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IDS Forum

Re: b-tree scanner tuning and expected behavior

Posted By: GERARDO PADIERNA
Date: Monday, 21 July 2008, at 4:55 a.m.

In Response To: Re: b-tree scanner tuning and expected behavior (Obnoxio The Clown)

On the instance that now has a 'normal' CPU usage, I stopped the single one that was running and started 8 threads with:
onmode -C start 8
onmode -C threshold 2000
That's it; now, the filtered output from onstat -g ath is:
juanclu1-[PROD]-(db1):~ $ onstat -g ath | grep btscann
72316 15c33b6c8 15b9ea980 2 cond wait btc sort 1cpu btscanner_0
72317 1712a6760 156499520 2 cond wait btc sort 1cpu btscanner_1
72318 170065028 15b9c5618 1 cond wait btc sort 1cpu btscanner_2
72319 16e79d468 15ed29068 1 cond wait btc sort 1cpu btscanner_3
72320 169394028 15b9b2850 2 sleeping secs: 7 4cpu btscanner_4
72321 15a8dd140 15649ad98 2 cond wait btc sort 3cpu btscanner_5
72322 1684371d0 15ed1b430 1 cond wait btc sort 1cpu btscanner_6
72323 15a883488 15ed172f0 1 cond wait btc sort 1cpu btscanner_7
On a different instance that didn't normalize after more than 5 days, I had 8 threads, too, started with:
onmode -C start 8 (after stopping the single one that was running, with onmode -C stop)
onmode -C threshold 2000
Today I added 2 more threads with onmode -C start 2, and now, shown in onstat -g ath:
onstat -g ath | grep btscann
11095 127a0aac8 12637e1b8 2 running 3cpu btscanner_0
11096 127659300 12637f208 2 cond wait btc sort 1cpu btscanner_1
11097 127659520 126383b70 2 sleeping secs: 114 10cpu btscanner_2
11098 127659740 12637e9e0 1 cond wait btc sort 1cpu btscanner_3
11099 127659960 126384bc0 1 cond wait btc sort 1cpu btscanner_4
11100 127659b80 126384398 1 cond wait btc sort 1cpu btscanner_5
11101 127659df0 126387488 1 cond wait btc sort 1cpu btscanner_6
11102 127936b78 126386438 1 cond wait btc sort 1cpu btscanner_7
11646 1280d14a8 126381ad0 1 cond wait btc sort 1cpu btscanner_8
11647 1288bd218 126388d00 1 cond wait btc sort 1cpu btscanner_9
and, active threads:
SISAL @ fenix @ /home/informix $ onstat -g act
IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 61 days 02:13:30 -- 852992 Kbytes
Running threads:
tid tcb rstcb prty status vp-class name
8 126d73b70 0 2 running 8tli tlitcppoll
9 126e12028 0 2 running 9tli tlitcppoll
11095 127a0aac8 12637e1b8 2 running 3cpu btscanner_0
11664 12766f028 126380a80 2 running 1cpu sqlexec
As I mentioned before, the onconfig files include no BTSCANNER entry.
Thanks.

Messages In This Thread

b-tree scanner tuning and expected behavior
GERARDO PADIERNA -- Monday, 21 July 2008, at 4:11 a.m.
- Re: b-tree scanner tuning and expected behavior
  Obnoxio The Clown -- Monday, 21 July 2008, at 4:21 a.m.
  - Re: b-tree scanner tuning and expected behavior
    GERARDO PADIERNA -- Monday, 21 July 2008, at 4:55 a.m.
    - Re: b-tree scanner tuning and expected behavior
      Obnoxio The Clown -- Monday, 21 July 2008, at 5:15 a.m.
      - Re: b-tree scanner tuning and expected behavior
        John Miller iii -- Monday, 21 July 2008, at 11:23 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Fernando Nunes -- Monday, 21 July 2008, at 12:03 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        tilleul17@web.de -- Monday, 21 July 2008, at 3:30 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        Eric Rowell -- Monday, 21 July 2008, at 3:32 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        tilleul17@web.de -- Thursday, 24 July 2008, at 4:24 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        GERARDO PADIERNA -- Tuesday, 22 July 2008, at 5:13 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Obnoxio The Clown -- Tuesday, 22 July 2008, at 6:00 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        GERARDO PADIERNA -- Tuesday, 22 July 2008, at 6:32 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Obnoxio The Clown -- Tuesday, 22 July 2008, at 7:06 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        John Miller iii -- Tuesday, 22 July 2008, at 12:11 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        Obnoxio The Clown -- Tuesday, 22 July 2008, at 12:21 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        GERARDO PADIERNA -- Tuesday, 29 July 2008, at 4:49 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        John Miller iii -- Wednesday, 30 July 2008, at 2:18 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Peter_Logan@spartanstores.com -- Tuesday, 22 July 2008, at 8:15 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Peter_Logan@spartanstores.com -- Friday, 25 July 2008, at 9:17 a.m.

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