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When a program forks and the child finishes before the parent, the kernel still keeps some of its information about the child in case the parent might need it -- for example, the parent may need to check the child's exit status. To be able to get this information, the parent calls wait(); when this happens, the kernel can discard the information.
In the interval between the child terminating and the parent calling wait(), the child is said to be a `zombie'. (If you do `ps', the child will have a `Z' in its status field to indicate this.) Even though it's not running, it's still taking up an entry in the process table. (It consumes no other resources, but some utilities may show bogus figures for e.g. CPU usage; this is because some parts of the process table entry have been overlaid by accounting info to save space.)
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regs
you can kill a zombie process by killing the parent process. this is done by issuing
kill -18 PPID or by rebooting your system
will clean up any zombie process.
What is the overhead associated with zombie process?Is it running out of process-ID?:confused:
Since some information is stored in process table..
Thanks in Advance (4 Replies)
Hey guys,
So i did some research on the site but previous posts answered most of my questions about zombie processes but I have one question that didnt seem to get addressed
"how do you find the parent or parent ID of a zombie process so you can kill it?"
I know p -kill doesnt always just... (6 Replies)
Dear Bos,
I have one server,everday if I check with command TOP always present zombie,like below:
last pid: 4578; load averages: 0.15, 0.11, 0.13 07:56:15
298 processes: 295 sleeping, 1... (10 Replies)
Is there an equivilant to the preap command in AIX that would allow me to get rid of a zombie process. I am new to AIX, moving over from Solaris and in the past I have been able to preap the pid on the defunct process to clean them up. I have looked around and the best I can see is that it may... (3 Replies)
dear friends,
in an interview they asked me what is zombie process. how we can identifying these process.if can you kill all zombie process. (8 Replies)
Hi
I need help because I don't know if it is possible to add a find inside a cat.
like I have a file with the pid of the process that use to became zombie. And I have the same pid stored in the var (pid1)
now, I have no clue how to check if the the find finds the pid or even if it's... (2 Replies)
I have RHES4 machine with VRTSralus - Backup Exec agent installed there and running as a service. The agent hiccups sometimes and turns into defunct state. The problem is that I cannot kill it anyway., it stays there forever until the machine is rebooted. I wonder if anyone had such an experience... (1 Reply)
hi!
i am writing a c program which has the following structure:
main()
{
child1
child1.1
child2
child2.1
}
the child1.1 and 2.1 are becoming zombies...
how can i handle this...
thanx (1 Reply)
04-26-2002
Zombie process
Zombie Process