"David Rees" <[EMAIL PROTECTED]> wrote on 01/08/2007 01:55:18 PM:
> On 1/2/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > I routinely hit 100% CPU utilization on the Via C3 1GHz Mini-ITX
systems I
> > use as backup servers. I will grant you that the C3 is not the most
> > efficient processor, but I am definitely CPU-limited. I too have
512MB RAM,
> > but the machines are not swapping. And that's with 1 backup at a time
> > running (there is only one system to back up).
>
> Do you have a screenshot from top and a few lines of `vmstat 3`
> output?
Sure:
[EMAIL PROTECTED]:~# vmstat 3 10
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us
sy id wa
1 0 33992 684 21520 23740 2 3 36 1451 2064 1855 39
9 49 3
1 0 33992 712 21528 23824 0 0 11 41 3468 4682 82
18 0 0
1 0 33992 1088 21528 23864 0 0 3 5499 3396 4497 81
19 0 0
1 0 33992 1168 21472 23660 0 0 0 1068 3412 4586 82
18 0 0
2 0 33992 964 21436 23708 0 0 1 4411 3409 4560 81
18 0 0
1 0 33992 1048 21400 23756 0 0 0 5485 3386 4544 82
18 0 0
1 0 33992 780 21344 24076 0 0 3 5 3423 4629 83
17 0 0
1 0 33992 1092 21328 23832 0 0 0 5543 3524 4796 81
19 0 0
1 0 33992 948 21336 24084 0 0 0 1011 3531 4802 80
19 1 0
1 0 33992 744 21304 24116 0 0 0 4753 3392 4569 81
19 0 0
top - 21:09:02 up 3:55, 2 users, load average: 1.15, 1.12, 1.06
Tasks: 45 total, 2 running, 42 sleeping, 0 stopped, 1 zombie
Cpu(s): 82.1% us, 11.3% sy, 0.0% ni, 0.0% id, 0.3% wa, 2.7% hi, 3.7% si
Mem: 109068k total, 108408k used, 660k free, 21416k buffers
Swap: 385552k total, 33992k used, 351560k free, 24004k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2032 backuppc 25 0 63328 41m 3160 R 97.7 39.3 82:45.61 BackupPC_dump
44 root 15 0 0 0 0 S 0.7 0.0 0:32.12 pdflush
2022 backuppc 15 0 59552 39m 3160 S 0.7 37.1 3:41.52 BackupPC_dump
2063 root 16 0 2096 1032 1888 R 0.7 0.9 0:00.06 top
45 root 15 0 0 0 0 S 0.3 0.0 0:43.85 kswapd0
1 root 16 0 76 40 56 S 0.0 0.0 0:02.67 init
2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
4 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/0
5 root 5 -10 0 0 0 S 0.0 0.0 0:00.02 khelper
6 root 15 -10 0 0 0 S 0.0 0.0 0:00.00 kacpid
33 root 5 -10 0 0 0 S 0.0 0.0 0:00.03 kblockd/0
43 root 15 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
46 root 10 -10 0 0 0 S 0.0 0.0 0:00.00 aio/0
631 root 25 0 0 0 0 S 0.0 0.0 0:00.00 kseriod
659 root 6 -10 0 0 0 S 0.0 0.0 0:00.00 ata/0
711 root 16 0 0 0 0 S 0.0 0.0 0:00.05 kjournald
Turns out that this box only has 128MB of RAM! That will be fixed...
:) Even so, there is minimal swapping, and it does not seem to be
thrashing.
> If logging in via ssh is sluggish, that does indicate memory pressure
> to me... If you log in twice in a row is it still sluggish the second
> time or does it improve?
Actually, the sluggishness comes from I/O competition, I think, not RAM
or even CPU usage...
Tim Massey
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