topic How LINUX OS picks the PID in Operating System - Linux

How LINUX OS picks the PID

skt_skt — Thu, 04 Jun 2009 10:13:37 GMT

RHEL AS

I happened to trace a Oracleprocess which is suppose to be terminating at a particular time. I am not sure if a new process can come up with same PID of an "old process"

Re: How LINUX OS picks the PID

Steven E. Protter — Thu, 04 Jun 2009 11:04:42 GMT

Shalom,

The OS maintains a table, and hands out PID sequentially.

It is very unlikely for the new process to pick up the same PID as the old.

SEP

Re: How LINUX OS picks the PID

Ivan Ferreira — Thu, 04 Jun 2009 12:17:44 GMT

The pid assignment process wraps at 32767.

$ cat /proc/sys/kernel/pid_max
32768

Next time around, the kernel skips over any
pids that are still in use from the last round of assignment.

Re: How LINUX OS picks the PID

Dennis Handly — Sat, 06 Jun 2009 10:14:56 GMT

Your HP-UX thread on this issue:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1345148