Ticket 2941

Summary:	intel_knl doc indicates asymmetric core layout for quadrant
Product:	Slurm	Reporter:	Doug Jacobsen <dmjacobsen>
Component:	Documentation	Assignee:	Moe Jette <jette>
Status:	RESOLVED FIXED	QA Contact:
Severity:	4 - Minor Issue
Priority:	---
Version:	16.05.2
Hardware:	Cray XC
OS:	Linux
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Description Doug Jacobsen 2016-07-26 12:04:51 MDT

Hello,

There is a special note in the intel_knl documentation that indicated that quadrant mode has asymmetric core layouts and that slurm would be limited to 256 threads in snc4 and quadrant modes.

It appears that quadrant does have symmetric numa modes and that all threads are accessible.  (e.g., slurm detects all 272 and each of 272 mpi tasks are locked to different cpus).

Thanks,
Doug

Comment 2 Moe Jette 2016-07-26 12:24:42 MDT

That is old documentation based upon early KNL prototypes with 68 cores (which caused all sorts of problems). Thanks for pointing this out. I'll update the documentation.

Comment 3 Moe Jette 2016-07-26 13:02:27 MDT

Thanks for pointing this out. The documentation has been updated in this commit: 
https://github.com/SchedMD/slurm/commit/3766b05e22cb87e4e81b9ca4076b81804db3ad39