The correct MCA parameters are the following:
-mca coll_tuned_use_dynamic_rules 1
-mca coll_tuned_dynamic_rules_filename ./dyn_rules
Ohh..it was my mistake....
You can also run the following command:
ompi_info -mca coll_tuned_use_dynamic_rules 1 -param coll tuned
This will give some insight into all the various algorithms that make
up the tuned collectives.
If I am understanding what is happening, it looks like the original
MPI_Alltoall made use of three algorithms. (You can look in
coll_tuned_decision_fixed.c)
If message size < 200 or communicator size > 12
bruck
else if message size < 3000
basic linear
else
pairwise
end
Yep it is correct.
With the file Pavel has provided things have changed to the following.
(maybe someone can confirm)
If message size < 8192
bruck
else
pairwise
end
You are right here. Target of my conf file is disable basic_linear for
medium message side.
Pasha.
