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The Golden Rule:
Never run heavy computations on the Login Node.
The login node i.e. "hpc.manit.ac.in" is for submitting jobs only. If you run a heavy simulation there, either your job will be killed automatically or account may be banned from login to the hpc cluster.
🔍Interactive Jobs
🔍 Useful for running small experiments
Eg:
$ qsub -I -l select=1:ncpus=2:mem=4gb -l walltime=01:00:00
Once resources are allocated, you will receive:
qsub: job 123.server ready
🔍Environment Modules (If Available)
To list available software:
$ module avail
To load software:
$ module load software_name
Eg.
$ module load apps/anaconda3
To check loaded modules:
$ module list
🔍 Explanation of PBS Directives
Directive Meaning
#PBS -N Job name
#PBS -q Queue name
#PBS -l select= Resources (nodes, CPUs, memory)
#PBS -l walltime= Maximum job runtime
#PBS -o Output file
#PBS -e Error file
$PBS_O_WORKDIR Directory from where job was submitted
🔍 Understanding Job States
Code Meaning
Q Queued
R Running
C Completed
E Held
H Exiting
🔍 Sample Workflow for a New Users
Login to HPC
Create working directory
Upload code/data
Test interactively
Create PBS script
Submit job using qsub
Monitor using qstat
Download results
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