Subject: Re: [linux-audio-dev] Re: costs of IPC
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Tue May 15 2001 - 20:44:24 EEST
On Tue, May 15, 2001 at 05:20:47PM +0200, Abramo Bagnara wrote:
> >
> > I'm a little puzzled. the "sp" case doesn't have any IPC costs or
> > context switches. How can it be consuming 12-15% of the CPU time in
> > these costs? These costs are always zero for this case, surely?
>
> As far as I understand Steve has not plotted the difference but the two
> CPU usage %. The relative cost of mp approach is the difference between
> the two values.
Yes. When shared is 0, stack is constant, but not zero, and vica versa. So
osme work is being done.
I think a 2d graph of shared against stack against cpu use would be
telling, but it would take a really long time.
- Steve
This archive was generated by hypermail 2b28 : Tue May 15 2001 - 20:00:49 EEST