Re: [Condor-users] Disk IO

[Diane Trout <diane@xxxxxxxxxxx>]

The way we tried to deal with that was by writing a small daemon and helper thatinjected the fileservers load into condor.

We then also modified the START conditional to make sure the fileservers load was reasonable.

# this condor block tries to grab the load information:
STARTD_CRON_JOBLIST = $(STARTD_CRON_JOBLIST) fileserver_load
STARTD_CRON_FILESERVER_LOAD_MODE = Periodic
STARTD_CRON_FILESERVER_LOAD_EXECUTABLE = /usr/bin/get_load
STARTD_CRON_FILESERVER_LOAD_ARGS = "-options"
STARTD_CRON_FILESERVER_LOAD_PERIOD=60s
STARTD_CRON_FILESERVER_LOAD_LOAD=1

# The start conditionals look like:
CpuBusy = ((LoadAvg / TotalCpus) > 1.5) || (fileserver_load > 9.0)

START=(CpuBusy == FALSE)

After implementing the above solution I then learned about the concurency limits which might also work.

http://research.cs.wisc.edu/condor/manual/v7.4/3_13Setting_Up.html#SECTION0041314000000000000000

In some magical land condor would be able to what file servers a job is hitting and throttle just those jobs.

On Thu, Jun 07, 2012 at 04:47:40PM -0400, Tiago Macarios wrote:
> Hi All,
>
> I have a particular problem, if someone could help me I would
> really appreciate.
> I have a condor pool of approx 30 machines, this machines run jobs that are
> disk and CPU intensive, but lately the jobs are more disk IO intensive than
> CPU intensive. This is causing some machines to actually IDLE while the
> disk is seeking. These machines can run 32 processes at a time, but
> currently I have to enforce a limit of 8 per machine (heuristic value),
> because of the disk.
>
> The machines already have 4 disks each. I was wondering if there is a way I
> could create a concurrency limit for disks and make condor copy and run the
> files on the different disks enforcing the 8 jobs per disk. The problem is
> that how can I get a variable that tells me which disk I should copy things
> to?
>
> Thanks,
>
> Mac.

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