hello,
my system is updated Rawhide x86_64.
It has 2Gb of ram.
This is output of free command at a certain point (single user inside
gnome, with compiz, openoffice, firefox, thunderbird and some
terminals..)
[root@tekkafedora ~]# free
total used free shared buffers cached
Mem: 2037860 1769648 268212 0 271600 580764
-/+ buffers/cache: 917284 1120576
Swap: 506008 0 506008
I start a guest with CentOS 5.3 x86_64, giving it 768Mb of ram.
Command line is:
qemu-kvm -m 768 -drive file=centos53_hd1.raw,if=virtio,boot=on -net
nic,model=virtio -net user -localtime
When the guest arrives at gdm login, on my physical machine the
situation is now:
[root@tekkafedora ~]# free
total used free shared buffers cached
Mem: 2037860 2019280 18580 0 86856 660332
-/+ buffers/cache: 1272092 765768
Swap: 506008 17748 488260
Is this assumed ok, in general and in rawhide in particular?
I would expect the system not to begin to swap at all, but eventually
reduce the cached part...
After I login in Xorg CentOS guest, on it I see:
[root@localhost ~]# free
total used free shared buffers cached
Mem: 767976 531840 236136 0 21780 345436
-/+ buffers/cache: 164624 603352
Swap: 1048568 0 1048568
Top on physical machine, sorted by memory gives at this point: that
qemu-kvm is using 1070Mb.. even if I configured it for 768....??
[root@tekkafedora ~]# top
top - 11:25:02 up 2:27, 7 users, load average: 0.32, 0.84, 0.63
Tasks: 180 total, 2 running, 178 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.4%us, 3.1%sy, 0.0%ni, 94.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2037860k total, 2019608k used, 18252k free, 80900k buffers
Swap: 506008k total, 20556k used, 485452k free, 503556k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4379 gcecchi 20 0 1070m 592m 4472 S 6.4 29.8 1:28.94 qemu-kvm
2814 gcecchi 20 0 769m 193m 24m S 1.0 9.7 9:56.50 firefox
2964 gcecchi 20 0 1511m 135m 78m S 0.0 6.8 1:51.28 scalc.bin
2083 root 20 0 325m 130m 13m R 1.5 6.5 10:44.18 Xorg
2778 gcecchi 20 0 734m 81m 26m S 0.0 4.1 0:34.75 thunderbird-bin
2645 gcecchi 20 0 486m 33m 14m S 0.0 1.7 0:01.47 tomboy
2709 gcecchi 20 0 175m 32m 21m S 0.0 1.7 2:24.78 compiz
2440 gcecchi 20 0 758m 28m 16m S 0.0 1.4 0:07.02 nautilus
2679 gcecchi 20 0 330m 23m 14m S 0.0 1.2 0:00.75 fusion-icon
3361 gcecchi 20 0 636m 20m 11m S 0.0 1.0 0:16.12 gedit
2448 gcecchi 20 0 310m 17m 8468 S 0.0 0.9 0:00.26 python
2425 gcecchi 20 0 323m 17m 10m S 0.0 0.9 0:05.52 gnome-panel
3210 gcecchi 20 0 280m 16m 8776 S 0.5 0.8 0:22.27 gnome-terminal
2657 gcecchi 20 0 860m 15m 10m S 0.0 0.8 0:00.68 clock-applet
2459 gcecchi 20 0 279m 12m 9288 S 0.0 0.6 0:00.27 nm-applet
2605 gcecchi 20 0 305m 12m 8256 S 0.0 0.6 0:09.17 wnck-applet
2465 gcecchi 20 0 472m 12m 8220 S 0.0 0.6 0:02.09 gnome-power-man
than if in guest I start jboss 4.3 with initial parameters of
JAVA_OPTS="-Xms384m -Xmx512m -XX:PermSize=256m -XX:MaxPermSize=256m
-Dsun.rmi.dgc.client.gcInterval=3600000
-Dsun.rmi.dgc.server.gcInterval=3600000
-Dsun.lang.ClassLoader.allowArraySyntax=true"
java should ave an initial memory footprint of 640MB
free gives on it:
total used free shared buffers cached
Mem: 767976 761416 6560 0 15264 272416
-/+ buffers/cache: 473736 294240
Swap: 1048568 0 1048568
here in effect it seems that cached part has benn reduced in favour of
memory requested...
but top sorted by mem shows 1147m for java...... instead of the
expected 640mb.....
[gcecchi@localhost ~]$ top
top - 11:41:25 up 22 min, 3 users, load average: 0.59, 0.30, 0.19
Tasks: 116 total, 6 running, 110 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.8%us, 0.8%sy, 0.0%ni, 97.6%id, 0.0%wa, 0.0%hi, 0.8%si, 0.0%st
Mem: 767976k total, 761024k used, 6952k free, 15272k buffers
Swap: 1048568k total, 0k used, 1048568k free, 271624k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2982 jboss 24 0 1147m 307m 11m S 0.0 40.9 0:26.85 java
2778 gcecchi 17 0 339m 27m 11m S 0.0 3.7 0:00.33 puplet
2738 gcecchi 15 0 371m 16m 11m S 0.0 2.1 0:00.50 nautilus
2833 gcecchi 15 0 262m 15m 8480 R 0.0 2.1 0:01.90 gnome-terminal
2406 root 35 19 250m 15m 2164 S 0.0 2.0 0:00.07 yum-updatesd
2736 gcecchi 15 0 270m 12m 8344 S 0.0 1.6 0:00.25 gnome-panel
2804 gcecchi 15 0 272m 10m 7724 S 0.0 1.5 0:00.09 mixer_applet2
2788 gcecchi 15 0 258m 10m 7276 R 0.0 1.3 0:00.29 wnck-applet
2633 root 15 0 89268 9920 5820 S 0.8 1.3 0:08.21 Xorg
2766 gcecchi 15 0 223m 9464 7400 S 0.0 1.2 0:00.09 nm-applet
2809 gcecchi 15 0 265m 9324 6824 S 0.0 1.2 0:00.07 clock-applet
2793 gcecchi 15 0 287m 7932 6104 S 0.0 1.0 0:00.05 trashapplet
2732 gcecchi 15 0 150m 7776 5828 R 0.0 1.0 0:00.48 metacity
2717 gcecchi 15 0 257m 7324 5636 R 0.0 1.0 0:00.27 gnome-settings-
2747 gcecchi 15 0 264m 7252 5656 S 0.0 0.9 0:00.04 eggcups
2807 gcecchi 15 0 235m 6748 5420 S 0.0 0.9 0:00.04 notification-ar
2014 root 18 0 151m 6712 952 S 0.0 0.9 0:00.03 python
any explanation of behaviours and/or pointers?
or any tool to better and more precisely track actual memory
footprints for processes on a server?
Thanks in advance,
Gianluca
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