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A new tool: mach power
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Nicholas Nethercote
Sep 17, 2015, 9:32:32 PM9/17/15
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Hi,
I just landed a new mach command called |mach power|. It combines the
most useful top-level measurements from tools/power/rapl and
powermetrics, and produces these automatically for Firefox, Chrome and
Safari. Unfortunately it's Mac-only, because powermetrics is Mac-only.
I've used this tool in numerous bugs to do initial comparisons between
browsers on a particular workload, e.g.
https://bugzilla.mozilla.org/show_bug.cgi?id=1190719#c17. It's a great
starting place because it immediately gives you an idea how the
browsers compare in terms of the most important measurements: power,
CPU usage, GPU usage, and wakeups.
The bug was https://bugzilla.mozilla.org/show_bug.cgi?id=1204787. The
documentation is at
https://developer.mozilla.org/en-US/docs/Mozilla/Performance/powermetrics#mach_power.
Nick
I just landed a new mach command called |mach power|. It combines the
most useful top-level measurements from tools/power/rapl and
powermetrics, and produces these automatically for Firefox, Chrome and
Safari. Unfortunately it's Mac-only, because powermetrics is Mac-only.
I've used this tool in numerous bugs to do initial comparisons between
browsers on a particular workload, e.g.
https://bugzilla.mozilla.org/show_bug.cgi?id=1190719#c17. It's a great
starting place because it immediately gives you an idea how the
browsers compare in terms of the most important measurements: power,
CPU usage, GPU usage, and wakeups.
The bug was https://bugzilla.mozilla.org/show_bug.cgi?id=1204787. The
documentation is at
https://developer.mozilla.org/en-US/docs/Mozilla/Performance/powermetrics#mach_power.
Nick
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