On Tue, Oct 20, 2015 at 5:52 PM, Ramana Radhakrishnan <raman...@gmail.com> wrote: > 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've now fixed the wiki page - it was my misunderstanding. Ramana _______________________________________________ Gcc-cfarm-users mailing list Gcc-cfarm-users@gna.org https://mail.gna.org/listinfo/gcc-cfarm-users
