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Re: Bug/limitation in 'time' (kernel setings?)...
From: |
Linda Walsh |
Subject: |
Re: Bug/limitation in 'time' (kernel setings?)... |
Date: |
Tue, 19 Mar 2013 08:18:35 -0700 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.24) Gecko/20100228 Lightning/0.9 Thunderbird/2.0.0.24 Mnenhy/0.7.6.666 |
I think you misunderstand...what Pierre is saying -- your process
is scheduled out to give others a *chance* to run and the scheduler
isn't called often enough to roll you back in immediately when it
finds out that no one else needs their time ticks...
That's why I mentioned all of the scheduling info in the kernel.
Another thing to play with is length of time slices, but I have
a feeling as soon as you hit the eval you are yielding the cpu
to the scheduler, so while you may be *waiting* 100% on the cpu,
much of that is spent waiting for cpu, not using cpu.
Bruce Dawson wrote:
> Thanks Pierre.
>
> The profile results, especially the zoom profiler screen shot, show that
> virtually all of the CPU time being consumed is from bash and its child
> processes. The system is otherwise idle with no other processes running to
> any significant degree. My system is ~99.5% idle when I'm not running the
> test, and ~91.5% idle when the test is running.
> -----Original Message-----
> From: Pierre Gaston [mailto:pierre.gaston@gmail.com]
> For what it's worth, I still thinks that time is not lying (though the man
> page warns about possible inaccuracies), Your loop with expr might be "cpu
> bound" but it does not run often because other processes are given a chance
> to run.
>
>
- Re: Bug/limitation in 'time', (continued)
- Re: Bug/limitation in 'time', Pierre Gaston, 2013/03/17
- Re: Bug/limitation in 'time', Hans J. Albertsson, 2013/03/17
- Re: Bug/limitation in 'time', William Park, 2013/03/17
- Re: Bug/limitation in 'time', Chris Down, 2013/03/17
- Re: Bug/limitation in 'time', Chris F.A. Johnson, 2013/03/17
- Re: Bug/limitation in 'time', Dan Douglas, 2013/03/17
Re: Bug/limitation in 'time' (kernel setings?)..., Linda Walsh, 2013/03/18
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/18
- Re: Bug/limitation in 'time' (kernel setings?)..., Pierre Gaston, 2013/03/19
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/19
- Re: Bug/limitation in 'time' (kernel setings?)...,
Linda Walsh <=
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/19
- Re: Bug/limitation in 'time' (kernel setings?)..., Linda Walsh, 2013/03/19
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/19
- Re: Bug/limitation in 'time' (kernel setings?)..., Linda Walsh, 2013/03/19
- Re: Bug/limitation in 'time' (kernel setings?)..., Linda Walsh, 2013/03/19
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/20
- Re: Bug/limitation in 'time' (kernel setings?)..., Linda Walsh, 2013/03/20
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/20
- RE: Bug/limitation in 'time' (kernel setings?)..., Bruce Dawson, 2013/03/20
- Re: Bug/limitation in 'time' (kernel setings?)..., Linda Walsh, 2013/03/20