Using print statements

Any print statements in the process running on the local machine will who up on the console. However prints from processes running on remote machines will not show up on your console. To be able to see the output from all processes, you have three options.

• pvm control program: Run the application from the pvm control program using the spawn command. Giving the appropriate options will redirect all output from all processes in your application to the console. See the following example, which starts a master process that further spawns 3 worker processes.

  pvm> spawn -1 -> psum 100 3
  spawn -1 -> psum 100 3
  [1]
  1 successful
  t40002
  pvm> [1:t40002] Starting 3 copies of spsum
  [1:t40003] Sending result back to master
  [1:t40004] Sending result back to master
  [1:t40002] I got 33 from 0
  [1:t40002] I got 33 from 1
  [1:t40003] EOF
  [1:t40005] Sending result back to master
  [1:t40002] I got 33 from 2
  [1:t40002] The total is 99
  [1:t40002] EOF
  [1:t40004] EOF
  [1:t40005] EOF
  [1] finished
   
  pvm>
  

• XPVM: If you are running the PVM application under XPVM, then the output from all processes can be seen by going to the menu option Views -> Task Output, which shows the output from the processes in a separate window.

• PVM daemon log: The PVM daemon maintains a log in the file /tmp/pvml.xxx, where xxx is your numerical user id (find out your user id with the command id). This log file contains the output from all the remote processes.