The Supercomputer MACH-2

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Job Submission

PBSPro (Portable Batch System) is used as the HPC Workload Manager and takes care of the job scheduling. Users prepare their program runs on MACH-2's frontend node and submit the jobs to MACH-2 for execution. The details on how to connect to MACH's login node get communicated upon grant of a new user account ad personam.

The main PBSPro Commands are:

Please consult the Linux manual pages on the Login Node for the available command line switches. Detailed information is available in the User Guide.


Available Resources

The command pbsnodes mach2 shows the resources currently configured to the Workload Manager PBSPro:
otto@lotte:~>  pbsnodes  mach2
     resources_available.arch = linux_cpuset = mach2
     resources_available.mem = 20347869088kb
     resources_available.ncpus = 1716
Hence, MACH-2 is able to cope with a job submitted the way:
otto@lotte:~>  qsub  -I  -q f2800  -l select=mem=20347869088kb 
and allows you to use some 19,405 GigaBytes of RAM in a single Linux process address space!


Exemplary Job Run

Storyboard: Test user otto is logged in to MACH-2's frontend; and in the project working directory ~/mach2-home/MPI_ex1/ he will compile and run the sample MPI example program example-compute-pi.c by The Argonne Labs.


Disk Space

... is always a scarce resource.

MACH-2 is meant to be used as a Compute Server only. The built in filesystems shall not serve as a file archive. The mindful users take care of the data management themselves and will save away (transfer to the storage facilities at the home department) or clean up used storage space as frequently/soon as possible. On MACH-2, there is no backup mechanism in place—hence: Caveat Emptor! Whenever the storage subsystem breaks due to a serious failure, system operation might have to restart from tabula rasa (i.e. from scratch). Users are asked to inspect the file data items stored underneath: $HOME ("~/mach2-home/") and $SCRATCHDIR ("~/mach2-scratch/"), respectively, on a regular basis and to free up storage space as often and as early as possible. Thanks!

Available Filesystems:


JKU Scientific Computing Administration