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Hopper Featured Announcements

Hopper batch walltime increase and new xfer queue

June 29, 2011 by Helen He | 0 Comments

There are two batch queue configuration changes on Hopper:

1) User jobs using fewer than 4,096 nodes can now run for up to 36 hrs.  In particular, the max wall time limits for reg_small (1-683 nodes), reg_med (684-2,048 nodes), and reg_big (2,049-4,096 nodes) jobs have been increased from 24 to 36 hrs.

2) A new "xfer" queue has been introduced. Users can use the xfer job to pre-stage input files for a large simulation and archive output files afterwards without the penalty of being charged for the large amount of compute nodes during the file transfers.  

The xfer queue on Hopper is being implemented on a local batch server (hopper06), which is separate from the main batch server on the main Hopper XE.  So there are some special notes about the xfer jobs, for example: their job ids are in a different format (such as 6000345.hopper06), and since xfer jobs do not use any compute nodes, the torque keyword "mppwidth" should not be specified in an xfer batch script.

The details of the batch queue configuration can be found at:
http://www.nersc.gov/users/computational-systems/hopper/running-jobs/queues-and-policies/

And the details of submitting an "xfer" job can be found at:
http://www.nersc.gov/users/computational-systems/hopper/running-jobs/batch-jobs/#xfer

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Hopper $SCRATCH2 now available

June 21, 2011 by Helen He | 0 Comments

$SCRATCH2 file system on Hopper is available again after the file system reformat and IO testing. Thank you very much for your patience during this work. It is lightly used compared to $SCRATCH, so you are encouraged to use this file system, especially for users who have a lot of data.

More details on various file systems available on Hopper can be found at:
http://www.nersc.gov/users/computational-systems/hopper/file-storage-and-i-o/

Please report any problems to consult at nersc dot gov.

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Workshop on Cray XE6 User Experiences September 27-28

June 20, 2011 by Helen He | 0 Comments

Sandia National Laboratory and Cray Inc are hosting a Workshop on Cray XE6 User Experiences in Albuquerque, New Mexico, on September 27 -28, 2011.  The workshop will focus on:

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Hopper batch queue boundary changes and 25% discount for reg_med

June 17, 2011 by Francesca Verdier | 0 Comments

Effective immediately, the following changes to the Hopper batch queue boundaries (affecting reg_med, reg_short, reg_small, and low queues only) have been made, and a 25% charging discount to reg_med queue is now applied.

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Reformatting $SCRATCH2 this Thursday -- Files DELETED

June 14, 2011 by Helen He | 0 Comments

As announced last week, $SCRATCH2 file system on Hopper will be reformatted starting 6am Pacific time this Thursday, June 16.  ALL files will be DELETED. The file system is expected to be unavailable throughout the weekend.  There will be a short period of time for dedicated IO testing, when the batch queues will be stopped.  The login nodes will be available continuously.

We will send out another notice when $SCRATCH2 file system is available to use again.

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