[GE users] io usage always zero on Linux?

jallen at it.uts.edu.au jallen at it.uts.edu.au
Mon Nov 19 05:00:44 GMT 2007


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Thanks to everyone who provided feedback on this.  We have created an
issue and a proposed fix which we hope you would comment on (and perhaps
update or vote for) if you you are interested in allowing I/O usage
counting under Linux:

http://gridengine.sunsource.net/issues/show_bug.cgi?id=2429

  -- JA

> On Mon, Nov 12, 2007 at 03:54:01PM +0100, Andreas.Haas at Sun.COM wrote:
>
>> >You can get the total number and size of I/O operations for the system
>> >(using things like sar). If you have only one job slot per machine this
>> >might be sufficient as a metric.
>>
>> You mean context number of switches could be suited for measuring I/O
>> operations? Wouldn't ru_inblock/ru_oublock be better suited, if these
>> numbers were multiplied with the size of a block?
>
> Linux doesn't provide ru_inblock/ru_outblock, you always get zero.
>
> The sar tool (sysstat package) or even iostat can provide the
> total number of I/Os (or kilobytes) per second for a server.
> If you only run a single job per server then all I/O is generated
> by that single job and you can generate accounting data for it,
> e.g. by a load sensor.
>
> If you run multiple jobs in parallel it becomes difficult :)
> Still you could combine a single I/O bound job with jobs that
> do little I/O.
>
> Greetings,
> --
>                                 Michael van Elst
> Internet: mlelstv at serpens.de
>                                 "A potential Snark may lurk in every
> tree."
>
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