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IDS Forum

CPU consumption and table size

Posted By: KAMRAN HAQ
Date: Wednesday, 14 October 2009, at 4:13 p.m.

Hi,
One IDS instance running on a production server consuming a lot of CPU resources. From following given output of mpstat, it is visible that processors 7 to 15 which are assigned to that instance get almost 100% busy in peak transaction hours, and causes the transactions timeouts and long duration checkpoints.

CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl
0 369 26 3670 1637 200 1998 99 240 139 0 2323 17 19 0 64
1 163 14 490 619 0 865 82 186 56 0 3622 49 14 0 37
2 526 12 446 867 0 1146 36 242 55 1 2792 22 13 0 66
3 284 9 183 583 0 760 26 177 42 0 2616 19 15 0 67
4 214 5 1078 537 0 782 19 147 37 0 1761 28 11 0 61
5 258 6 219 427 0 670 9 156 36 0 1448 12 8 0 80
6 36 4 581 324 0 539 7 129 30 0 1521 9 6 0 85
7 16 0 136 43 0 50 42 7 23 0 1378 97 3 0 0
8 1 0 15 18 0 24 16 0 2 0 26 100 0 0 0
9 3 0 51 15 0 20 14 0 6 0 217 99 1 0 0
10 2 0 16 17 0 19 14 0 2 0 164 98 1 0 1
11 3 0 1925 1844 1807 65 34 1 16 0 523 90 9 0 1
12 3 0 193 22 0 31 18 0 9 0 679 96 2 0 2
13 2 0 25 28 0 42 21 1 3 0 118 97 0 0 2
14 1 0 62 45 30 18 13 0 4 0 106 99 1 0 1
15 2 1 234 238 219 25 16 0 10 0 182 98 2 0 1
16 104 14 325 533 7 1079 22 177 59 0 2120 12 7 0 80
17 57 12 555 632 66 1183 15 178 56 0 1685 6 10 0 84
18 374 14 493 558 2 1197 14 173 72 0 1284 5 7 0 89
19 129 15 534 471 0 1027 12 151 63 0 949 9 6 0 85
20 89 11 410 416 0 945 15 153 54 0 1712 9 8 0 83
21 139 7 268 440 0 982 17 157 43 0 1433 9 7 0 84
22 69 25 285 482 0 1088 15 170 51 0 1149 8 6 0 87
23 182 7 1141 468 0 1161 24 141 44 0 3054 14 12 0 75

The degradation in performance heavy load on CPU is observed after great increase in size of a transactional table. This table has around 250 columns and 40-50 indexes. My question is how can we find relaton between table-size(number of rows) and CPU utilization. Thanks.
regards,
Kamran

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SunOS CA-MCPDB2 5.10 Generic_125100-09 sun4v sparc SUNW,Sun-Fire-T200
Informix version: IBM Informix Dynamic Server Version 11.50.FC3W1

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