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Monitoring, Debugging and Performance Analysis Tools for OpenMP

Monitoring and Debugging Threads:

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% ps -Lf 
UID        PID  PPID   LWP  C NLWP STIME TTY          TIME CMD
blaise   22529 28240 22529  0    5 11:31 pts/53   00:00:00 a.out
blaise   22529 28240 22530 99    5 11:31 pts/53   00:01:24 a.out
blaise   22529 28240 22531 99    5 11:31 pts/53   00:01:24 a.out
blaise   22529 28240 22532 99    5 11:31 pts/53   00:01:24 a.out
blaise   22529 28240 22533 99    5 11:31 pts/53   00:01:24 a.out

% ps -T 
  PID  SPID TTY          TIME CMD
22529 22529 pts/53   00:00:00 a.out
22529 22530 pts/53   00:01:49 a.out
22529 22531 pts/53   00:01:49 a.out
22529 22532 pts/53   00:01:49 a.out
22529 22533 pts/53   00:01:49 a.out

% ps -Lm 
  PID   LWP TTY          TIME CMD
22529     - pts/53   00:18:56 a.out
    - 22529 -        00:00:00 -
    - 22530 -        00:04:44 -
    - 22531 -        00:04:44 -
    - 22532 -        00:04:44 -
    - 22533 -        00:04:44 -

LC’s Linux clusters also provide the top command to monitor processes on a node. If used with the -H flag, the threads contained within a process will be visible. An example of the top -H command is shown below. The parent process is PID 18010 which spawned three threads, shown as PIDs 18012, 18013 and 18014.

terminal window screenshot

Performance Analysis Tools: