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IDS Forum

Excessive and sudden Virtual Segment allocation

Posted By: Malc_p
Date: Wednesday, 10 September 2003, at 5:21 a.m.

Our development server instance runs perfectly happily day in, day out with plenty of Virtual memory as follows (IDS7.31, HP-UX 10.20)
dev:dba:/users/dba>onstat -g seg

Informix Dynamic Server Version 7.31.UC2 -- On-Line -- Up 21 days 17:02:11 --
248456 Kbytes

Segment Summary:
id key addr size ovhd class blkused blkfree
49664 1381386241 c1d2f000 80330752 4484 R* 9799 7
(shared) 1381386241 c69cb000 153608192 2952 V 2058 16693
561672 1381386242 cfe5f000 2187264 644 M 260 7
Total: - - 236126208 - - 123117 16707

(* segment locked in memory)

Under all day-to-day processing, this has been fine for a couple of years.
Now one of our developers is testing a Java app via sockets from an NT box and all of a sudden we get loads of additional segments; the SQLs look pretty innoccuous (using onstat -g sql) - no huge GROUP BYs, ORDER BYs, multi-table joins or whatever.
a check on memory usage by sessions shows:
dev:dba:/users/dba>onstat -g ses|sort -n -r -k7|head
50021 inetuser - -1 tw00887 1 155213824 153336880
50117 inetuser - -1 twe_nt_w 1 909312 883328
50094 rxf ttyq0 14133 dev 1 638976 630160
50127 dcr ttype 15514 dev 1 557056 534680
50116 oxs ttyq7 15134 dev 1 524288 516096
50129 dxg ttyp5 18992 dev 1 475136 436336
50061 dag ttypf 11047 dev 1 114688 99608
50025 dag ttypf 7996 dev 1 90112 81568
50108 pjh ttyqf 14887 dev 1 81920 70696
50112 inetuser - -1 twe_nt_w 1 40960 28776
So 155Mb is used when the averag per user is normally 40 to 65 Kb.
When the user 'inetuser' drops the connection, the segments are released and I can drop them with onmode -F.
How can I check what the extra Vseg usage is caused by?
Ta
Malc

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