Virtual Memory
From: Mark (decent_tiger_at_yahoo.com)
Date: 11/19/03
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Date: 19 Nov 2003 11:18:48 -0800
Over the past few days I am noticing some software crashes on the UNIX
Server. The logs of the servers don't show anything because probably
the standard output is not working at the time of the crash and this
has prompted me to check the virtual memory statistics on the UNIX
Server. I am not able to comprehend and relate the output of these
commands too well.
> vmstat 1
Virtual Memory Statistics: (pagesize = 8192)
procs memory pages intr
cpu
r w u act free wire fault cow zero react pin pout in sy cs
us sy id
20 786 205 638K 149K 239K 33G 1G 3G 39113 3G 0 1K 20K 7K
9 16 75
16 791 205 639K 148K 239K 8403 1050 4868 0 888 0 1K 19K 8K
20 25 56
19 788 204 633K 153K 239K 8783 1159 5204 0 709 0 886 15K 8K
16 17 67
19 789 204 634K 152K 239K 6874 1240 4557 0 837 0 732 17K 7K
19 16 65
18 796 205 637K 149K 239K 11250 2010 5777 0 2334 0 695 19K 6K
28 23 49
Is 149K of free memory alarming ? Do you see any problem with the
virtual memory usage ? When I do vmstat-s I see the following stats -
> vmstat -s
Virtual Memory Statistics: (pagesize = 8192)
208335 active pages
73422 inactive pages
178967 free pages
245443 wired pages
33438697750 virtual memory page faults
1371069120 copy-on-write page faults
3417766451 zero fill page faults
39113 reattaches from reclaim list
3479713004 pages paged in
0 pages paged out
14637421302 task and thread context switches
2120624601 device interrupts
41916705505 system calls
And swapon -s gives the following output
gs140b:/prod/ecs/edi/geisupload/log > swapon -s
Swap partition /dev/disk/dsk57c:
Allocated space: 523755 pages (4.00GB)
In-use space: 129 pages ( 0%)
Free space: 523626 pages ( 99%)
Swap partition /dev/disk/dsk58c:
Allocated space: 523755 pages (4.00GB)
In-use space: 129 pages ( 0%)
Free space: 523626 pages ( 99%)
Swap partition /dev/disk/dsk59c:
Allocated space: 523755 pages (4.00GB)
In-use space: 129 pages ( 0%)
Free space: 523626 pages ( 99%)
Total swap allocation:
Allocated space: 1571265 pages (11.99GB)
In-use space: 387 pages ( 0%)
Available space: 1570878 pages ( 99%)
--- Can anyone point me to any problematic memory usage here ? Thanks in advance.
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