Re: intermittent very high waits in LGWR on Linux?

bugbear wrote:
--->> 14:40:47.224930 semop(720898, 0xbfffe6b0, 1) = 0

I'm only guessing but I would bet sem_op is negative in that syscall (and a portion of pseudo-code on metalink is enforcing by belief).

I'd say semop is waiting for a semaphore to be released so I'd look inside oracle more than at the OS level.

If you are unsure try simply to change the kernel with a newer 2.4 (since you are there) vanilla and see what happens.

This call is also interesting:

setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={1, 380000}}, NULL) = 0

Your semop will never wait "too long"...

Regards

-- 
Fabrizio Magni

fabrizio.magni_at_mycontinent.com

replace mycontinent with europe