Difference between revisions of "UCVM on Compute Nodes"

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* HPC Center's don't like programs running on headnode
 
* HPC Center's don't like programs running on headnode
  
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== Method 1 - Allocation Interactive Compute Nodes ==
 
Information To Prepare:
 
Information To Prepare:
 
* scalloc - command that will reserve a dedicated compute node for your program.  
 
* scalloc - command that will reserve a dedicated compute node for your program.  

Revision as of 03:51, 26 April 2021

Examples of running UCVM Query on compute nodes on Discovery

Running on dedicated compute nodes

Reasons for using compute nodes

  • login (headnode) is shared by all users.
  • compute nodes are dedicated to your job (while in use) and not shared
  • HPC Center's don't like programs running on headnode

Method 1 - Allocation Interactive Compute Nodes

Information To Prepare:

  • scalloc - command that will reserve a dedicated compute node for your program.
    • Using dedicated worker nodes should let your program run faster than shared headnode
  • Number of tasks - typically 1 unless running MPI codes
  • Expected max duration of program : Format HH:MM:SS
    • Longer runtimes can
    • HPC systems typically have max runtime (e.g. 24:00:00 or 48:00:00).
    • Must make arrangements with HPC system operates for longer runtimes
  • allocation account - who's allocation will be charged for computing time
    • CARC offers "no-cost" allocations to University researchers that request them
    • Allocation will also include dedicated disk storage on CARC /project filesystem (e.g. /project/maechlin_162 /project/scec_608)

Example command for running program on discovery:

  • This reserves a single compute node, for 1 hour, using SCEC allocation
%salloc --ntasks=1 --time=1:00:00 --account=scec_608

Example profile query

%ucvm_query -f /project/scec_608/<username>/ucvm_bin/conf/ucvm.conf -m cvmsi < rpv.in > rpv_cvmsi.out

  • ucvm_query -f /project/maechlin_162/ucvm_bin/conf/ucvm.conf -m cvmsi < rpv.in > rpv_cvmsi.out

slurm batch script

  • %cat ucvm_query.job
  • %sbatch ucvm_query.job
  • %squeue -u maechlin
  • %cat rpv_cvmsi.out

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