Negative caching
Karl F. Larsen
klarsen1 at gmail.com
Fri Jun 19 08:03:02 UTC 2009
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hal Burgiss wrote:
> On Fri, Jun 19, 2009 at 12:20:00AM -0600, Karl F. Larsen wrote:
>> Slow can be a shortage of RAM. And I think you have lots but it might
>> not all may be working. Use a Terminal with top to measure your RAM and
>> swap usage. Let us know what it shows when you you slow down.
>
> I guess you missed the original post:
>
> atop data:
>
> PRC | sys 0.76s | user 1.70s | #proc 200 | #zombie 2 | #exit ?
> CPU | sys 7% | user 17% | irq 1% | idle 0% | wait 75%
> CPL | avg1 2.90 | avg5 2.54 | avg15 2.23 | csw 9527 | intr 5228
> MEM | tot 992.4M | free 91.3M | cache 316.9M | buff 3.2M | slab 44.1M
> SWP | tot 2.9G | free 1.4G | | vmcom 3.2G | vmlim 3.3G
> PAG | scan 10364 | stall 0 | | swin 4293 | swout 585 (red)
> DSK | sda | busy 100% | read 1625 | write 608 | avio 4 ms (red)
>
> That was after a long idle period when everything was really slow, response to
> mouse clicks, keyboard events, etc. Click on a background window, wait 5-6
> seconds for it to start to come to the foreground. That kind of thing (and no
> compiz!).
>
> As you can see, there is plenty of free swap space. You can also see the
> PAGING and DISK utilization stats are off the charts. There was no user
> initiated disk intensive activity at the time. None. No downloads going on, no
> copying, no unpacking, rsyncing, etc. The disk usage you see there was in
> response to simple mouse clicks (like to raise a window) and/or keyboard
> like typing in a text terminal.
>
> If its not kernel swap, its something horribly askew in 9.04 (at least on my
> system). The same system has run 7.04, 7.10, and 8.04 just fine. 8.10 was a
> trainwreck (because intel chipset debacle). 9.04 is better, but it is a system
> that requires rebooting occasionally to be functional (at least the desktop).
> This is like one step forward, and 3 steps backwards. The notion of rebooting
> to maintain system integrity just rubs me the wrong way. This is a microsoft
> legacy.
>
> To compare, current atop:
>
> PRC | sys 0.66s | user 1.68s | #proc 180 | #zombie 0 | #exit ? |
> CPU | sys 7% | user 17% | irq 0% | idle 76% | wait 1% |
> CPL | avg1 0.90 | avg5 0.45 | avg15 0.43 | csw 11319 | intr 2174 |
> MEM | tot 992.4M | free 23.4M | cache 363.7M | buff 2.0M | slab 44.3M |
> SWP | tot 2.9G | free 2.1G | | vmcom 2.9G | vmlim 3.3G |
> PAG | scan 0 | stall 0 | | swin 11 | swout 0 |
> DSK | sda | busy 1% | read 12 | write 4 | avio 5 ms |
>
> halb at honey:~$ uptime
> 08:45:56 up 1 day, 14:29, 2 users, load average: 0.70, 0.45, 0.42
>
> Life is good. For now.
>
Hi Hal, I have trouble reading your "top" because I use large fonts on
my Thunderbird email client. I am just not able to see which item is
using a giant amount of RAM. This will tell you what is wrong.
For an email I think you need to attach your top data so we can read it
with Gedit. Let me attach a top and we can see if it works. It is a
pain! I had to transfer the top to Gedit and then I will try to put it here:
top - 01:59:52 up 1 day, 15:08, 2 users, load average: 0.90, 0.42, 0.20
Tasks: 124 total, 3 running, 121 sleeping, 0 stopped, 0 zombie
Cpu(s): 12.0%us, 3.3%sy, 0.0%ni, 83.3%id, 0.0%wa, 0.0%hi, 1.3%si,
0.0%st
Mem: 1034328k total, 940932k used, 93396k free, 138604k buffers
Swap: 1959920k total, 144k used, 1959776k free, 372292k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6682 karl 20 0 223m 99m 25m R 4.7 9.9 123:27.65 firefox
6045 root 20 0 93508 44m 9068 S 3.7 4.4 27:36.42 Xorg
6318 karl 20 0 40136 23m 13m S 1.7 2.3 5:29.43 gnome-panel
6499 karl 20 0 20880 11m 7044 S 1.3 1.2 0:34.33
gtk-window-deco
8502 karl 20 0 74988 20m 11m R 0.7 2.0 0:01.16
gnome-terminal
8557 karl 20 0 2308 1120 852 R 0.7 0.1 0:00.10 top
8573 karl 20 0 31112 16m 10m S 0.7 1.7 0:00.52 gedit
6387 karl 20 0 62944 31m 9532 S 0.3 3.1 6:46.49 compiz.real
Well this looks good to me now. How is it to you Hal?
73 Karl
- --
Karl F. Larsen, AKA K5DI
Linux User
#450462 http://counter.li.org.
Key ID = 3951B48D
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
iD8DBQFKO0Y2NuSIOjlRtI0RAmlEAKCumeBIy3tDQmNAWqZOdvjSgTsUmACeMjEp
+bmWn6jYNjqA6momHq740NQ=
=rMh9
-----END PGP SIGNATURE-----
More information about the ubuntu-users
mailing list