Hi all,<br><br>is it possible to set MCA parameters from within the MPI
program itself? The FAQ only mentions how to set them through files or
environment variables.<br><br>I would like to set coll_tuned_use_dynamic_rules and coll_tuned_alltoall_algorithm.<br>
<br>I assume there is a function to do this  in include/opal/mca but
I&#39;m not sure which one. And I couldn&#39;t find any documentation
explaining it.<br>I&#39;m aware that this will only work with OpenMPI and
is probably not part of the public api thus the interface might change
between version.<br>
<br>My plan is to benchmark all alltoall algorithms at start up and
then use this algorithm for all later AllToAll calls. I have
benchmarked that manually choosing the algorithm can make a large 
difference. Also all my alltoall communication is of the same data size
thus tuning is easy.<br>
<br>Thanks<br><blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">Roland<br clear="all"></blockquote><br>-- <br>ORNL/UT Center for Molecular Biophysics <a href="http://cmb.ornl.gov">cmb.ornl.gov</a><br>
865-241-1537, ORNL PO BOX 2008 MS6309<br>