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Top Forums UNIX for Advanced & Expert Users How to examine the memory usage?? Post 33875 by Perderabo on Wednesday 22nd of January 2003 10:47:25 AM
Old 01-22-2003
Quote:
Originally posted by shibz
#ps -e -o pid,vsz,rss grep 21941 gives an output like,

PID VSZ RSS
21941 136168 116408

and the #pmap -x 21941 give the summary as ,

(Kb) (Resident) (Shared) (Private )
total Kb 135424 122320 16736 105584

Any clue why the memory info is different...

Thanks in advance...
When you posted this question, I tried the commands on a sample process on a 2.6 machine and both commands agreed. So I just moved on since I didn't have anything useful to say.

But I just downloaded memtool and the docs say:
Quote:
Solaris 2.6, 7 and 8 has a bug in pmap -x which will over-estimate the amount of private memory for a process. The MemTool pmem command should be used in place of pmap -x for accurate memory analysis.
I found the instructions to obtain memtool here. Click on "cool tools"; then "memtool". Also on that page, click on "pmap -x", where you will find:
Quote:
The following pmap bugids are resolved in Solaris 9:
4182712 pmap -x values for MAP_SHARED (text) segments is incorrect
4311136 pmap -x always displays ISM segments as 'private'
4449780 pmap -x doesn't provide reasonable output sometimes
4462729 pmap should also show swap reservation information
4419353 /proc//xmap extension
So you may be right about pmap.
 

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PMAP(1) 							   User Commands							   PMAP(1)

NAME
pmap - report memory map of a process SYNOPSIS
pmap [options] pid [...] DESCRIPTION
The pmap command reports the memory map of a process or processes. OPTIONS
-x, --extended Show the extended format. -d, --device Show the device format. -q, --quiet Do not display some header or footer lines. -A, --range low,high Limit results to the given range to low and high address range. Notice that the low and high arguments are single string separated with comma. -X Show even more details than the -x option. WARNING: format changes according to /proc/PID/smaps -XX Show everything the kernel provides -p, --show-path Show full path to files in the mapping column -c, --read-rc Read the default configuration -C, --read-rc-from file Read the configuration from file -n, --create-rc Create new default configuration -N, --create-rc-to file Create new configuration to file -h, --help Display help text and exit. -V, --version Display version information and exit. EXIT STATUS
0 Success. 1 Failure. 42 Did not find all processes asked for. SEE ALSO
ps(1), pgrep(1) STANDARDS
No standards apply, but pmap looks an awful lot like a SunOS command. REPORTING BUGS
Please send bug reports to <procps@freelists.org> procps-ng September 2012 PMAP(1)
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