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--- basic_usage_of_grid_engine_commands [2009/11/05 08:11]
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-== **Basic Usage of Grid Engine** ==
-**qstat - Show job/queue status**
-no arguments Show currently running/pending jobs
--f Show full listing of all queues
--j Shows detailed information on pending/running job
--U Shows current jobs by user
-qhost - Show job/host status
-no arguments Show a table of all execution hosts and information about their configuration
--l attr=val Show only certain hosts
--j Shows detailed information on pending/running job
--q Shows detailed information on queues at each host
-Using Grid Engine
-The main submit commands are qsub, qrsh and qtcsh. See the man pages for submit(1) and qtcsh(1) for more details.
-qsub - submit scripts
-Started with no arguments it accepts input from STDIN (^D to send submit input)
--cwd Run the job from the current working directory
-(Default: Home directory)
--v Pass the variable VAR (-V passes all variables)
--o Redirect standard output (Default: Home directory)
--e Redirect standard error (Default: Home directory)
-Example:
-qsub -cwd -v SOME_VAR -o /dev/null -e /dev/null myjob.sh
-In general, qsub is used for traditional batch submit, that is where I/O is directed to a file. Note that qsub only accepts shell scripts, not executable files.
-See the qsub(1) man page for more details.
-qrsh
-Qrsh acts similar to the rsh command, except that a host name is not given. Instead, a shell script or an executable file is run, potentially on any node in the cluster. I/O is directed back to the submitter's terminal window. By default, if the job cannot be run immediately, qrsh will not queue the job. Using the '-now no' flag to qrsh will allow jobs to queue. Note that I/O can be redirected with the shell redirect operators. For example, to run the uname -a command:
-qrsh uname -a
-The uname of some machine the scheduler selects in the cluster will then be displayed on the submitting terminal. To redirect the output,
-qrsh uname -a > /tmp/myfile
-The output from uname will be written to /tmp/myfile on the submitting host. To allow the command to queue:
-qrsh -now no uname -a
-If a suitable host is not immediately available the command will block until a suitable host is available. At that time, the command output will be displayed on the submitting terminal.
-See the qrsh(1) man page for more details.
-qtcsh
-Grid Engine contains a modified tcsh, qtcsh which will automatically submit jobs listed in a task file to the cluster. See the qtcsh(1) and qtask(5) man pages for more details.

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