What processor and kernel is this? (see /proc/cpuinfo, or run "lstopo -v" and look for attributes on the Socket line) You're hwloc output looks like an Intel Xeon Westmere-EX (E7-48xx or E7-88xx). The likwid output is likely wrong (maybe confused by the fact that hardware threads are disabled).
Brice Le 07/11/2012 21:56, Blosch, Edwin L a écrit : >>>> In your desired ordering you have rank 0 on (socket,core) (0,0) and >>>> rank 1 on (0,2). Is there an architectural reason for that? Meaning >>>> are cores 0 and 1 hardware threads in the same core, or is there a >>>> cache level (say L2 or L3) connecting cores 0 and 1 separate from >>>> cores 2 and 3? > My thinking was that each MPI rank will be running 2 OpenMP threads and that > there might be some benefit to having those threads execute on cores 0 and 1 > because those cores might share some level of the memory hierarchy. No > hardware threading is being used. > >>>> hwloc's lstopo should give you that information if you don't have that >>>> information handy. > Here you go, first likwid output then hwloc, just for the first socket. > > likwid output: > ************************************************************* > Graphical: > ************************************************************* > Socket 0: > +-----------------------------------------------------------------------------------------------------+ > | +-------+ +-------+ +-------+ +-------+ +-------+ +-------+ +-------+ > +-------+ +-------+ +-------+ | > | | 0 | | 1 | | 2 | | 3 | | 4 | | 5 | | 6 | | 7 > | | 8 | | 9 | | > | +-------+ +-------+ +-------+ +-------+ +-------+ +-------+ +-------+ > +-------+ +-------+ +-------+ | > | +-----------------+ +-----------------+ +-----------------+ > +-----------------+ +-----------------+ | > | | 32kB | | 32kB | | 32kB | | 32kB > | | 32kB | | > | +-----------------+ +-----------------+ +-----------------+ > +-----------------+ +-----------------+ | > | +-----------------+ +-----------------+ +-----------------+ > +-----------------+ +-----------------+ | > | | 256kB | | 256kB | | 256kB | | 256kB > | | 256kB | | > | +-----------------+ +-----------------+ +-----------------+ > +-----------------+ +-----------------+ | > | > +-------------------------------------------------------------------------------------------------+ > | > | | 30MB > | | > | > +-------------------------------------------------------------------------------------------------+ > | > +-----------------------------------------------------------------------------------------------------+ > > hwloc output: > > Machine (512GB) > NUMANode L#0 (P#0 64GB) + Socket L#0 + L3 L#0 (30MB) > L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 + PU L#0 (P#0) > L2 L#1 (256KB) + L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 + PU L#1 (P#1) > L2 L#2 (256KB) + L1d L#2 (32KB) + L1i L#2 (32KB) + Core L#2 + PU L#2 (P#2) > L2 L#3 (256KB) + L1d L#3 (32KB) + L1i L#3 (32KB) + Core L#3 + PU L#3 (P#3) > L2 L#4 (256KB) + L1d L#4 (32KB) + L1i L#4 (32KB) + Core L#4 + PU L#4 (P#4) > L2 L#5 (256KB) + L1d L#5 (32KB) + L1i L#5 (32KB) + Core L#5 + PU L#5 (P#5) > L2 L#6 (256KB) + L1d L#6 (32KB) + L1i L#6 (32KB) + Core L#6 + PU L#6 (P#6) > L2 L#7 (256KB) + L1d L#7 (32KB) + L1i L#7 (32KB) + Core L#7 + PU L#7 (P#7) > L2 L#8 (256KB) + L1d L#8 (32KB) + L1i L#8 (32KB) + Core L#8 + PU L#8 (P#8) > L2 L#9 (256KB) + L1d L#9 (32KB) + L1i L#9 (32KB) + Core L#9 + PU L#9 (P#9) > > Thanks again > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
