How to compile and run a C/MPI program "tst.c" on the cluster p1 in interactive mode?

• First, an interactive session has to be started with
  > pbs_sub -l walltime=4000,nodes=4 -I --
  remark:
  • the default maximal time for the interactive job is 3600 minutes
  • each node has two CPUs so that four nodes give access to eight CPUs
• then you should decide for your favorite MPI implementation. Available are:
  

the MPICH implementation with ch_gm device.

• To compile the program use
  > /usr/local/clos/mpich/bin/mpicc tst.c -o tst -lm
  
remark:
• the option -o tst specifies the filename "tst" of the executable (default is "a.out")
• -lm is necessary if you use the math library
• next call
  > pbs_nodes --gm
  remark:
  • this command produces a file which contains information about the nodes that are allocated for your interactive session. The filename is built using the ID of your interactive session (e.g. 54586.master1.ch_gm.tmp)
• to submit the program on 5 processors, use
  > /usr/local/clos/mpich/bin/mpirun.ch_gm --gm-f 54586.master1.ch_gm.tmp -np 5 tst myarg
  remark:
  • myarg is passed to the program as command line option
  • the option --gm-f requires the filename produced with pbs_nodes

the MPICH implementation with ch_p4 device.

• To compile the program use
  > /usr/lib/mpich/bin/mpicc tst.c -o tst -lm
  
remark:
• the option -o tst specifies the filename "tst" of the executable (default is "a.out")
• -lm is necessary if you use the math library
• next call
  > pbs_nodes --p4
  remark:
  • this command produces a file which contains information about the nodes that are allocated for your interactive session. The filename is built using the ID of your interactive session (e.g. 54586.master1.ch_p4.tmp)
• to submit the program on 5 processors, use
  > /usr/lib/mpich/bin/mpirun -machinefile 54586.master1.ch_p4.tmp -np 5 tst myarg
  remark:
  • myarg is passed to the program as command line option
  • the option -machinefile requires the filename produced with pbs_nodes

Please allocate as few as possible nodes and terminate your interactive session as quickly as possible (using the command exit).

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