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SubjectRe: Interesting analysis of linux kernel threading by IBM

On Thu, 20 Jan 2000, Larry McVoy wrote:

> This is a completely unsubstatiated statement. OK, everyone, do this:
>
> $ vmstat
> load free cach swap pgin pgou dk0 dk1 dk2 dk3 ipkt opkt int ctx usr sys idl
> 0.00 4.3 96.9 0.4 0 0 0 0 0 0 0 0 104 53 0 3 97
>
> Those people with the load field higher than 10, please tell us what you are
> doing.

Hum, its not quite 10 right now (and hopefully won't be again soon) It did
hit 40 the other day mind you:

saens{jgg}~#vmstat
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
4 3 0 3396 1628 14816 127560 0 0 1 1 0 2 1 1 2
saens{jgg}~#ps aux | wc -l
182
saens{jgg}~#w
7:00pm up 187 days, 2:36, 1 user, load average: 6.34, 4.39, 3.29
saens{jgg}~#procinfo
Linux 2.2.10-ac10 (root@saens) (gcc 2.7.2.3) #2 1CPU [saens.(none)]

Memory: Total Used Free Shared Buffers Cached
Mem: 258164 255652 2512 198252 5904 117388
Swap: 118448 3396 115052

Bootup: Sat Jul 17 17:23:25 1999 Load average: 6.21 5.16 3.73 1/188
22237

user : 22d 11:50:33.70 12.0% page in :3070841179 disk 1: 937666119r291450156w
nice : 3:33:00.93 0.1% page out:491514704
system: 16d 7:50:14.17 8.7% swap in : 568142
idle : 148d 3:25:23.25 79.2% swap out: 32739
uptime: 187d 2:39:11.89 context :2308759798

This machine is ftp.debian.org - two days ago it sent out a more than 180G
of traffic (145G via FTP, rest HTTP/rsync) over a 1 day period. Which is
what, 1/7th the size of cdrom.com? We run Apache and wu-ftpd (though we
switched to proftpd two days ago..) Machine is PII-350, 256Meg ram and a
3x9G RAID5 on a ICP Vortex RAID controller

The biggest load generator is really rsync, followed by proftpd, both when
they do ls -LR's :< I don't get a feeling that schedualing is a big
concern here.

Enjoy,
Jason


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