On Wed, 3 Apr 2002, Mike Silbersack wrote:
>
> On Wed, 3 Apr 2002, John Regehr wrote:
>
> > Anyway, I was speculating that the higher cost is either due to (1) a
> > failure, in FreeBSD, to avoid page table operations when switching
> > between threads in the same addres space, or (2) some other kind of
> > semantic mismatch between Linuxthreads and rfork. Is one of these
> > guesses right?
> >
> > Any help appreciated. Thanks,
> >
> > John Regehr
>
> You may be able to learn which is the case by building a kernel with
> profiling support and seeing where the hotspot is during your tests.
>
> Offhand, I'd guess that any of your ideas is possible. I don't believe
> that much time was spent optimizing the kernel for Linuxthreads.
>
> Have you tried benchmarking process to process context switch times to see
> if the results are similar?
Also:
You should run both linuxthreads binaries compile on linux (using
emulation) and compiled on FreeBSD. it would be interesting to see
if there is a difference..
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