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Re: wait for mutex

Posted By: JACQUES RENAUT
Date: Wednesday, 20 August 2014, at 11:41 a.m.

In Response To: Re: wait for mutex (FRANK)

Original post:

Thanks, Fernando!

Here it is, confused ...
We indeed have ER slow/ data queued issue now

Frank

informix@walter ~]$ onstat -g wmx
IBM Informix Dynamic Server Version 11.50.FC8 -- On-Line -- Up 00:54:05
-- 11847728 Kbytes
Mutexes with waiters:
mid addr name holder lkcnt waiter
waittime
6543 1d9fbc8f0 rqmut_trg_send 5496 0 227 0

5504 0

98 0

196 0

107 0

5488 0
7605 1dbb72ee0 CDRDSn0022 4484 0 210 17

4430 17

<stuff removed>

Number of mutexes on VP free lists: 10735
Read/Write Locks
addr id name slocks xlock waiters
[informix@walter ~]$ onstat -g lmx
IBM Informix Dynamic Server Version 11.50.FC8 -- On-Line -- Up 00:54:17
-- 11847728 Kbytes
Locked mutexes:
mid addr name holder lkcnt waiter
waittime
6307 1d9c113d0 qtrMutex31 5488 0
6543 1d9fbc8f0 rqmut_trg_send 5496 0 5495 0

5488 0
6547 1d9fbcb90 rqrest_trg_send 5496 0
7605 1dbb72ee0 CDRDSn0022 4484 0 210 29

4430 29

<stuff removed>

Response:

From the -g wmx/-g lmx along with the -u you posted makes it look like the issue is with the CDRDSn0022 mutex. It has been held by thread 4484 for 29 seconds when this onstat data was captured. So is that thread waiting on anything (I'd look at -g ath and -g stk <thread id>). I would say it's probably not expected that a mutex to be held for ~ 30 seconds

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