IDS Forum

Re: Increased Swap usage by IDS

Posted By: Paul Watson
Date: Tuesday, 30 October 2012, at 10:45 a.m.

In Response To: Re: Increased Swap usage by IDS (ANDREW FORD)

It is highly unlikely you are swapping - probably just pre-allocation

What does vmstat show in the de and sr columns ?

Cheers
Paul

Paul Watson
Oninit www.oninit.com
+1 913 387 7529

On Oct 30, 2012, at 9:42, "ANDREW FORD" <aford@networkip.net> wrote:

> Don't use top to see memory utilization by Informix, look at onstat - or t=
he=20
> Total line of onstat -g seg. Your Informix engine has only allocated about=
569=20
> MB.=20
>=20
> Each of those oninit processes in top are attaching to the same shared mem=
ory=20
> segments and that is why top gives the impression that Informix has alloca=
ted=20
> more than you think it should.=20
>=20
> It looks like you are forcing the Resident segment in memory (R* in the on=
stat=20
> -g seg output) you can also lock the Virtual segments in memory by changin=
g=20
> the RESIDENT ONCONFIG parameter if you think swapping out of Informix shar=
ed=20
> memory is causing you problems.=20
>=20
> As for why you are seeing swapping, it doesn't look like Informix has=20
> allocated any additional segments since start up so either you don't have=20=

> enough memory to allow Informix to have 569 MB and play nice with the othe=
r=20
> apps on your box or other applications are eating more memory than they sh=
ould=20
> and that is causing the swapping.=20
>=20
> Try looking at top and sort by memory utilization (option M) to find what=20=

> other apps are using.=20
>=20
> Here is what my onstat -, onstat -g seg and top sorted by memory look like=
for=20
> an engine with about 3.6 GB allocated:=20
>=20
> IBM Informix Dynamic Server Version 11.70.FC4GE -- On-Line (Prim) -- Up 6 d=
ays=20
> 07:21:40 -- 3641436 Kbytes=20
>=20
> Segment Summary:=20
> id key addr size ovhd class blkused blkfree=20
> 9371648 52564801 44000000 2655014912 31547024 R* 648195 2=20
> 9437186 52564803 e2405000 1073741824 12584664 V* 37091 225053=20
> 9469955 52564804 122405000 73728 1992 M 17 1=20
> Total: - - 3728830464 - - 685303 225056=20
>=20
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND=20
> 18883 informix 6 -10 3675m 2.7g 2.7g S 13.6 69.9 798:13.69 oninit=20
> 18916 informix 5 -10 3675m 2.7g 2.7g S 16.6 68.9 1269:14 oninit=20
> 18920 informix 5 -10 3676m 2.7g 2.6g S 14.3 68.7 677:50.63 oninit=20
> 18921 informix 5 -10 3675m 2.6g 2.6g S 10.3 68.5 369:03.99 oninit=20
> 18904 root 0 -19 3675m 48m 45m S 0.0 1.2 1:08.44 oninit=20
> 19261 nscd 15 0 450m 35m 924 S 0.0 0.9 1259:08 nscd=20
> 18923 root 5 -10 3673m 18m 16m S 3.7 0.5 124:35.24 oninit=20
> 18908 root 5 -10 3673m 10m 8396 S 0.0 0.3 0:00.77 oninit=20
> 18922 root 0 -19 3675m 10m 8048 S 0.0 0.3 0:00.40 oninit=20
> 994 arbitrat 15 0 679m 10m 3768 S 1.7 0.3 1:59.65 kpython=20
> 998 arbitrat 15 0 679m 10m 3760 S 1.0 0.3 0:48.24 kpython=20
> 996 arbitrat 15 0 679m 9.9m 3760 S 1.0 0.3 0:37.63 kpython=20
>=20
>=20
> **************************************************************************=
*****=20
> Forum Note: Use "Reply" to post a response in the discussion forum.=20

Messages In This Thread

• Increased Swap usage by IDS
  GURPREET SACHDEVA -- Tuesday, 30 October 2012, at 9:41 a.m.
  • Re: Increased Swap usage by IDS
    ANDREW FORD -- Tuesday, 30 October 2012, at 10:42 a.m.
    • Re: Increased Swap usage by IDS
      Paul Watson -- Tuesday, 30 October 2012, at 10:45 a.m.
  • Re: Increased Swap usage by IDS
    Art Kagel -- Tuesday, 30 October 2012, at 3:50 p.m.

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