Parallel Processing Detection and Program Return Value Detection Post: 302535729

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Top Forums Programming Parallel Processing Detection and Program Return Value Detection Post 302535729 by Corona688 on Friday 1st of July 2011 01:13:50 PM

07-01-2011

Registered User

Quote:

Originally Posted by azar.zorn

is it possible to tell what created the thread or child process?

Try ps -ejT, that should print a process tree. The information ps uses to create this may be available under /proc/. For more detail than that I'd need to know what your system is.

Quote:

or follow the child/thread to find the program it is linked to?

You can do that too! If you're on Linux, strace prints all system calls the program makes as it happens, including the various clone_* ones that Linux uses to create threads or processes. (you'd want to run it with -f so it follows any children it creates in the meantime too.) I think Solaris has dtrace. Other systems I'm not sure.

How to get information on threads would be a lot more system-specific than information on processes.

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ptree

ptree(1)						      General Commands Manual							  ptree(1)

NAME

       ptree - prints the process tree hierarchy

SYNOPSIS

       [pid1|username1 [pid2|username2]...]

DESCRIPTION

       prints  the process tree of all processes that match the specified arguments.  While printing the tree, the child processes are indented to
       the right from their respective parent processes.

   Options
       Prints the tree starting from the children of
		 (usually pid 0).  The default is to print the tree starting from the children of (pid 1).

   Operands
       pid	 Print the process tree for the process ID number specified by pid.

       username  Print the process tree for all the processes from the user specified by username.  Note that only username (and not user ID)  can
		 be specified for this instance.

       If no operands are specified, then prints the process tree of all processes starting from the children of or (if is specified).

EXTERNAL INFLUENCES

   Environment Variables
       If is not specified or is null, it defaults to (see lang(5)).

EXAMPLES

       Print the process tree for pid 100 and for all processes owned by

WARNINGS

       Process information can change while is running; the tree displayed by is only a snapshot in time.  Some data printed for defunct processes
       is irrelevant.

       Users of must not rely on the exact field widths and spacing of its output, as these will vary depending on the system and the  release	of
       HP-UX.

SEE ALSO

       pgrep(1), pkill(1), ps(1), fork(2).

																	  ptree(1)