Differences

This shows you the differences between two versions of the page.

--- workshops:hpcprac2 [2017/07/04 09:18]
kevin created
+++ workshops:hpcprac2 [2021/12/09 16:42] (current)
@@ Line 1: / Line 1: @@
-=====Practical 2: Using CHPC=====
+=====Practical 2: OpenMP & Using CHPC=====
 **Aim:** to launch a parallel job on the CHPC cluster //Lengau//.
@@ Line 28: / Line 28: @@
   qsub -I -P Wchpc -q R522145 -W group_list=training
+**Note:**
+  * ''-I'' selects an //interactive// job
+  * you must specify the project ''Wchpc''
+  * the queue is ''R522145''
+  * you need to specify the ''training'' group.
+**Advanced options:**
+  * ''-l select=1:ncpus=24:mpiprocs=24:nodetype=haswell_reg''
+  * interactive jobs only get one node: ''select=1''
+  * you can request all the cores on the node: ''ncpus=24''
+  * you can run MPI code: indicate how many ranks you want with ''mpiprocs=''
+If you find your interactive session timing out too soon then add ''-l walltime=4:0:0'' to the above command line to request the maximum 4 hours.
+=====OpenMP Part I=====
+To carry out the exercises in the first OpenMP practical you must run the examples on a compute node and **not** the login node.
+After logging on to lengau, the first thing you will do is request an interactive session on a compute node:
+  qsub -I -P Wchpc
+Your prompt will change to something like:
+  [student00@cnode0004 ~]$
+Remember, this is a login shell so you can change the environment as before, for example, change the prompt with
+  export PS1='\h:\w\$ '
+and now see
+  cnode0004:~$
+====Practical 2 Worksheet====
+Download and follow the {{:workshops:tut.pdf|worksheet}}.
+Copy the //OpenMP_Tut.tar.gz// file from the student00 home directory to your home directory.
+  cp ~/../student00/OpenMP_Tut.tar.gz ~/lustre
+  cd ~/lustre
+Then untar (unpack) it.
+  tar -zxvf OpenMP_Tut.tar.gz
+And then go into the //OpenMP/// tut directory and start the practical.  Have fun!
+=====OpenMP Part II=====
+====Job Script====
+Most of the prac can be done in an interactive session.

wiki.chpc.ac.za

User Tools

Site Tools

Differences

Page Tools