Hi Jed, Thanks for the reply and suggestion. I tried adding -mca yield_when_idle 1 (and later mpi_yield_when_idle 1 which is what ompi_info reports the variable as) but it seems to have had 0 effect. My master goes into fftw planning routines for a minute or so (I see the threads being created), but the overall usage of the slaves remains close to 100% during this time. Just to be sure, I put the slaves into a MPI_Barrier(MPI_COMM_WORLD) while they were waiting for the fftw planner to finish. It also didn't help.
Do you know where is yield_when_idle documented? David On Wed, 2010-07-21 at 20:24 +0200, Jed Brown wrote: > On Wed, 21 Jul 2010 14:10:53 -0400, David Ronis <david.ro...@mcgill.ca> wrote: > > Is there another MPI routine that polls for data and then gives up its > > time-slice? > > You're probably looking for the runtime option -mca yield_when_idle 1. > This will slightly increase latency, but allows other threads to run > without competing with the spinning MPI. > > Jed >
