To remain in eager mode you need to increase the size of
PSM2_MQ_RNDV_HFI_THRESH.
PSM2_MQ_EAGER_SDMA_SZ is the threshold at which PSM changes from PIO (uses the
CPU) to start setting SDMA engines. This summary may help:
PIO Eager Mode: 0 bytes -> PSM2_MQ_EAGER_SDMA_SZ - 1
SDMA Eage
Hi Matias,
Thanks a lot, that's very helpful!
What I need indeed is to always use eager mode. But I didn't find any
information about PSM2_MQ_EAGER_SDMA_SZ online. Would you please elaborate
on "Just in case PSM2_MQ_EAGER_SDMA_SZ changes PIO to SDMA, always in eager
mode."
Thanks!
Michael
On We
Hi Michael,
When Open MPI run on Omni-Path it will choose the PSM2 MTL by default, to use
the libpsm2.so. Strictly speaking, it has compatibility to run using the openib
BTL. However, the performance so significantly impacted that it is, not only
discouraged, but no tuning would make sense. Reg
