Good idea Alex
There is also another version of ps that lives in /usr/ucb (University
California Berkley) that will accept the options -vx.
Ie: /usr/ucb/ps -vx this will
sort the processes by memory/cpu usage in the following format:
PID TT S TIME SIZE RSS %CPU %MEM COMMAND
There is also a program kicking around called proctool that has some fancy
graphical gui's to show you what processes are hogging all the memory/cpu
time.
But like Alex says it all boils down to the same thing in the end:
"BUY MORE RAM"
Peter Bruley
----------
From: Johnson,Alex
Sent: Tuesday, October 10, 2000 12:24 PM
To: Foxboro DCS Mail List
Subject: RE: How do I turn off swap
ps -el gives a column that shows current memory size (SZ)
* run it today: ps -ef >/opt/ps.10.10
* run it again tomorrow: ps -ef >/opt/ps.10.11
* sort them both: sort -o ps.10.10 ps.10.10 ; sort -o ps.10.11
ps.10.11
* compare the results: diff ps.10.11 ps.10.10
Look for changes in the SZ column.
Regards,
Alex Johnson
10707 Haddington
Houston, TX 77063
713.722.2859(v)
713.722.2700(sb)
713.932.0222(f)
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Ted Jirik [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, October 10, 2000 10:50 AM
To: Foxboro DCS Mail List
Subject: RE: How do I turn off swap
Hello,
You might want to make sure a third party program is not
leaking memory and consuming your swap space.
Watch programs memory usage over the period in question
and see if this might be the problem.
At 02:37 PM 10/10/00 +0000, you wrote:
Hello
While Alex is right that having more memory is
almost always a good thing, I am confused by
the results stated.
Unused processes always get paged out of main
memory (a good thing). Disk thrashing after
this point points to applications that are
memory intensive. Vanilla I/A ships with
plenty of memory resources to its job
under normal circumstances. When adding third
party applications, you will need to do some
basic system administration to verify the
system. Alex pointed you at vmstat to monitor
disk i/o. Another command that I use a lot
is "swap -s" which gives the total virtual memory
usage.
Doing this before and after an application startup
gives a relative feel for the cost of that
application.
Can you run this command and tell us what your
situation is ?
If you take away swap space and you are have quieted
down the disk drive then I suggest that you may
have an application (or several) that are no longer
running that you may not know about. Offline, Alex
suggests that you run a "ps" command before and
after the removal of swap space to verify no
lost processes.
Another reason for excess disk traffic are
applications
that write to /tmp (logfiles etc.). You may
wish to do a "ls -lart /tmp" to see what the newest
files are in this directory and maybe by the name
determine the application that is using this.
Three words:
Buy more RAM.
If vmstat reports lots of page faults, you
need more
RAM.
<snip>
I have processes running on a AW51E
(Ultra
30) that drop into
virtual memory several days after
boot.
They then consume the
machine with lots of disk thrashing.
I've
experimented with
vfstab and /sbin/swapadd, and
eliminated
swap. This stops the
disk thrashing, but it left me with
a /tmp
directory that is
small and completely memory-based.
I'm
wondering if I should
further modify /etc/vfstab, and
mount /tmp
to /dev/md/dsk/d1?
If anyone has more expert knowledge
on how
to go about this,
I'd appreciate the help.
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