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.
quote:

> 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 -
quote:

> 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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Mark wrote:
quote:

> 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.

<snipped>

The only time that virtual memory might enter into the problem is if
the kernel itself crashes.  Other software crashes should be accompanied
by a core file (unless you have that suppressed) which should give you
some information as to why there was a failure.  The stats you included
are not indicative of a problem, and it appear that you have 11GB of
virtual memory to play with, where almost none of it is in use.
You might get a better indication by executing the "swap -l" command
(if you have it) which will tell you swap usage.

--

Fletcher Glenn

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