Solaris

Can some one please explain what does the memory part mean in the prstat logs?
NPROC USERNAME SIZE RSS MEMORY TIME CPU
61 oracle 36G 33G 71% 109:44:26 12%
89 cemsbin 12G 9523M 20% 195:02:41 11%
2 adm 273M 199M 0.4% 47:05:42 2.3%
89 root 2499M 787M 1.6% 14:31:42 2.2%
3 nortel 2776K 2272K 0.0% 0:00:01 1.1%

What does the %Memory denote?
How does the prstat calculate %memory?

Thanks in advance.

check the manual page: -
#man prstat

thanks for the response but there is no explanation about the memory uasage.
How is it calculated?

Remember, "size" is the virtual address space size,
the "rss" column is physical memory, which is
typically more useful for memory sizing.

You can also use "memstat", which is an mdb(1) dcmd, as in;

#echo "::memstat" | mdb -k

This may take some time on a large memory configuration.

Use "prstat -s rss" to sort processes by memory usage and determine
how much physical memory is being used (RSS). You can not add these up for a total of how much memory is being used by all processes, because shared segments are not accounted for. Run "pmap -x [PID]" per-process for a detailed view.

Hey thanks for the response.

In one instance the prstat log shows:-
NPROC USERNAME SWAP RSS MEMORY TIME CPU
15 cemsbin 280M 212M 2.6% 0:05:28 1.8%
6 cemsadm 5096K 8592K 0.1% 0:02:51 0.8%
2 adm 228M 371M 4.5% 4:34:12 0.6%
54 root 301M 277M 3.4% 3:49:36 0.1%
16 bsmbin 63M 116M 1.4% 0:12:16 0.0%
4 oracle 7592K 32M 0.4% 0:00:02 0.0%
Total: 104 processes, 547 lwps, load averages: 1.87, 2.06, 2.43

And from the prtconf command:-
-bash-3.2# prtconf | more
System Configuration: Sun Microsystems sun4u
Memory size: 8192 Megabytes
System Peripherals (Software Nodes):
SUNW,Sun-Fire-V240
scsi_vhci, instance #0
packages (driver not attached)
SUNW,builtin-drivers (driver not attached)
deblocker (driver not attached)
disk-label (driver not attached)
terminal-emulator (driver not attached)
dropins (driver not attached)
kbd-translator (driver not attached)
obp-tftp (driver not attached)
SUNW,i2c-ram-device (driver not attached)
SUNW,fru-device (driver not attached)

If I do (RSS/Memory size) i.e.(32/8192 * 100) i get .39% which is in sync with what is being shown in the prstat log.

But in the different prstat log:-
NPROC USERNAME SIZE RSS MEMORY TIME CPU
55 cemsbin 20G 19G 23% 0:15:43 5.1%
3 sys 4424K 3640K 0.0% 0:00:00 1.0%
2 adm 412M 192M 0.2% 0:01:39 0.8%
73 oracle 61G 59G 73% 0:00:05 0.6%
52 root 486M 285M 0.3% 0:01:02 0.4%
Total: 226 processes, 1886 lwps, load averages: 0.97, 0.94, 0.88

The logic above mentioned does not hold true.
I want to know how is this %memory calculated.

Please respond.

The 2nd prstat log is from a different system is it?

Yes it is from a different system .
But I want a link between the %memory usage and rss.

Does it follow any algorithm or rule to clculate the %memory usage or it is random...