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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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WINCACHE_UCACHE_MEMINFO(3)						 1						WINCACHE_UCACHE_MEMINFO(3)

wincache_ucache_meminfo - Retrieves information about user cache memory usage

SYNOPSIS
array wincache_ucache_meminfo (void ) DESCRIPTION
Retrieves information about memory usage by user cache. RETURN VALUES
Array of meta data about user cache memory usage or FALSE on failure The array returned by this function contains the following elements: o memory_total - amount of memory in bytes allocated for the user cache o memory_free - amount of free memory in bytes available for the user cache o num_used_blks - number of memory blocks used by the user cache o num_free_blks - number of free memory blocks available for the user cache o memory_overhead - amount of memory in bytes used for the user cache internal structures EXAMPLES
Example #1 A wincache_ucache_meminfo(3) example <pre> <?php print_r(wincache_ucache_meminfo()); ?> </pre> The above example will output: Array ( [memory_total] => 5242880 [memory_free] => 5215056 [num_used_blks] => 6 [num_free_blks] => 3 [memory_overhead] => 176 ) SEE ALSO
wincache_fcache_fileinfo(3), wincache_fcache_meminfo(3), wincache_ocache_fileinfo(3), wincache_rplist_fileinfo(3), wincache_rplist_mem- info(3), wincache_refresh_if_changed(3), wincache_ucache_info(3), wincache_scache_info(3), wincache_scache_meminfo(3). PHP Documentation Group WINCACHE_UCACHE_MEMINFO(3)
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