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IDS Forum

Re: Threat : swth:sbt_subclass_lpgsrc_ol_796

Posted By: Alberto Romeu Pessonio Filho
Date: Wednesday, 1 November 2017, at 9:07 a.m.

In Response To: Threat : swth:sbt_subclass_lpgsrc_ol_796 (LEY PATRICK)

Hi Ley!

Probably you're facing a kind of memeory bottleneck.

I had a similar issue related to memory contention on my environment (that
was shown through onstat -g wmx) and it lead to a defect. Also, I had many
other memory contention issues during my IBM journey on huge customer.

The following steps were used to track this issue:

1- When you have a "memory" thread showed on "onstat -g act/ onstat -g rea"
outputs, check the mutexes info from "onstat -g lmx/onstat -g wmx"

Im my case(RR_ID hash), the contention happened on routine resolution cache:

[informix@valencia01 ~]$ onstat -g wmx IBM Informix Dynamic Server Version
12.10.FC5X2 -- On-Line (Prim) -- Up 21 days 04:48:56 -- 25811176 Kbytes
Mutexes with waiters: mid addr name holder lkcnt waiter waittime 9950
6207faa8 RR_ID hash 396 117437832 0 117437835 0 117437850 0 117432874 0
117437843 0 117386806 0 117417336 0 117437838 0 117437847 0 117437837 0
117437844 0 117437851 0 117437829 0 117437836 0 117386802 0 117432841 0
117432878 0 117432861 0 Number of mutexes on VP 1 free list: 127929 Number
of mutexes on VP 2 free list: 0 Number of mutexes on VP 3 free list: 0
Number of mutexes on VP 4 free list: 0 Number of mutexes on VP 5 free list:
0 Number of mutexes on VP 6 free list: 0 Number of mutexes on VP 7 free
list: 0 Number of mutexes on VP 8 free list: 0 Number of mutexes on VP 9
free list: 127986 Number of mutexes on VP 10 free list: 127990 Number of
mutexes on VP 11 free list: 127994 Number of mutexes on VP 12 free list:
127836 Number of mutexes on VP 13 free list: 127993 Number of mutexes on VP
14 free list: 127997 Number of mutexes on VP 15 free list: 127999 Number of
mutexes on VP 16 free list: 127997 Number of mutexes on VP 17 free list:
127966 Number of mutexes on VP 18 free list: 127979 Number of mutexes on VP
19 free list: 127978 Number of mutexes on VP 20 free list: 127997 Number of
mutexes on VP 21 free list: 128000 Number of mutexes on VP 22 free list:
127982 Number of mutexes on VP 23 free list: 0 Number of mutexes on VP 24
free list: 0 Number of mutexes on VP 25 free list: 0 Number of mutexes on
VP 26 free list: 0 Number of mutexes on VP 27 free list: 0 Number of
mutexes on VP 28 free list: 0 Number of mutexes on VP 29 free list: 0
Number of mutexes on VP 30 free list: 0 Number of mutexes on VP 31 free
list: 0 Number of mutexes on VP 32 free list: 0

In this case, we can see a "mutex id" thread locking a memory resource, and
several threads are waiting to acquire that resource.

I can't be sure if it is related to large pages... Did you export
IFX_LARGE_PAGES when you started IDS after enable it at OS level?

1 - In order to get more information from the issue you're facing, look at
those outputs, and share what you think that is strange. I can support you
properly if you share it, as well.

- onconfig,
- onstat -g env
- onstat -g spi|head -n 6;onstat -g spi| sort -r -n -k 1|head -n 50
*- onstat -g con |head -n 50*
*- onstat -g lmx *
*- onstat -g wmx*
- onstat -g vpcache
- onstat -g glo
- onstat -g sch
- onstat -g scn
- some samples of vmstat or lparstat
- some samples of onstat -g stk from those thread ID (
swth:sbt_subclass_lpgsrc_ol_*)

Those output highlighted above gonna show useful info.

2 - Have you increased hardware threads/virtual cores/Entlited Capacity on
your AIX, when you enabled large pages? What is the AIX version?

3 - Some useful info to collect from AIX OS:
http://www.unixmantra.com/2013/09/aix-listing-cpu-memory-ram-harddisks-ip-address.html

Regards,
Alberto.

2017-10-31 22:19 GMT-02:00 LEY PATRICK <patrickley@gmail.com>:

> Platform : AIX 7
> Informix version: 11.70.FC7W3XC
> Config : 1 primary, 1 secondary and 4 RSS
>
> Note : We do turn on the large page on AIX level
>
> I run onstat -g rea -r 1 and occasionally see the threat name
> swth:sbt_subclass_lpgsrc_ol_796
>
> Questions:
> 1) What is this thread and the purpose of this threat?
> 2) Is this threat related to Large Page ?
>
> Snip of onstat -g rea -r 1
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:00 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 170cpu* memory
>
> [informix@obnfrmxdb01p2] /home/informix #onstat -g rea -r 1
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:04 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 21cpu* memory
> 31110 70000500a4d17f0 7000047f8046428 1 ready 22cpu sqlexec
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:05 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:06 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 63 7000047ae1814c0 0 2 ready 9cpu* soctcplst
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 239cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:07 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 20cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:08 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 172cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:09 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:10 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 115cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:11 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 115cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:12 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 220cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:13 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:14 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 131cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:15 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 230cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:16 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2323 7000047fd7f71e8 7000047f429afe8 3 ready 9cpu smxrcv sbdardbi02_tcp
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:17 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 177cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:18 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 284cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:19 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 97163 700004d3352c630 70000506246a4a8 1 ready 16cpu sqlexec
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:20 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 143cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:21 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 182cpu* memory
> 2357 7000047fd2c1c58 7000047f42944a8 3 ready 21cpu RSS_Send_sbdardbi01_tcp
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:22 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 173cpu* memory
> 4114 700004883b57028 70000487dfd6c28 1 ready 36cpu sqlexec
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:23 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 8cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:24 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 21cpu* memory
> 48019 7000055d7505220 7000050624683a8 3 ready 21cpu readahead_6
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:25 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 186cpu* memory
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:26 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 3955 700004874c08a48 7000048699f66a8 1 ready 16cpu sqlexec
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:27 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 1cpu* memory
> 2327 7000048048b45e0 7000047f429d0e8 3 ready 1cpu RSS_Send_sbdardbi02_tcp
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:28 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 79599 700005ca76912b0 70000488420e368 2 ready 179cpu* sqlexec
> 81457 700005c4d1e4370 700005931acd3a8 1 ready 30cpu
> swth:sbt_subclass_lpgsrc_ol_796
> 81489 70000582c5c9d20 7000056dd5f3428 1 ready 28cpu
> swth:sbt_subclass_lpgsrc_ol_796
> 81576 700005cac602028 700005cf5871768 1 ready 28cpu
> swth:sbt_subclass_lpgsrc_ol_797
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:29 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 193cpu* memory
> 81489 70000582c5c9d20 7000056dd5f3428 1 ready 28cpu
> swth:sbt_subclass_lpgsrc_ol_796
> 97162 700005a43d042b0 700004956f71328 2 ready 308cpu* sqlexec
>
> IBM Informix Dynamic Server Version 11.70.FC7W3XC -- On-Line (Prim) -- Up
> 05:20:30 -- 521929792 Kbytes
>
> Ready threads:
> tid tcb rstcb prty status vp-class name
> 59 7000047ae10dbb0 0 2 ready 8cpu* soctcplst
> 2034 7000047fbeb7790 7000047a307a4e8 3 ready 9cpu* memory
>
> [informix@obnfrmxdb01p2] /home/informix #uname -a
> AIX obnfrmxdb01p2 1 7 00CCBC174C00
>
> All input are welcome.
>
>
> ************************************************************
> *******************
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