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IDS Forum

identify what is allocating memory

Posted By: Cesar Martins
Date: Friday, 28 July 2017, at 10:02 a.m.

Hi ,

How identify what/who is consuming memory in a specific virtual memory
segment ?
With onstat -g ses , there is no session with high memory allocated.
The amount of users sessions is keeping at regular average...
No buffers pool was allocated automatically (I check with onstat -g buf)

Not sure if how I doing is correct or accurate.
I looking with 'onstat -g mem' , looking for the base of memory address and
adding the totalsize column.

Below is part of 'onstat -g seg' , with last segments . Where the engine
was allocated at last 4 hours.

I choose the "7000029f" to check with onstat -g mem , which have 512MB and
almost no free blocks.

===========
IBM Informix Dynamic Server Version 12.10.FC8W1 -- On-Line -- Up 51 days
12:42:34 -- 176212368 Kbytes
Segment Summary:
id key addr size ovhd class
blkused blkfree
. . .
1048588 52574813 700002920000000 268435456 3147384 V
65514 22
1048587 52574814 700002930000000 268435456 3147384 V
65530 6
24 52574815 700002940000000 268435456 3147384 V
65514 22
25 52574816 700002950000000 268435456 3147384 V
65522 14
26 52574817 700002960000000 268435456 3147384 V
65516 20
27 52574818 700002970000000 536870912 6293160 V
131052 20
28 52574819 700002990000000 536870912 6293160 V
131035 37
29 5257481a 7000029b0000000 536870912 6293160 V
131040 32
30 5257481b 7000029d0000000 536870912 6293160 V
131020 52
31 5257481c 7000029f0000000 536870912 6293160 V
131008 64
32 5257481d 700002a10000000 536870912 6293160 V
130951 121
33 5257481e 700002a30000000 536870912 6293160 V
89679 41393
Total: - - 180441464832 - -
43985827 67265

===============

Running my script, where it execute 'onstat -g mem' , filter using grep and
adding the 4 column of all output (Pool + Blkpool)
Doesn't reach 100MB (73MB at the total)

$ ifx.mem.sh 7000029f
Pool Summary: - - - -

- 0 MB 0 MB
name class addr totalsize freesize
#allocfrag #freefrag 0 MB 0 MB
Blkpool Summary: - - - -

- 0 MB 0 MB
name class addr size #blks -

- 0 MB 0 MB

4149288*O0 V 7000029f0bd1040 4096 768 1 1 0 MB 0 MB
4149352*O0 V 7000029fe1aa040 4096 768 1 1 0 MB 0 MB
4149370*O0 V 7000029f8ade040 4096 768 1 1 0 MB 0 MB
...
4150008 V 7000029f9bec040 2199552 60320 1765 62 43 MB 2 MB
4151843 V 7000029f2b9a040 2285568 95584 1766 50 46 MB 2 MB
4149410 V 7000029fb921040 2437120 79944 1820 82 48 MB 2 MB
4149299 V 7000029f643b040 2482176 42592 1796 61 50 MB 2 MB
4149357 V 7000029fe8fa040 3330048 82608 3000 65 53 MB 3 MB
4149544 V 7000029f54b0040 4034560 25760 3975 29 57 MB 4 MB
4149799 V 7000029f06b5040 6234112 17256 7376 23 63 MB 6 MB
4149484 V 7000029fcb7b040 10416128 155432 9314 119 73 MB 10 MB

is correct sum this way ? they don't should match with 'onstat -g seg' ?
filtering the base of memory address to match with the segments at 'onstat
-g seg' ?

the onstat -g mem doesn't show all entries which use the virtual memory ?

(I've notice this version doesn't show the Buffer pool any more, but as I
said before, there is no change at buffers)

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