On 2016.02.12 at 08:58 +0100, Bastian Bittorf wrote: > * Stefan Ring <stefan...@gmail.com> [10.02.2016 11:41]: > > Unfortunately, process priority is absolutely worthless on machines > > with hyperthreading. The other day I witnessed someone using all 64 > > virtual cores of gcc110 (the POWER7 machine), and it was godawfully > > slow to work with. > > > > My rule of thumb is to leave at least one physical core free in order > > to not disturb other users. So if the machine is 8x8 core (8 physical, > > 8x HT -- I don't know the real topologies of these POWER machines), I > > strive to use at most 7 cores. > > this is interesting. till now i always invoked a build with: > > #!/bin/sh > jobs=$( grep -sc ^'processor' /proc/cpuinfo ) > jobs=$(( $( cpu_count ) + 1 )) > > make --jobs $jobs > > so should i change that to -2 ?
You should change that to "/ 2" at least. From https://gcc.gnu.org/wiki/CompileFarm «For automatic jobs on N-core please launch no more than N/2 runnable processes (total)« -- Markus _______________________________________________ Gcc-cfarm-users mailing list Gcc-cfarm-users@gna.org https://mail.gna.org/listinfo/gcc-cfarm-users
