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- 'jobname' is the name of the shell script, also called job, you want to submit.
- '-t time_in_seconds' specifies the wallclock time [in seconds] you acquire for the job. ("wallclock time" or "walltime" comes from "clock on the wall time" and is the "real" time that passes and not, for example, the cpu or system time.) Even if the job is not finished after this time expired the job will get terminated. So better always ask for enough time. However, on larger clusters like Compute Canada clusters jobs asking for more time will be queued longer.
On our UQAM systems the default wallclock time for single CPU/core jobs is 10 days. For multi core jobs the default time is 1 minute.
When running on clusters of The Alliance check out their wiki : Time limits on clusters of The Alliance - '-jn listing_name' specifies the name of the listing or log file of the job. Everything that would appear on the screen when running the job interactively will now get written into this file. The default listing name is the basename of the job.
- '-listing listing_directory' specifies the directory in which the listing will get written. The default directory is:
~/listings/${TRUE_HOST}
If you want to use the default listings directory, you should first create the directory ~/listings and then create a symbolic link inside that directory, pointing to a place where you have more space, for example to a directory (that you have to create!) under your data space:
mkdir -p /dataspace/Listings
mkdir ~/listings
ln -s /dataspace/Listings ~/listings/${TRUE_HOST}
Replace 'dataspace' with the full name of your data directory. - '-cpus number_of_cpus' specifies the number of cpus you want to use when running the job in parallel using MPI and/or OpenMP. The syntax is the following: MPIxOpenMP
For example, if you want to use 4 MPI processes and 2 OpenMP processes you would write: -cpus 4x2
If you want to use pure MPI with MPI=4 processes you would write: -cpus 4x1 or simply -cpus 4
If you want to use pure OpenMP with OpenMP=2 processes you would write: -cpus 1x2
The default is 1x1. - '-mpi' needs to get added when running a script (or the executable that will get executed within the script) with MPI.
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