[Beowulf] LSI Megaraid stalls system on very high IO?
hearnsj at googlemail.com
Fri Aug 1 23:10:21 PDT 2014
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
> to get some time to run to return info.
> 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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