A binary tree is the implementation of last resort.

See these papers for details of the MPI collective implementations on Blue Gene:
- http://dx.doi.org/10.1177/1094342014552086
- http://dx.doi.org/10.1109/HOTI.2009.12
(this is not an inclusive list)

http://lists.mpich.org/pipermail/discuss/2015-March/003754.html has some related info.

Jeff

On Wed, Nov 18, 2015 at 12:53 PM, Jen B <jenbna@gmail.com> wrote:
Hello,

I have a couple of questions about BG/Q collectives and would appreciate any help. 
I was wondering if Do IBM BG/Q MPI collectives use binomial tree? 
Once I find the name of the algorithm used by the MPI collective routine using MPIX_Get_last_algorithm_name, is there a quick reference or guide to check how it is implemented? 

Thanks!
Jen


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--
Jeff Hammond
jeff.science@gmail.com
http://jeffhammond.github.io/