Resolve "Romeo SMT enabled by default?"

Closes #476 (closed)

To get 256 cores per node --hint=multithread has to be specified or SLURM returns salloc: error: Job submit/allocate failed: Requested node configuration is not available This shows SMT is diabled per default and has to be enabled by the user

Furthermore I added a note how to activate SMT on alpha partition similar to romeo

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assigned to @rotscher--tu-dresden.de

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• 53f803da - add how to enable smt on alpha

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Then we should change it in both cases. Any suggestion on how to say it is disabled per default?

Like this it should be fine: You mentioned it on the AMD Rome page as the first note - this is good.
On this page it should not be too much detail. Hence 'available' fits well in my eyes. For me the terms mean
"disabled": has been turned off by the admins, is not possible to get on the specified partitions.
"enabled": is active and turned on (definition: "aktiviert", "betriebsbereit", "aktiv")
"available": is configured and can be used, but requires action (definition: "erhältlich", "verfügbar", "vorhanden")

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• 56302891 - fix smt is diabled on remeo
• df6d0740 - add how to enable smt on alpha

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• 4cb1e902 - fix smt is available on remeo
• 4f92e737 - add how to enable smt on alpha

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Es ist sowohl auf der Partition romeo* als auch alpha* SMT verfügbar, jedoch muss man bei den Parametern aufpassen. Da wir auf den Login-Knoten SLURM_HINT=nomultithread gesetzt haben, gibt es zwei Wege.

1. Für sbatch:
   1. unset SLURM_HINT
   2. --slurm-hint=multithread im Batch-Skript nutzbar
2. Für srun und salloc kann man den Parameter --slurm-hint=multithread benutzen

Beide Methoden sollten in den betreffenden Unterseiten bereits angegeben sein.

Das Unerwartete ist hier, das im sbatch Skript--hint=multithread die Umgebungvariable nicht überschreibt. D.h., ob das Script überhaupt ausführbar ist, hängt von der Umgebung des Nutzers ab.

Laut DOKU wird --hint höher nur höher eingestuft als SLURM_HINT, wenn es tatsächlich als command line argument mitgegeben wird: sbatch --hint=multithread <sbatch.script>. Die Angabe, dass man mit --hint=... im sbatch Skript SMT genutzt werden kann, ist daher falsch.

--hint=<type>
    Bind tasks according to application hints.
    NOTE: This option cannot be used in conjunction with --ntasks-per-core, --threads-per-core
or -B. If --hint is specified as a command line argument, it will take precedence over the
 environment.

Man kann auch immer die Umgebungsvariable mit export SLURM_HINT=multithread überschreiben.

requested review from @rotscher--tu-dresden.de

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• 6fb054ad - Add SMT usage to Slurm page

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• 0d905d81 - Fix typos

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requested review from @s8916149--tu-dresden.de and removed review request for @rotscher--tu-dresden.de

assigned to @mflehmig--tu-dresden.de and unassigned @rotscher--tu-dresden.de

approved this merge request

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merged

mentioned in commit ea67e57b