It looks like there are similar (though not as bad) shenanigans on Linux. In a fresh Ubuntu install, there are two available frequency governors, "powersave" and "performance". The default is "powersave", which seems suboptimal on a Desktop Xeon. The intel_pstate driver doesn't support manually pegging the clock, but the "performance" governor seems generous enough that it probably doesn't matter.
Installing cpufrequtils and then setting the governor in /etc/init.d/cpufrequtils to "performance" seemed to do the trick. You can get a live read on clock speeds with cpufreq-aperf, which should show all logical CPUs pegged to/near their max during a clobber build. Changing this seemed to take a clobber build from 8:45 to 8:30, though I didn't remeasure in powersave. HTH, bholley On Tue, Dec 13, 2016 at 6:31 AM, Ben Kelly <bke...@mozilla.com> wrote: > On Mon, Dec 12, 2016 at 8:44 PM, Gregory Szorc <g...@mozilla.com> wrote: > > > The Windows 10 power settings appear to set the minimum CPU frequency at > 5% > > or 10% of maximum. When I cranked this up to 100%, artifact build time > > dropped from ~170s to ~77s and full build configure dropped from ~165s to > > ~97s! > > > > If you are a Windows user with Xeons in your desktop, you may want to > visit > > Control Panel -> Hardware and Sound -> Power Options -> Edit Plan > Settings > > -> Change advanced power settings -> Process power management -> Minimum > > processor state and crank that up and see what happens. Note: running > your > > CPU at 100% all the time may impact your power bill! > > > > FWIW, in my windows 10 Control Panel -> Hardware and Sound -> Power Options > I had 3 preset power profiles: > > * Balanced (default selected) > * Power Saver > * Performance > > The "Balanced" profile has the 5% minimum clock speed. The "Performance" > profile set that to 100%. > > Ben > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
