Shortlived Process Don't Appear in 'top' or 'ps' Post: 302246835

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Operating Systems HP-UX Shortlived Process Don't Appear in 'top' or 'ps' Post 302246835 by Perderabo on Tuesday 14th of October 2008 01:33:55 PM

10-14-2008

Administrator Emeritus

To answer your questions, yes it is possible for short-lived processes to never show up. In fact it is very unlikely that a short lived process will show up in ps or top. Those programs read the process table with techniques that are almost as fast as a memory to memory data move. Once they have this snapshot, they prepare a report. top repeats this every n seconds, but top presents you with a program...it does not want to show all processes, just the "top" ones. You have a better shot with ps. A short-lived process can be gone in well under a tenth of a second.... let's say that yours is lasting exactly one tenth of a second... That means that ps must capture a process table snapshot sometime during that tenth of a second. This is very hard to arrange in a reliable fashion. A very clever wrapper program that runs both ps and your program nearly simultaneously might be able to do it.

But if the program shows up in glance but not ps/top, I tend to suspect something else. It could be that the program is destroying it's command line. You might try: ps -el and see if it shows up.

Perderabo

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LEARN ABOUT OSF1

dxproctuner

dxproctuner(8)						      System Manager's Manual						    dxproctuner(8)

NAME

       dxproctuner - Manages and monitors system processes

SYNOPSIS

       /usr/bin/X11/dxproctuner

OPTIONS

       Process	Tuner  accepts all of the standard X Toolkit command line options, which are documented in the OPTIONS section in the X(1X) refer-
       ence page.

DESCRIPTION

       The Process Tuner application, dxproctuner, is used to monitor and manage processes.

       Use Process Tuner to: Display a list of processes and their characteristics Display the processes running for yourself or all users Display
       and modify process priorities Send a signal to a process

       The Process Tuner application can be invoked from the CDE Application Manager from the following categories:

       Application Group:	System_Admin
       System Admin Subgroup:	MonitoringTuning

EXAMPLES

       To  start  Process  Tuner  from	the command line, enter: dxproctuner You can view the Process Tuner online help volume without running the
       application. To open the Process Tuner help volume from the  command  line,  enter  the	following  command:  /usr/dt/bin/dthelpview  -h  
       /usr/dt/appconfig/help/C/Dxproctuner.sdl

FILES

       Contains  user  preferences  that  control the appearance of the application Contains the Process Tuner application executable Contains the
       Process Tuner help volume Contains the default values for the application's X resources

SEE ALSO

       Commands: kill(1), ps(1), X(1X)

       System Calls: exit(2), kill(2), sigaction(2)

       Files: signal(4)

																    dxproctuner(8)