Hello Based on recent discussion about hwloc_topology_load() being slow on some "large" platforms (almost 1 second on KNL), here's a new feature proposal:
We've been recommending the use of XML to avoid multiple expensive discovery: Export to XML once at boot, and reload from XML for each actual process using hwloc. The main limitation is cgroups: resource managers use cgroups to restrict the processors and memory that are actually available to each job. So the topology of different jobs on the same machine is actually slightly different from the main XML that contained everything when it was created outside of cgroups during boot. So we're looking at adding a new topology flag that loads the entire machine from XML (or synthetic) and applies restrictions from the local/native operating system. Details at https://github.com/open-mpi/hwloc/pull/212 Comments welcome here or there. Brice _______________________________________________ hwloc-devel mailing list hwloc-devel@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/hwloc-devel
