Users’ General FAQs

Q: What is the difference between my Home Site and my Execution Site

Your Home Site is a PRACE site which will assist with your account creation, acquiring a certificate and acts as a contact during your project. Your Execution Site is where your jobs will run. Each project may have more than one Execution Site. Typically, your Home Site is not one of your Execution Sites.

Q: How do I access my Execution Site using the PRACE network or my personal laptop?

The answer may be found here. Alternatively, you may ask the Helpdesk for assistance.

Q: How do I submit a question for support?

Rather than submitting queries to an individual PRACE site, we strongly recommend using the PRACE Helpdesk. For more details, please visit PRACE Helpdesk Guide.

Q: May I contact my Execution Site directly?

Please do not contact your Execution Site directly. Instead, please communicate via the PRACE Helpdesk). For more details, please visit PRACE Helpdesk Guide.

Q: How can I check how many hours I have consumed?

You can check how many hours you have consumed using the PRACE Accounting Reporting Tool (DART).

For more information and for the DART FAQ, please visit Account Reporting Tool documentation

NB Some PRACE sites do report usage figures using their own tools elsewhere; however, the only official source of PRACE accounting data is given by the DART.

Q: I have platform-specific questions and problems: where can I find local documentation?

There is a link to each sites’ local User Documentation via PRACE’s Interactive Access User Document at this link.

Q: How do I submit a job?

This is described in PRACE’s Batch System User Document, which is available via this link

Q: How do I increase my file space or the limit on the total number of files?

Please contact the Helpdesk who will then investigate the possibility of increasing your disc allocation at your Execution Site(s).

Q: Which non-PRACE tools are available on my Execution Site?

There is a link to each sites’ local User Documentation via PRACE’s Interactive Access User Document at this link, where such tools will be described.

Q: How to convert binary files from little endian to big endian and visa-versa on an IBM BlueGene platform?

You can use the environment variable XLFRTEOPTS; however this does not work with files generated via MPI-IO. If you want to read or write a file in LittleEndian on unit 12 of an IBM BlueGene:

BlueGene>mpixlf90_r -o little_endian little_endian.f90
BlueGene>bgrun -np 64 -mode VN -env "XLFRTEOPTS=ufmt_littleendian=12" -exe little_endian

Q: At the end of the project, how long do I have access to my data?

Typically, each project is given up to 3 months to remove their data from their Execution Site(s), however this should be confirmed with your Home Site.

Q: My registration information has changed (this may be your name, address, affiliation, e-mail, telephone number, etc). Should I tell PRACE?

Please inform PRACE via the Helpdesk.

Q: How should I acknowledge PRACE?

If you publish results which are derived from work performed using PRACE resources, then please reference PRACE in the following manner: "This work was granted access to the HPC resources of [Name of the Contributor/Name of the Tier-1 site] made available within the Distributed European Computing Initiative by the PRACE-2IP, receiving funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement RI-283493." Finally, please inform PRACE so that we may include a reference to your publication in our website.