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Avoiding buffer manager thrashing
0 0 0 3312376 31840 0
0 0 0 3312376 31484 2
0 0 0 3312368 31116 0
procs
memory
r b w swap
free
0 0 0 217348
272784
0 0 0 3487124 205572
0 0 0 3487124 205572
0 0 0 3483912 204500
0 0 0 3482740 203372
0 0 0 3482676 203300
0 0 0 3343272 199964
0 0 0 3343264 185096
0 0 0 3342988 183972
0 0 0 3342860 183632
0 0 0 3342748 182316
0 0 0 3342312 181104
0 0 0 3340748 179180
0 0 0 3328704 167224
procs
memory
r
b w swap
free
7 0 0 3247636 58920
18 0 0 3246568 43732
12 0 0 3246604 37004
15 0 0 3246628 32156
478
8
0
0
0
0
0
3
0
0
0
0
0
8
0
0
0
0
0
The above output shows a steady Adaptive Server IQ querying state where the
physical memory of the machine has not been overallocated. Little to no
system page faulting is occurring. These next set of examples show
output that indicates a problem. (The output shown omits some of the above
fields to fit better on the page.)
page
re
mf
pi po fr de sr
0
148
11
3
9
0
5
0
0
0
0
5
0
0
0
0
425
36
0
0
0
17
6
0
0
0
4
10
0
0
1 2123
36
0
0
0
194
84
0
0
0
17
58
0
0
0
119 314
0
0
2
109 184
0
0
2
147
96
0
0
0
899
26
0
0
0 2993
6
0
0
The first line of the above output provides a summary of the system activity
since the machine was started. The first three lines show that there is
approximately 200MB of free physical memory and that the machine is idle.
The fourth line corresponds to Adaptive Server IQ starting up for the first time.
Beginning at the eighth line, the amount of free memory starts to reduce
rapidly. This corresponds to the Adaptive Server IQ buffer caches being
allocated and database pages being read in from disk (note that CPU usage has
increased). At this time there is little user CPU time as no queries have begun.
page
re mf
pi
po fr de sr in
0 1880 1664 0
0
0
709 1696 0
0
0
358
656 0
0
0
356 1606 0
0
0
0
0 297
201 472 82
0
0
0 260
169 597 80
0
0
0 205 1202 396 67
faults
in
sy
cs us sy
0
2 251 1835
601
0
0
86
131
133
0
0
71
162
121
0
0 169
642
355
0
0 158
370
210
0
0 160 1344
225
0
0 213
131
399
0
0 283
796
732
0
0 276 1051
746
0
0 203 1660
529
0
0 187
620
488
0
0 115
256
260
0
0 163
836
531
0
0
82 2195
222
faults
sy
cs
0
0
1131
442 1668 80 18
0
0
1084
223 1308 90 10
0
0
600
236
722 95
0
0
1141
226 1317 91
4 14
3 17
4 29
vmstat
cpu
id
6
3
91
0
1
99
0
0 100
2
2
96
1
3
97
1
2
97
7
8
85
1
6
93
2
4
94
3
4
94
4
2
95
9
2
89
4
4
92
4
7
89
cpu
us sy id
3
1
5
0
9
0
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