Sub-blocking technique also for bg_size=128

Dear Users,

due to the wide utilization of the sub-blocking technique on FERMI, we would like to inform you that is now implemented

such modality also for an allocated block of 128 compute nodes (i.e. bg_size=128).

You are now able to launch multiple runs in both 64 or 128 compute nodes, by dividing it in smaller blocks:

1) for bg_size=64, in  32, 16, 8, 4, 2, 1 compute nodes,

2) for bg_size=128, in  64, 32, 16, 8, 4, 2, 1 compute nodes,

Due to this new implementation, the subblock module has been changed. If you are already using the sub-blocking technique, some modifications have to be done on your job script, mainly regarding 1) the path of source file;  2) the export of the new environment variable N_BGSIZE.

NOTE: From tomorrow, your old subblock-job script will not work anymore.

More informations can be found at the web page 

http://www.hpc.cineca.it/content/batch-scheduler-loadleveler-0#sub-block

Best Regards,

HPC-CINECA User Support