Progressive Lab for Linux

The goal of the previous lab was to compile a C/C++ or Fortran program, creating an executable named karp. In this section we will run that executable on a compute machine by submitting a batch script from one of the CTC linux login machines.

Prerequisites:

1. Read Velocity Scheduler.
2. You will need the following files, all located in $HOME/lab
   • the input file values, copied in the first lab section.
   • the batch scripts karp.serial.xml and karp.serial.sh, copied in the first lab section.
   • an executable named karp, either created in the previous section or copied from /ctc/vwlabs/Progressive/ .
3. If you haven't already, run the script setup_ssh_mpd_linux.sh as instructed in the first page of this lab, Logon and Copy Files.

Instructions:

1. Review the file $HOME/lab/karp.serial.xml and $HOME/lab/karp.serial.sh to be sure you understand what they do. Check the file path specified throughout the scripts. Save your changes.
2. Move to the directory $HOME/lab where the files karp.serial.xml, karp.serial.sh, karpf, karpc, and values are located.
3. Submit your job to the Velocity Scheduler with the command:
   vsched -s karp.serial.xml
4. The response should include the jobid, e.g.:

   WARNING:  Run statement cannot be verified
   39036

   The warning statement indicates that vsched did not have permissions to verify the program you specified in the run tags.
5. Check the status of your job by issuing the vsched -q command. Since you cannot specify when a batch job runs, you should periodically check the status of the job with vsched -q.
6. When your batch job has ended, check your results.The batch script creates a directory $HOME/lab/output to which it copies the output.

Results:

For the C program, the file $HOME/lab/output/karpc.stdout should look like the output shown below.

Approximation interval is 10
host calculated x = 3.14243
sum, err = 3.14243, 8.333314e-04
Approximation interval is 100
host calculated x = 3.14160
sum, err = 3.14160, 8.333333e-06
Approximation interval is 0
node 0 left

If you used the Fortran program, the file $HOME/lab/output/karpf.stdout should look like the output shown below.

 
 Number of approximation intervals =           10
 host calculated x=   3.14242601481582     
 sum, err =   3.14242601481582       8.332738032423848E-004
 Number of approximation intervals =          100
 host calculated x=   3.14160094221945     
 sum, err =   3.14160094221945       8.201206881608414E-006
 Number of approximation intervals =            0