On 03/07/2017 11:10 AM, Boris Zbarsky wrote:
On 3/7/17 2:05 PM, Mike Conley wrote:
FWIW, the MOZ_MAKE_FLAGS bit can probably be removed, as I believe mach
will just choose the optimal number based on examining your processor
cores.
Except mach's definition of "optimal" is "maybe optimize for compile
throughput", not "optimize for doing anything else at all with your
computer while compiling".
I had to manually set a lower -j value than it was picking, because it
was impossible for me to load webpages (read: do reviews) or read
emails while a build was running, due to mach spawning too many jobs. :(
Now my builds are 1-2 minutes slower (read: 3-5%), but at least I can
get something else done while they're running.
I have at times spun off builds into their own cgroup. It seems to
isolate the load pretty well, when I want to bother with remembering how
to set it up again. Perhaps it'd be a good thing for mach to do
automatically.
Then again, if dropping the -j count buys you responsiveness for only a
3-5% loss, then perhaps cgroups are not worth bothering with.
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