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QGIS: Difference between revisions
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Never make intense use of QGIS on the login nodes! Submit jobs using the command line whenever possible and if you must visualize your data using the GUI, please do so on an interactive node. Using parallel rendering on the shared login nodes will result in the termination of your session. | Never make intense use of QGIS on the login nodes! Submit jobs using the command line whenever possible and if you must visualize your data using the GUI, please do so on an interactive node. Using parallel rendering on the shared login nodes will result in the termination of your session. | ||
== | == Loading QGIS == | ||
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You will first need to load gcc | You will first need to load gcc | ||
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}} | }} | ||
====Command-line QGIS==== <!--T:31--> | |||
You can execute QGIS by running a Python script: | |||
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{{Command| | {{Command|python qgis_code.py}} | ||
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1. Place your python code in a script file, in this case the [https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/intro.html file] is called ''qgis_code.py''. | |||
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{{File | |||
from qgis.core import * | |||
# supply path to qgis install location | |||
QgsApplication.setPrefixPath("/path/to/qgis/installation", True) | |||
# create a reference to the QgsApplication, setting the | |||
# second argument to False disables the GUI | |||
qgs = QgsApplication([], False) | |||
# load providers | |||
qgs.initQgis() | |||
# Write your code here to load some layers, use processing | |||
# algorithms, etc. | |||
# When your script is complete, call exitQgis() to remove the | |||
# provider and layer registries from memory | |||
qgs.exitQgis() | |||
}} | |||
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2. Copy the following content in a job submission script called ''job.sh'': | |||
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{{File | |||
|name=job.sh | |||
|lang="bash" | |||
|contents= | |||
#!/bin/bash | |||
#SBATCH --account=def-someacct # replace this with your own account | |||
#SBATCH --ntasks=1 # number of MPI processes | |||
#SBATCH --mem-per-cpu=2048M # memory; default unit is megabytes | |||
#SBATCH --time=0-00:15 # time (DD-HH:MM) | |||
module load gcc | |||
module load qgis | |||
python qgis_code.py | |||
}} | |||
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3. Submit the job with: | |||
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<source lang="bash"> | |||
sbatch job.sh | |||
</source> | |||
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For more on submitting jobs, see the [[Running jobs]] page. | |||