The new "bgq" branch now contains proper topology for BG/Q nodes (including cores and caches, except the prefetching cache) as well as support for set/get binding of the current thread or of another thread. No process-wide binding since I don't know how to iterate over all threads of a process.
A tarball is available at: https://ci.inria.fr/hwloc/job/hwloc-zcustom-tarball/lastSuccessfulBuild/artifact/hwloc-1.7a1r5312.tar.gz (this is our new regression testing tool, I hope the tarball won't disappear too soon) I don't expect a lot more features so this branch will likely go into trunk very soon. But if you can look at it, that'll be great. Brice Le 08/01/2013 18:06, Erik Schnetter a écrit : > I am trying to use hwloc on a Blue Gene/Q. Building and installing > worked fine, and it reports the system configuration fine as well > (i.e. it shows all PUs). However, when I try to inquire the > thread/core bindings, hwloc crashes with an error in libc's free(). > This is both with 1.6 and 1.6.1rc1. > > The error occurs apparently in CPU_FREE called from > hwloc_linux_find_kernel_nr_cpus. > > Does this ring a bell with anyone? I know this is not enough > information to debug things, but do you have any pointers for things > to look at? > > I remember reading somewhere that the last bit in a cpu_set_t cannot > be used. A Blue Gene/Q has 64 PUs, and may be using 64-bit integers to > hold cpu_set_t data. Could this be an issue? > > My goal is to examine and experiment with thread/core bindings with > OpenMP to improve performance. > > -erik > > -- > Erik Schnetter <schnet...@gmail.com <mailto:schnet...@gmail.com>> > http://www.perimeterinstitute.ca/personal/eschnetter/ > > > _______________________________________________ > hwloc-users mailing list > hwloc-us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users
