[petsc-dev] Generality of VecScatter

[Jed Brown]

On Thu, Nov 24, 2011 at 15:44, Barry Smith <bsmith at mcs.anl.gov> wrote:

>   I totally agree with you on this.  Where we disagree is thatI don't
> believe that MPI or pthreads have what is needed. For example since
> pthreads sequentializes the waking up threads it cannot be used in a way
> scalable to hundreds of threads.
>

Can't the threads all be live and poll on a shared variable? Or do you need
a kernel-level primitive to activate a bunch of threads in one call? (I
think this depends whether you want to have more threads than cores.) In
any case, wouldn't that just be pthreads+1?
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