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Status Future consideration
Workspace Spectrum Symphony
Components Version 7.3.2
Created by Guest
Created on Mar 6, 2024

RELATED IDEAS

CPU affinity as LSF or compatibility with taskset

Good afternoon,



we are currently working with MDS and multithreaded apps and have a question regarding cpu affinity or the possibility of adding specific information to taskset command while executing.



When we are using cpuLimits, we see it works great in terms of not allowing a total percentage use of cores superior to what we put in cpuLimit variable (which is correct).



So for example if i set cpuLimit to 2, on a 4 core machine I will see all 4 cores working at 50%. And if the same process executes on a 8 core machine, it will use 25% of 8 cores.



The issue we have is that this is not as good performance wise as stating taskset to cpu's 0 and 1 for example. In that case, cores 0 and 1 witll have 100% cpu and 0% for 2 and 3 for the 4 core machine, and on the 8 core machine, cores 0 and 1 will be at 100% and 2 to 7 at 0%.



Is there any way to either dynamically be able to set taskset to execute on cores depending on the cpuLimit of MDS configuration set? I cant directly specify 2 core to execute on cores 0 and 1, as if i launch another cpuLimit=2/MDS=ncpus=2 type, it will overlap. So it would be great to have the possibility, as with MDS i am indicating slots to use, to be able to bind thos slots to cpu's on server.



Or similar to as you have for LSF (https://www.ibm.com/docs/sk/spectrum-lsf/10.1.0?topic=affinity-binding-based-linux-cgroup-cpuset-subsystem), is there a way to set or define cpu affinity?



Thanks and best regards

Needed By Quarter

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