycle count, so we can use it as a fallback to decide which threads are idle.

Pushed by fqueze@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/df62726f3d16
Make about:processes fallback to cycle count to decide if a thread or process is active to workaround low CPU timing precision on Windows, r=dthayer,fluent-reviewers,flod.

https://hg.mozilla.org/mozilla-central/rev/df62726f3d16

Status: ASSIGNED → RESOLVED
Closed: 1 year ago
status-firefox95: --- → fixed
Resolution: --- → FIXED
Target Milestone: --- → 95 Branch
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