#1850: Severe performance problem on Stampede -------------------------+-------------------------------------------------- Reporter: hinder | Owner: Type: defect | Status: review Priority: major | Milestone: Component: SimFactory | Version: development version Resolution: | Keywords: -------------------------+--------------------------------------------------
Comment (by hinder):
Replying to [comment:30 dradice@…]:
Ian, yes please move the comments on SystemTopology and sorry for
hijacking your ticket! No problem - you were not the first person to raise the issue of activating SystemTopology automatically. I am not a proponent of that course of action (it cannot handle the machine-dependent case of socket affinity correctly, as this must be done before MPI_Init, and the core affinity is balanced automatically by the OS, giving a suboptimal but not terrible performance, and it is confusing when more than one simulation runs on a node), so if someone thinks it is a good idea, please create a ticket and include why you think this should be done.