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. (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
