Month: Apr 2014

Computational hours and MPI issues

application, hpc, MPI
Our clusters are currently computing more active hours that were processed in the first two years in total. Today we exceeded 300,000 CPU hours of work, that's more than 34 computational years being processed currently.   cumulative There are several MPI…
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Why are my jobs queuing?!?

hardware, hpc, maui, torque
Quite simply, our cluster is running at almost maximum capacity, and there's not much we can do about that.  It's always nice to be wanted though :-) Our strategy to deal with this is three-fold: 1) Shuffle user priorities to…
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Quantum Espresso

application, hpc
For the chemistry users out there, we've installed Quantum Espresso, an integrated suite of Open-Source computer codes for electronic-structure calculations and materials modeling at the nanoscale. It is based on density-functional theory, plane waves, and pseudopotentials.QE…
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Dealing with the pbs_server qstat bug

hpc, torque
Occasionally we need to restart the pbs_server daemon on our clusters to implement config changes, such as adding text tags in our previous post.  There is a bugfeature in PBS such that after issuing a restart of pbs_server, CPU times…
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Differing node patch levels

torque
Nodes 600 to 603 are SLES SP2, nodes 604 to 607, 700, 701 and 800 are SLES SP3.  To ensure that users submitting MPI jobs reference consistant libraries we've added SP2 and SP3 as text tags to the nodes file.  …
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Advance notification of downtime

hpc
Advance notification of downtime, June 2014: Please be aware that the ICTS HPC clusters (Hex, Hpc and Grid) will be shut down on the weekend of the 21-22 June 2014 for data center maintenance.  All jobs must be stopped or…
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