Re: Help understanding slow down

Phy Prabab
2004-05-24T01:52:40Z

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Okay, so ran the test with vmstat running. I ran it
capturing every 1 sec. Here is an excert:

procs memory swap
io system cpu
r b swpd free buff cache si so bi
bo in cs us sy id wa
1 0 0 8153848 17000 82348 0 0 0
0 4568 4028 6 16 78 0
0 1 0 8154168 17008 82340 0 0 0
160 4596 4079 7 17 76 1
1 0 0 8153848 17008 82340 0 0 0
0 4511 3998 7 16 76 0
1 0 0 8153912 17008 82340 0 0 0
0 4460 3952 7 14 79 0
1 0 0 8153784 17016 82332 0 0 0
0 4437 3962 7 16 77 0
1 0 0 8153528 17016 82332 0 0 0
0 4444 3927 7 14 78 0
1 1 0 8153784 17024 82392 0 0 0
144 4399 3895 7 15 77 1
0 0 0 8153592 17024 82392 0 0 0
0 4367 3821 7 15 78 0
1 0 0 8153848 17024 82392 0 0 0
0 4393 3926 6 16 78 0
1 0 0 8153528 17024 82460 0 0 0
0 4438 3960 8 14 78 0
1 0 0 8154040 17024 82460 0 0 0
0 4415 3912 6 15 78 0
1 1 0 8153720 17032 82452 0 0 0
140 4457 3953 7 15 77 1
1 0 0 8153784 17032 82452 0 0 0
0 4437 3889 7 14 79 0
0 0 0 8153784 17040 82444 0 0 0
0 4398 3903 8 15 77 0
1 0 0 8153464 17040 82444 0 0 0
0 4398 3902 7 14 79 0
0 0 0 8153528 17040 82444 0 0 0
0 4447 3922 6 17 77 0
0 1 0 8153720 17052 82432 0 0 0
144 4490 3960 6 16 77 1
0 0 0 8153656 17056 82428 0 0 0
0 4449 3954 7 15 78 0

--- William Lee Irwin III <wli@holomorphy.com> wrote:
> On Mon, May 24, 2004 at 03:25:53AM +0200, Jakob
> Oestergaard wrote:
> > Eh, not if I read the numbers right:
> > 2.6.7-p1: 24.86user 51.77system 2:58.87elapsed
> 42%CPU
> > 24.86 + 51.77 = 76.63 seconds on CPU, 102.24
> seconds of waiting
> > 2.4.21: 28.68user 34.98system 1:12.34elapsed
> 87%CPU
> > 28.68 + 34.98 = 63.66 seconds on CPU, 8.68 seconds
> of waiting
> > So, 2.6.7-p1 spends 16.79 seconds more in the
> kernel as you observed,
> > but it spends 93.56 seconds more waiting for I/O
> (or whatever).
> > Unless I'm totally missing something, the wait
> seems to be the
> > regression.
>
> I'm sorry, you're right. Let's start by looking into
> IO activity.
> Phy, could you log the output of vmstat(1) during
> the runs?
>
>
> -- wli
> -
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