Ticket 2941 - intel_knl doc indicates asymmetric core layout for quadrant
Summary: intel_knl doc indicates asymmetric core layout for quadrant
Status: RESOLVED FIXED
Alias: None
Product: Slurm
Classification: Unclassified
Component: Documentation (show other tickets)
Version: 16.05.2
Hardware: Cray XC Linux
: 4 - Minor Issue
Assignee: Moe Jette
QA Contact:
URL:
Depends on:
Blocks:
 
Reported: 2016-07-26 12:04 MDT by Doug Jacobsen
Modified: 2016-07-26 13:02 MDT (History)
0 users

See Also:
Site: NERSC
Slinky Site: ---
Alineos Sites: ---
Atos/Eviden Sites: ---
Confidential Site: ---
Coreweave sites: ---
Cray Sites: ---
DS9 clusters: ---
Google sites: ---
HPCnow Sites: ---
HPE Sites: ---
IBM Sites: ---
NOAA SIte: ---
NoveTech Sites: ---
Nvidia HWinf-CS Sites: ---
OCF Sites: ---
Recursion Pharma Sites: ---
SFW Sites: ---
SNIC sites: ---
Tzag Elita Sites: ---
Linux Distro: ---
Machine Name:
CLE Version:
Version Fixed: 16.05.3
Target Release: ---
DevPrio: ---
Emory-Cloud Sites: ---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this ticket.
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