Opened 5 years ago

Closed 5 years ago

#1413 closed help (answered)

Number of MPI tasks per node?

Reported by: swr04ojb Owned by: um_support
Component: UM Model Keywords:
Cc: Platform: ARCHER
UM Version: 8.5

Description

Hello,

am I correct in thinking that the recent upgrade to ARCHER moved the available MPI tasks per node from 12 to 24? I recently had to use the ARCHER compute costing calculator (for an nhpc) and I noted that it was cost-inefficient to only partially use nodes. Given that, should I be changing my HadGEM3 jobs from 12 MPI tasks per node to 24 MPI tasks per node? Are there (scientific) consequences for such a change?

kind regards,

Oliver

Change History (3)

comment:1 Changed 5 years ago by grenville

Oliver

There have always been a possible 24 MPI tasks per node on ARCHER. The upgraded machine is just 60% more of the same. The model should bit compare with the change you suggest.

Grenville

comment:2 Changed 5 years ago by swr04ojb

Thanks for clarifying that Grenville,
Oliver

comment:3 Changed 5 years ago by grenville

  • Resolution set to answered
  • Status changed from new to closed
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