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सत्येंद्र नाथ बसु राष्ट्रीय मौलिक विज्ञान केंद्र

सत्येंद्र नाथ बसु राष्ट्रीय मौलिक विज्ञान केंद्र

S. N. Bose National Centre for Basic Sciences

Publications Research publications Publication status Research publication status Annual reports Bose Archive Prof. S. N. Bose Archive
Research publications Research publication status Annual reports Newsletter Prof. S. N. Bose Archive

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Facilities
Computer Services Cell

Photon

1. Overview

Photon is a Computation Cluster for Serial Computing. User can submit serial jobs in this cluster. There are 7 compute nodes having 12 CPU cores and 24 GB of RAM each.

2. Configurations

2.1 Hardware:
  • CPU = 2 x Intel ® Xeon ® E5650 @ 2.67 GHz - 6 Core CPU
  • Cores per Node=12
  • Number of Nodes=7
  • RAM=24GB
2.2 Software:

Intel ® Fortran Compiler (V11.0) is available on this cluster.

3. How to get an account?

Students may contact their respective Faculty Supervisor for access. Accounts are available only to members of Faculty which may be used by students.

4. Usage Guidelines

4.1 Queues

When a job is submitted, it is placed in a queue. There are different queues available in the cluster which are of different walltime. The user must select any one of the queues from the ones listed below, which is appropriate for his/her computation need. All the queues mentioned here are serial queues using which users can submit serial jobs.The queue names (given in bold) are used while submitting jobs in job submission command.

There are 4 different serial queues available in the PHOTON cluster. They are as follows:

  • sl_1d_cent:This queue can be used for submitting serial jobs that require walltime upto 24Hrs/1day
  • sl_3d_cent:This queue can be used for submitting serial jobs that require walltime upto 72Hrs/3days
  • sl_10d_cent:This queue can be used for submitting serial jobs that require walltime upto 240Hrs/10days.
  • sl_1m_cent:This queue can be used for submitting serial jobs that require walltime upto 720Hrs/30days.
For submitting a job
$ qsub -N [give_a_name_of_the_job] -q <queue name> submit_script.sh

Note: On successful submission of any job, a job id is given by the scheduler. Always keep a note of this job id. You will need this for monitoring, canceling and troubleshooting purpose.

Sample submit script
#!/bin/bash
# PBS -N name_of_the_job
# PBS -o out.log
# PBS -e err.log
# PBS -l nodes=1:ppn=1


## Provide path to scratch directory
## Should be unique for each job
SCRATCH_JOB=/scratch/$USER/jobdir


## Provide path to JOB directory
## Should be unique for each job
pwd=/home/$USER/job-dir


echo "Job started at " `date`
mast=`hostname`
echo $mast
cat $PBS_NODEFILE|uniq|grep local
for i in `cat $PBS_NODEFILE|uniq|grep local`
do
      ssh $i rm -rf $SCRATCH_JOB
      ssh $i mkdir -p $SCRATCH_JOB
      ssh $i cp -r $pwd/* $SCRATCH_JOB
      chmod 700 $SCRATCH_JOB
done
cd $SCRATCH_JOB
rm -f temp.1 temp.2
NP=`cat $PBS_NODEFILE|uniq|grep local|wc -l`
echo "$NP"


## Type the command to run your executable here
./executable


cp -Rf * $pwd
for i in `cat $PBS_NODEFILE|uniq|grep local`
do
      ssh $i rm -rf $SCRATCH_JOB
done
echo "Job completed at " `date`
4.2 Useful Commands
  • Queue Status: If user want to see the queue status, the command for that is $ mshowq (it will show all the running job)
  • For checking the job status:# checkjob [job id]
  • For canceling the job:# canceljob [job id]