On Tue, Apr 05, 2016 at 09:49:09AM +0530, Narsimha Reddy wrote:
>    Dear Sir,
>    Thank you for reply.
> 
>    But my requirement is to stop the backfilling and enable a pure FIFO model
>    in grid engine. In the above case it is should block the job 194 and allow
>    193 to get 1 more core to run the job.
> 
>    As mentioned in the mail i have verified the job with 4, 5 & 3 cores but
>    after submission of the job the 4 and 3 core jobs are submitted at a time
>    and 5 core is in qw till it gets 5 cores. This is normal grid engine
>    behavior, can we change this working.
> 
>    Can you let me know how to get it done.

Grid engine doesn't directly support disabling backfill.  You can
probably fake it by submitting jobs held and then using a cron job or
similar to ensure only one queued job (the oldest) has the hold released.
Be careful of job number wraparound.

Using documented methods AFAICT it is only possible to submit a job with
a user hold which the job owner can remove.  If you trust your users
this should be fine.  It might be possible to get the server side jsv
to add a system or operator hold but this is not a documented feature
and I've never tried.it myself.

William

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