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Number crunching :
which CPU extension in use for which sub-projects?
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Send message Joined: 18 Dec 15 Posts: 1686 Credit: 100,340,801 RAC: 101,857 |
the recent introduction of use of AVX code for some Sixtrack WUs leads me to the question as to whether Sixtrack would now be the only LHC subproject making use of AVX (besides SSE2), or whether the other subprojects, running as VM, are already using AVX. If not, any idea which extensions (maybe newer ones than SSE2) are being used for the various projects? |
Send message Joined: 18 Dec 15 Posts: 1686 Credit: 100,340,801 RAC: 101,857 |
none of the mods or anyone else any idea? |
Send message Joined: 15 Jun 08 Posts: 2386 Credit: 222,898,251 RAC: 138,251 |
the recent introduction of use of AVX code for some Sixtrack WUs leads me to the question as to whether Sixtrack would now be the only LHC subproject making use of AVX (besides SSE2), or whether the other subprojects, running as VM, are already using AVX. If not, any idea which extensions (maybe newer ones than SSE2) are being used for the various projects? I'm not quite sure what you expect. 1. An AVX version of the vbox wrappers? 2. AVX versions of the scientific apps inside the VMs? (1) Makes no sense as there are not much floating point calculations to be done by the wrappers. (2) Could make sense under certain prerequisits but those apps would be integrated in the downloads at the beginning of a job. Perhaps your VMs already use AVX apps. Cheers |
Send message Joined: 29 Aug 05 Posts: 997 Credit: 6,264,307 RAC: 71 |
As far as I know, CMS software does use AVX, because when we benchmarked our stuff on a Knight's Landing cluster it was stated that we might have got better performance if we'd recompiled to make use of its AVX512 instructions instead of the AVX256 default. At that time no standard CPU had AVX512, but that has now changed of course. |
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