[Beowulf] How to debug slow compute node?

Lachlan Musicman datakid at gmail.com
Sun Aug 13 15:17:38 PDT 2017

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


Can you point to some good documentation on this?


"The antidote to apocalypticism is *apocalyptic civics*. Apocalyptic civics
is the insistence that we cannot ignore the truth, nor should we panic
about it. It is a shared consciousness that our institutions have failed
and our ecosystem is collapsing, yet we are still here — and we are
creative agents who can shape our destinies. Apocalyptic civics is the
conviction that the only way out is through, and the only way through is
together. "

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