[Beowulf] How to debug slow compute node?

[Lachlan Musicman]

On 12 August 2017 at 13:35, Chris Samuel <samuel at unimelb.edu.au> wrote:

> Also remember that the kernel can enable C states that hurt performance
> even
> if they are disabled in the BIOS/UEFI.   This was painfully apparent on our
> first SandyBridge cluster that almost failed the performance part of
> acceptance
> testing until it got found.
>
> Now we boot all nodes with this in the kernel cmdline:
>
> intel_idle.max_cstate=0 processor.max_cstate=1 intel_pstate=disable
>
>

Chris,

Can you point to some good documentation on this?

cheers
L.



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