[Beowulf] LSI Megaraid stalls system on very high IO?

[John Hearns]

In addition to the suggestions above I would look at the memory usage
pattern while the IO is going on

watch  cat /proc/meminfo

This system might have a decent amount of memory - but are the sysctl
tunings for the dirty buffer sizes set small or something?


On 2 August 2014 04:17, Chris Samuel <samuel at unimelb.edu.au> wrote:

> On Fri, 1 Aug 2014 03:13:39 PM mathog wrote:
>
> > That may fix the problem but I am still curious about exactly what
> > happened during the terminal stalls.   Using the current cfq scheduler
> > what is going on in the system that is keeping those terminal processes
> > from getting any CPU time?
>
> Not entirely sure, but you may get some idea with latencytop *if* it is
> able
> to get some time to run to return info.
>
> cheers,
> Chris
> --
>  Christopher Samuel        Senior Systems Administrator
>  VLSCI - Victorian Life Sciences Computation Initiative
>  Email: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545
>  http://www.vlsci.org.au/      http://twitter.com/vlsci
>
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