[mpich-discuss] allgatherv

[Jen B]

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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