[GE users] changing parameters while running...
jtseng at montalvosystems.com
Mon Aug 28 17:03:48 BST 2006
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There are two max job per user setting:
max_u_jobs: maximum number submitted - this is a sge qmaster restriction
maxujobs: maximum number of user jobs running. this is a scheduler restriction
Changing maxujobs (sched) has no affect on running jobs. The scheduler will simply notice the threshold is exceeded and not schedule any more jobs.
Changing max_u_jobs (queue) could prevent people from submitting more jobs.
Usually we don't limit max_u_jobs, but we change maxujobs as approrpriate.
One reason to change max_u_jobs (queue) is if you can't handle thousands of job in a scheduling cycle due to memory or cpu restrictions.
At that point, it would be best to move to a job task array to simplify scheduling, or have users self throttle their submissions.
The number of active (not finished) jobs which each Grid Engine user
can have in the system simultaneously is controlled by this parameter.
A value greater than 0 defines the limit. The default value 0 means
"unlimited". If the max_u_jobs limit is exceeded by a job submission
then the submission command exits with exit status 25 and an appropri-
ate error message.
Changing max_u_jobs will take immediate effect.
This value is a global configuration parameter only. It cannot be over-
written by the execution host local configuration.
The maximum number of jobs any user may have running in a Grid Engine
cluster at the same time. If set to 0 (default) the users may run an
arbitrary number of jobs
On Monday 28 August 2006 06:05, Davide Cittaro wrote:
> Hi there, I see there are people running their jobs on the little
> cluster... I have to change and reduce a value (max jobs/users) but I
> don't know what can happen now:
> [a] jobs running continue until their end (-> I can safely set it now)
> [b] some jobs will be stopped to satisfy the new parameter... (-> I
> have to wait the jobs to end)
> And yes, the number of jobs/user is now higher that the one I'm going
> to set set...
> Davide Cittaro
> HPC and Bioinformatics Systems @ Informatics Core
> IFOM - Istituto FIRC di Oncologia Molecolare
> via adamello, 16
> 20139 Milano
> tel.: +39(02)574303355
> e-mail: davide.cittaro at ifom-ieo-campus.it
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