From: Kumar Guhan (Kumar.Guhan@janes.com)
Date: Wed May 28 2003 - 12:00:11 EDT
Hi all,
I just wanted to have an opinion on the following procedure for
ascertaining the amount of memory consumed by all the processes on a
solaris 6:
For each pid from the results of the ps command, execute the following
command:
/usr/proc/bin/pmap -x PID
which results in a output like the following:
Address Kbytes Resident Shared Private Permissions Mapped File
00010000 64 64 - 64 read/exec
syslogd
00020000 8 8 - 8 read/write/exec
syslogd
00022000 424 416 - 416 read/write/exec [
heap ]
FDC02000 8 8 - 8 read/write/exec [
anon ]
FDD04000 8 8 - 8 read/write/exec [
anon ]
FDE06000 8 8 - 8 read/write/exec [
anon ]
FDF08000 8 8 - 8 read/write/exec [
anon ]
-------- ------ ------ ------ ------
total Kb 3728 2688 1347 1344
I sum up the figure given by private total column (1344KB, 1.3 Mb) in
this example. Finally I arrive at a figure of something like 5Gb. The
system has only a 1gb physical memory. My question is, are there any
rules of thumb or anything like to say, ok if the processes are
demanding (assuming the application has been correctly configured) we
should at least have half of it as physical memory, or should the whole
5gb provided as physical memory.
Another question is the output of vmstat command, the w column, if it
contains values other than zeros (40+ in mycase) would that indicate the
system is struggling for memory?
Thanks and will summarise...
Kumar sg
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