Grid engine queue slots
Configuring Queues. Queues are containers for different categories of jobs. Queues provide the corresponding resources for concurrent execution of multiple jobs that belong to the same category. In N1 Grid Engine 6, a queue can be associated with one host or with multiple hosts. A value of TRUE indicates that the Sun Grid Engine job script already contains one of the tasks of the parallel application (the number of slots reserved for the job is the number of slots requested with the -pe switch), while a value of FALSE indicates that the job script (and its child processes) is not part of the parallel program (the. job-ID prior name user state submit/start at queue slots ja-task-ID Sleeper jondoe r 03/10/ [email protected] 1 Note Betweenthestatesqw andr,thejobmaybeinstatet (transferring)forashorttimeor • qhost displays the status of Univa Grid Engine hosts, queues and jobs from the host perspective.
SGE queue states and state codes
Goldman Sachs related humor: How to Solve It by George Polya: It also defines how namy slots are availble on each host belonging to a queues. Compile the code using mpicc, mpicxx, mpif77, mpif90, etc. In slots parameter it is prudent always specify real number of cores for each host. Please note that this command-line switch will be removed from Grid Engine with the next major release.
Creating and modifying SGE Queues
A queue is a container for a class of jobs. It operates in conjunction with Parallel environment or set of parallel environments. Each queue has a name qname and the list of execution hosts hostlist.
List of execution hosts should be provided with spaces, not commas. It also defines how namy slots are availble on each host belonging to a queues. Slots are treated within each host as a consumable resource -- if job is scheduled on the particular host s , another job will be scheduled to a different hosts, unless this host still have required number of slots for another job. SGE creates one default queue during installation -- all. Other queues need to be created manually. Frequently used operations include:.
Excluding SGE queue from scheduling. The command qconf is used to configure and modify parameters of each queue. Among the most important parameters used:.
When you submit your job or script with qsub command SGE can check the list of requirements for particular job such as number of cores requested, amount of memory needed, run-time, etc. Then it will try to find all the machines which meets your requirements, and if there are more then necessary to run the job, remove any heavily-loaded machines from that list.
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The Sun Grid Engine queuing system is useful when you have a lot of tasks to execute and want to distribute the tasks over a cluster of machines. Using a queuing system in these situations has the following advantages:. You can run your tasks across the cluster in any way you see fit and the queuing system should not interfere.
However, you will most likely end up needing to implement the above features in some fashion in order to optimally utilize the cluster. A job in SGE represents a task to be performed on a node in the cluster and contains the command line used to start the task. A job may have specific resource requirements but in general should be agnostic to which node in the cluster it runs on as long as its resource requirements are met.
All jobs require at least one available slot on a node in the cluster to run. Submitting jobs is done using the qsub command. Notice that the qsub command, when successful, will print the job number to stdout.
From this output, we can see that the job is in the qw state which stands for queued and waiting. After a few seconds, the job will transition into a r , or running , state at which point the job will begin executing:.
Once the job has finished, the job will be removed from the queue and will no longer appear in the output of qstat:. Notice that Sun Grid Engine automatically named the job hostname and created two output files: The e stands for stderr and the o for stdout.
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