[mpich-discuss] mpi_scatter

[Jen B]

In particular, it is essential for me to know what happens when the
mpi_scatter is run on non-power of two number of processes. I have looked
into the scatter.c file comments, but it is not mentioned anywhere there.
Thanks!

Best,
Jen

On Sat, Dec 5, 2015 at 1:05 PM, Jen B <jenbna at gmail.com> wrote:

> Hi,
>
> Sorry for bugging you guys again, I have a couple of things I wanted to
> make sure about.
>
> So mpi_scatter uses a binomial tree. If, for example, I have processes p0,
> p1, p2, p3. Then the binomial tree would be p0 -> p1,p0 -> p2,p2 -> p3. For
> my total message n, the parts that need to send to the processes are n0,
> n1, n2, n3. Then, will p0->p1 have only n1 in transit, and p0->p2 have
> n2+n3 in transit, and finally p2->p3 have n3 in transit?
>
> And how would the binomial tree be built for processes p0,p1,p2,p3,p4? Is
> it as above with addition of p0->p4 (i.e., we get closest binomial tree and
> add the rest to p0)?
>
> Any help will be greatly appreciated!
>
> Best,
> Jen
>
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