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Top Forums UNIX for Dummies Questions & Answers monitoring 'waiting' processes Post 302222768 by buffoonix on Thursday 7th of August 2008 01:24:30 PM
Old 08-07-2008
Quote:
3. how do I query 'zombie' processes?
Depending on the ps/OS zombies are either listed as <defunct> (on most Unices),
or simply as zombie.
You cannot query them because these are already dead (finished) processes
whose parent procs already exited without caring for their exit status.
The occurrence of zombies is most of the times an indication of badly
programmed applications.
You should at least file a bug report with their developers,
but even better not use these programs anymore.
Because zombies are already dead
they take up no resources only a slot in the process table,
which indeed can become a massive problem if a berserk application
is producing lots of them so that the total number of slots in the system's
process table gets filled up.
When this finally happens your only choice is a system reboot.
That's why zombies are sign of bad programming.
 

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PS(1)							      General Commands Manual							     PS(1)

NAME
ps, psu - process status SYNOPSIS
ps psu [ user ] DESCRIPTION
Ps prints information about processes. Psu prints only information about processes started by user (default $user). For each process reported, the user, process id, user time, system time, size, state, and command name are printed. State is one of the following: Moribund Process has exited and is about to have its resources reclaimed. Ready on the queue of processes ready to be run. Scheding about to be run. Running running. Queueing waiting on a queue for a resource. Wakeme waiting for I/O or some other kernel event to wake it up. Broken dead of unnatural causes; lingering so that it can be examined. Stopped stopped. Stopwait waiting for another process to stop. Fault servicing a page fault. Idle waiting for something to do (kernel processes only). New being created. Pageout paging out some other process. Syscall performing the named system call. no resource waiting for more of a critical resource. FILES
/proc/*/status SOURCE
/sys/src/cmd/ps.c /rc/bin/psu SEE ALSO
kill(1), db(1), ps(1), proc(3) PS(1)
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