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IDS Forum

RE: lots of Virtual portion memory with less u....

Posted By: ART KAGEL, BLOOMBERG/ 731 LEXIN
Date: Tuesday, 5 September 2006, at 9:52 a.m.

In Response To: RE: lots of Virtual portion memory with less u.... (Dieltjens, Nadine)

Look at the online message log (onstat -m & more/less the MSG file), I would
venture to guess that IDS allocated all or at least most of those additional
segments at the same time, one right after the other. This would be because
SHMADD is too small for a single segment to satisfy the required memory needs.
Once the needed space is freed it will show up as unused in the onstat -g seg
output. If you ran the onstat -g seg at the time the segments were allocated
you would have seen almost no unused space.

Art S. Kagel
----- Original Message -----
From: Nadine Dieltjens <ids@iiug.org>
At: 9/05 9:54:25

Jacques,

It still is a open question for me , why he is using as lots of virtual
portions.
That informix takes a new when the existing ones don't have enough space
left is ok.
But why , is he taking new ones while in the existing ones has still
lots of space free ?

Thanks a lot already for your reaction.

-----Original Message-----
From: Lapeire, Jacques [mailto:jacques.lapeire@siemens.com]
Sent: dinsdag 5 september 2006 15:31
To: Dieltjens, Nadine
Subject: RE: lots of Virtual portion memory with less u.... [7431]

Art already explained how the segments appear.

Maybe you can consider the use of "onmode -F" to cleanup The space and
keep as few segments as possible.

Jacques

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
NADINE DIELTJENS
Sent: dinsdag 5 september 2006 15:02
To: ids@iiug.org
Subject: lots of Virtual portion memory with less used spac [7427]

An onstat -g seg gives following output. What is configured wrong or
whats going wrong on the system. Why is informix using few space in each
memory segment ?

Informix Dynamic Server 2000 Version 9.21.UC3 -- On-Line -- Up 69 days
17:58:55 -- 1867776 Kbytes

Segment Summary:
id key addr size ovhd class blkused blkfree
102 1381386241 a000000 1168113664 250928 R 284996 188
107 1381386246 4fa00000 356515840 11480 V 37374 49666
2024 1381386248 64e00000 1048576 632 M 133 123
201 1381386249 64f00000 33554432 1624 V 7 8185
225 1381386250 66f00000 33554432 1624 V 20 8172
126 1381386251 68f00000 33554432 1624 V 9 8183
127 1381386252 6af00000 33554432 1624 V 6 8186
128 1381386253 6cf00000 33554432 1624 V 9 8183
129 1381386254 6ef00000 33554432 1624 V 5 8187 2630 1381386255 70f00000
45088768 1976 V 1 11007
731 1381386256 73a00000 45088768 1976 V 1 11007
432 1381386257 76500000 48234496 2072 V 1 11775
433 1381386258 79300000 48234496 2072 V 1 11775
Total: - - 1913651200 - - 322563 144637

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