[mpich-discuss] allgatherv

[Jen B]

Oh, I see. Thank you!


On Mon, May 9, 2016 at 12:27 PM, Thakur, Rajeev <thakur at mcs.anl.gov> wrote:

> Read it this way with the parenthesis:
>
> For long messages or (medium-size messages and non-power-of-two no. of
> processes)
>
>
> > On May 9, 2016, at 12:21 PM, Jen B <jenbna at gmail.com> wrote:
> >
> > Hello,
> >
> > I am looking at allgatherv.c from:
> >
> > git.mpich.org/mpich.git/tree/HEAD:/src/mpi/coll
> >
> > It says the following:
> >
> > "For short or medium-size messages and power-of-two no. of processes,
> > we use the recursive doubling algorithm.
> > ...
> > For long messages or medium-size messages and non-power-of-two
> > no. of processes, we use a ring algorithm.
> > ..."
> >
> > Could someone please tell me what algorithm is used when we have "long
> messages and power-of-two no. of processes"? Thanks a lot!
> >
> > Best,
> > Jen
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