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Answers to frequently asked questions

Information

If you experience a problem using our resources and have not been able to find a solution in this section, please contact us by PLGrid Helpdesk.

Can I use the PLGrid infrastructure?

PLGrid resources are available to all persons working in Polish research units, as well as students, PhD students and people collaborating with Polish researchers, including retirees and foreigners.

Is PLGrid free of charge?

Users take advantage of PLGrid free of charge. The amount of resources allocated is determined by our experts who review your application. However, as part of the grant application settlement, we would ask you to ensure that publications created using the infrastructure (including post-conference publications and theses) include the following Acknowledgements to PLGrid.

I am not employed at a Polish university, but I conduct research. How do I get access to PLGrid?

You can find a Supervisor – a researcher employed at a Polish research unit. Discuss the details of the cooperation with him/her and then apply for External collaborator affiliation.

I cannot log into a cluster, though I already have a computing grant

It is most likely that you do not yet have an active access service. Apply for the access service to a specific supercomputer in the PLGrid Portal, in the Services tab.

My affiliation is not active

If your affiliation is no longer active, it has probably not been extended on time. Read the information on affiliation extension. If you are still authorized to use PLGrid, but your affiliation has not been renewed in time, please contact us via Helpdesk.

I cannot see my home directory on the cluster

If you are our new user, please wait approximately one hour before all your account information propagates on the cluster.

I keep getting the message "invalid login" or "invalid password"

Make sure you already have a user account in PLGrid and enter the correct login (with the "plg" prefix). If you have forgotten your password, you can reset it by entering the email address you used when registering to PLGrid.

When I try to execute a script on the cluster, I get an error FATAL: permission denied

Grant the script/program the rights to be executed using the command:

chmod u+x <full_script_name>

This should solve the problem.

My jobs are waiting very long to be started – why?

You can check the expected start time for a job with the squeue command. This time will only be visible if your job is already scheduled by the SLURM system to run on the cluster.

squeue -t pd -o %i,%S

There are many users working on the cluster, making it impossible to determine the exact start time of a job, as it may happen that another job has a higher priority than yours. The priority of a job depends on many factors, such as the size and execution time limit of the job or the extent of the computing grant.

I cannot perform calculations on the cluster, although I have an active grant and previously everything worked properly (message sbatch: error: Batch job submission failed: Invalid account or account/partition combination specified)

This error may be due to exceeded (exhausted) grant resources. In the case of Ares and Athena clusters, you can check this with the command

hpc-grants

If the allocation status of your grant is indicated here as exhausted, the grant resources have already been fully consumed. In this case you can apply for a new grant or renegotiate the current one with a request for additional resources.


Last update: January 30, 2024