We have a 4100 with 512Mb running Digital's CICS as the front end of our
application. Every once and a while the system starts to report what I
find to be incredibly high page faults. Here is an excerpt from my
always running vmstat at 15 minute intervals:
procs memory pages intr cpu
r w u act free wire fault cow zero react pin pout in sy
cs us sy id
2632 28 33K 13K 15K 125K 26K 39K 2 40K 0 354 826 1K 4
5 91
3766 28 37K 10K 15K 216K 59K 43K 807 106K 0 330 1K 1K 10
6 83
3956 28 39K 7680 15K 202K 59K 41K 757 106K 0 407 1K 1K 10
7 83
41284 28 43K 2918 16K 47M 70K 42K 5 124K 0 434 1K 1K 14
30 57
31102 28 39K 7076 16K 147M 94K 49K 8331 177K 2701 469 1K 1K 21
79 0
3708 28 37K 12K 12K 171M 46K 44K 460 79K 0 444 1K 1K 11
89 0
3925 28 37K 9190 16K 168M 49K 42K 1355 86K 0 461 1K 1K 11
89 0
3700 28 35K 12K 14K 168M 44K 42K 905 75K 0 462 1K 1K 11
89 0
Notice the numbers in the fault column, 47M, 147M, 171M, 168M...
At 15 minute intervals this works out to about 100,000 faults sec! And
sure enough I can measure that real time also. Ive seen upwards of
500,000 faults second. Oddly enough when this is happening, there is no
other noticeable impact on performance, cpu or disk.
Can anyone shed any light on what is going on here?
Thanks
John Hergert
Received on Thu Aug 06 1998 - 18:19:23 NZST