Hello Erik, We need specific BGQ binding support, the binding API is different. Also we don't properly detect the 16 4-way cores properly, we only only 64 identical PUs. I am supposed to get a BGQ account in the near future so I hope I will have everything working in v1.7. Stay tuned 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
