On Sun, Oct 18, 2015 at 5:25 PM, Torbjörn Granlund <t...@gmplib.org> wrote: > Segher Boessenkool <seg...@kernel.crashing.org> writes: > > On Sun, Oct 18, 2015 at 05:30:28PM +0200, Torbjörn Granlund wrote: > > Laurent GUERBY <laur...@guerby.net> writes: > > > > We're pleased to announce that four new servers running AArch64 8 core > > processors are now available in the GCC compile farm (1): gcc113 to > > gcc116.fsffrance.org. The machines have been donated by ARM (2) hosted > > and configured by OSUOSL (3). > > > > Nice. > > > > Which processor core do these use? > > APM X-Gene "Potenza". > > > I tried to figure this out with some searches, but alas I came up with > > no information. > > xxd /proc/device-tree/cpus/cpu@000/compatible > > > Specifically, is it Cortex-A53, A57, or A72, or is it some independently > > developed core? > > > > It is clear the the CPUs run at 2.4 GHz and not 1.6 GHz as > > https://gcc.gnu.org/wiki/CompileFarm claims. > > That isn't clear at all; what test did you use? > > A tight loop in assembly code. Aside from loop control, I use a > dependent chain of plain instructions, and measure the delta as I change > the count of dependent instructions. > > Modern pilelines are complex, so the counts might fluctuate bit. These > didn't; 3 dependent instructions took 3 2.4 GHz cycles, 4 dependent > instructions took 4 2.4 GHz cycles, etc.
I remember being told these were 1.6GHz machines when we arranged for these to be delivered - will double check. I plan to set up armhf chroots in the coming weeks (read spare time) that developers can access using schroot on these machines as this would give folks access to a fast machine for aarch32 development too. Do people feel strongly against doing so ? Thanks, Ramana > > (To exclude zany "Turbo" modes, I loaded all 8 cores.) > > > -- > Torbjörn > Please encrypt, key id 0xC8601622 > > _______________________________________________ > Gcc-cfarm-users mailing list > Gcc-cfarm-users@gna.org > https://mail.gna.org/listinfo/gcc-cfarm-users _______________________________________________ Gcc-cfarm-users mailing list Gcc-cfarm-users@gna.org https://mail.gna.org/listinfo/gcc-cfarm-users
