Difference: ZIVHPC:phi (5 vs. 6)

Revision 62013-11-13 - HolgerAngenent

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META TOPICPARENT name="ZIVHPC"

Using the Intel Xeon Phi accelerators

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Reserving nodes

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To use the accelerators, please reserve the nodes via the batch system. They have the property phi, so as an example use the batch file header
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To use the accelerators, please reserve the nodes via the batch system. Please use the queue "phi". For example, put the following lines in your submit file:
 
Changed:
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#pbs -l walltime=24:00:00,nodes=1:phi:ppn=8
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#pbs -l walltime=24:00:00,nodes=1:ppn=8 #pbs -q phi
 
Changed:
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or, for interactive use, run the command:
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or, for interactive sessions, use the queue "phi_interactive" and run the command:
 
Changed:
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qsub -I -l walltime=24:00:00,nodes=1:phi:ppn=8
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qsub -I -l walltime=1:00:00,nodes=1:ppn=8 -q phi_interactive
  (mind that the first I is a captial i)
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The nodes have 8 CPU cores and 4 accelerators, so please reserve two cores per accelerator you plan to use. If you did not reserve a whole node, please have a look at "pbstop", which cores you got and use the appropriate cards. For example, if the batch system gave you the last two cores, use mic3.

Restrictions:

  • The maximum walltime of phi is limited to 24 hours
  • If you want to reserve both nodes, only 12 hours are feasible
  • phi_interactive is limited to 8 hours walltime
 

Compiling code for the accelerators

Code for Xeon Phis can only be compiled on the nodes phi1 and phi2, so please use a batch session for this purpose.

 
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