processor affinity

Open MPI: Binding to core by default

2 min read

After years of discussion, the upcoming release of Open MPI 1.7.4 will change how processes are laid out (“mapped”) and bound by default.  Here’s the specifics: If the number of processes is <= 2, processes will be mapped by core If the number of processes is > 2, processes will be mapped by socket Processes […]

EuroMPI’13 Cisco slides: Open MPI Process Affinity User Interface

1 min read

The slides below are from my presentation at EuroMPI’13 about Open MPI’s flexible process affinity interface (in OMPI 1.7.2 and later).  I described this system in a prior blog entries (one, two, three), but many people keep asking me about it. Josh Hursey from U. Wisconsin, LaCrosse, wrote this IMUDI paper about the interface (IMUDI […]