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Full Discussion: Understanding prstat
Operating Systems Solaris Understanding prstat Post 302792417 by jlliagre on Wednesday 10th of April 2013 11:21:09 AM
Old 04-10-2013
Quote:
Originally Posted by abohmeed
What i don't understand is: I have over a dozen processes each having an RSS of 14G how can that be possible if the total memory i have (physical + swap) is only 64GB?
That's because of shared memory which is accounted for each process using it.
Quote:
Another thing, when i run prstat -a to see the summary I have memory consumption about 36% which i think is pretty misleading.
Why do you thing it is misleading ?
Quote:
So how do i interpret the output of prstat, how can i know whether or not i am using SWAP space because this will definitely degrade the DB performance and pushes us towards the direction of upgrading memory?
prstat is not the the right tool to use if you want to know if pagination occurs because of RAM exhaustion. You should instead have a look to vmstat output, especially the free and sr columns. swap -s and swap -l would also help.
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abohmeed
 

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LEARN ABOUT MOJAVE

topsysproc

topsysproc(1m)							   USER COMMANDS						    topsysproc(1m)

NAME

       topsysproc - top syscalls by process name. Uses DTrace.

SYNOPSIS

       topsysproc [-Cs] [interval [count]]

DESCRIPTION

       This  program  continually  prints  a  report of the number of system calls by process name, and refreshes the display every 1 second or as
       specified at the command line. Similar data can be fetched with "prstat -m".

       Since this uses DTrace, only users with root privileges can run this command.

OPTIONS

       -C     don't clear the screen

       -s     print per second values

EXAMPLES

       Default output, 1 second updates,
	      # topsysproc

       Print every 5 seconds,
	      # topsysproc 5

       Print a scrolling output,
	      # topsysproc -C

FIELDS

       load avg
	      load averages, see uptime(1)

       syscalls
	      total syscalls in this interval

       syscalls/s
	      syscalls per second

       PROCESS
	      process name

       COUNT  total syscalls in this interval

       COUNT/s
	      syscalls per second

NOTES

       There may be several PIDs with the same process name.

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       topsysproc will run until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M), prstat(1M)

version 0.90							   Jun 13, 2005 						    topsysproc(1m)
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