A process may use a large amount of memory, but only a small portion
is being actively used.
In windows the virtual size is meaningless as it is just the
"promised" space for the process, which isn't necessarily mapped to
memory or swap. In linux, from my 10 mins of googling, seems that the
virtual size means the actual total memory used by the process
(memory+swap). If this is the case, thunderbird has 143m in swap 12m
in memory using a total of 155m.
This may be useful:
http://mail.nl.linux.org/linux-mm/2003-03/msg00077.html
5. Per Process Memory Usage
The inputs to this section were obtained with the command:
ps -eo pid,ppid,rss,vsize,pcpu,pmem,cmd -ww --sort=pid
The command "ps" is a c program that reads the "/proc"
filesystem.
There are two elements that are useful when determining the per
process memory usage. They are:
a. RSS
b. VSIZE
A graph of RSS per unit time will show how much RAM the process is
using over time.
A graph of VSIZE per unit time will show how large the process is
over time.
On 4/1/07, David Timms <dtimms@xxxxxxxxxxxx> wrote:
Hi all,
With updated fc6, I have left my PC on for the last few days, and
noticed it was really slow {I was doing a nice'd clamscan of the whole
disk}. The machine has 512MB ram, but just before I took this text
capture, I had firefox running virt=260MB {this had also caused java_vm
to be running virt=230MB} ie 512MB ram just for these two - does this
seem normal ?
=====
top - 06:24:42 up 1 day, 18:55, 3 users, load average: 0.58, 0.84, 1.57
Tasks: 142 total, 1 running, 141 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.0%us, 1.0%sy, 0.0%ni, 95.3%id, 0.0%wa, 0.3%hi, 0.3%si,
0.0%st
Mem: 514160k total, 298600k used, 215560k free, 5172k buffers
Swap: 1859808k total, 236808k used, 1623000k free, 145220k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4379 18 0 155m 12m 5960 S 0.0 2.5 2:03.21 thunderbird-bin
3176 15 0 133m 1144 324 S 0.0 0.2 0:04.03 mysqld
3728 15 0 124m 13m 4496 S 0.3 2.7 1:09.55 nautilus
3822 15 0 101m 748 748 S 0.0 0.1 0:00.26 trashapplet
3751 15 0 89664 6476 1520 S 0.0 1.3 0:21.98 beagled
3949 15 0 86840 9704 3500 S 1.3 1.9 0:40.55 gnome-terminal
3726 23 0 82188 4220 2192 S 0.0 0.8 0:07.21 gnome-panel
4017 16 0 81380 560 560 S 0.0 0.1 0:00.07 evolution-data-
3877 15 0 81072 3060 1828 S 0.0 0.6 2:36.41 clock-applet
3618 15 0 73008 22m 3476 S 1.7 4.6 27:05.54 Xorg
3791 15 0 66888 5964 4180 S 0.0 1.2 0:41.61 wnck-applet
3879 15 0 66160 1064 804 S 0.0 0.2 0:01.90 mixer_applet2
3710 15 0 65268 1256 920 S 0.0 0.2 0:01.96 gnome-power-man
3753 15 0 63296 1228 844 S 0.0 0.2 0:01.73 nm-applet
3978 18 0 58344 1904 1188 S 0.0 0.4 0:02.95 notification-da
3732 23 0 48748 492 492 S 0.0 0.1 0:00.18 bonobo-activati
3738 24 0 44344 1012 808 S 0.0 0.2 0:01.09 eggcups
4701 30 15 35740 14m 7624 S 0.0 2.9 0:01.63 beagled-helper
3701 15 0 33948 1664 1176 S 0.0 0.3 0:07.33 gnome-settings-
1952 15 0 33816 17m 2252 S 0.0 3.5 7:14.16 yum-updatesd
3748 15 0 25140 3856 2228 S 0.0 0.7 0:00.63 puplet
2923 18 0 22936 456 348 S 0.0 0.1 0:01.36 pcscd
=====
Thanks for any pointers or comparison values. I notice that at least
clock-applet is no longer consuming tonnes of memory {another machine
after being up 60 days was using virt 800+MB just for clock applet}.
DaveT
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Chu Jeang Tan
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