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Operating Systems AIX Vmstat fault section all values are 0 Post 302770791 by DGPickett on Monday 18th of February 2013 11:21:26 AM
Old 02-18-2013
As I recall, vmstat needs some help to see all your disks and such. The default set may be a subset.

Zombies are more specifically caused when the parent is not honoring SIGCHLD, so the notification at the bitter end of child life cannot be passed. The rcp/rsh family was famous for this. I guess paranoid programmers block signals rather than accept one of the default handlers. Interactive shells can have a sort of zombie when background processes stop for terminal i/o or termination notification. Check out the PPID, any shared tty processes of the zombies to see if there is a pattern to them. They take up a process slot but do not have a lot of overhead, so do not get OCD about them when you have bigger fish to fry to fix your slow system. Smilie

I have seen systems crawl for desperate lack of swap space, but with all those zeros, swap seems out fo the picture. Check, though!

Is this Oracle slowness or shell ?

Last edited by DGPickett; 02-20-2013 at 01:40 PM..
 

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wait(3) 						     Library Functions Manual							   wait(3)

NAME
wait - check child process status SYNTAX
#include <wait.h> int wait_nohang(&wstat); int wait_stop(&wstat); int wait_stopnohang(&wstat); int wait_pid(&wstat,pid); int wait_exitcode(wstat); int wait_crashed(wstat); int wait_stopped(wstat); int wait_stopsig(wstat); int pid; int wstat; DESCRIPTION
wait_nohang looks for zombies (child processes that have exited). If it sees a zombie, it eliminates the zombie, puts the zombie's exit status into wstat, and returns the zombie's process ID. If there are several zombies, wait_nohang picks one. If there are children but no zombies, wait_nohang returns 0. If there are no children, wait_nohang returns -1, setting errno appropriately. wait_stopnohang is similar to wait_nohang, but it also looks for children that have stopped. wait_stop is similar to wait_stopnohang, but if there are children it will pause waiting for one of them to stop or exit. wait_pid waits for child process pid to exit. It eliminates any zombie that shows up in the meantime, discarding the exit status. wait_stop and wait_pid retry upon error_intr. STATUS PARSING
If the child stopped, wait_stopped is nonzero; wait_stopsig is the signal that caused the child to stop. If the child exited by crashing, wait_stopped is zero; wait_crashed is nonzero. If the child exited normally, wait_stopped is zero; wait_crashed is zero; and wait_exitcode is the child's exit code. SEE ALSO
wait(2), error(3) wait(3)
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