Re: sched_yield() makes OpenLDAP slow

[Lincoln Dale]

Denis Vlasenko wrote:

> > > This is what I would expect if run on an otherwise idle machine.
> > > sched_yield just puts you at the back of the line for runnable
> > > processes, it doesn't magically cause you to go to sleep somehow.
> > >      
> > When a kernel build is occurring??? Plus `top` itself.... It damn
> > well sleep while giving up the CPU. If it doesn't it's broken.
> >    
unless you have all of the kernel source in the buffer cache, a 
concurrent kernel build will spend a fair bit of time in io_wait state ..
as such its perfectly plausible that sched_yield keeps popping back to 
the top of 'runnable' processes . . .


cheers,

lincoln.
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