Hi, I want to use OpenMPI dynamic collective algorithm selection using rules file, e.g.
mpirun --mca coll_tuned_use_dynamic_rules 1 --mca_coll_tuned_dynamic_rules_file rules.txt ./myexe I can see some examples in earlier discussions (given below). My question is how do I know the ID for the different collectives. I do not see coll_tuned.h in the installation folder . Is there any command to find the ID of an algorithm. I am particularly interested in Alltoallv. I have checked that coll_tuned_alltoallv_algorithm 1 and coll_tuned_alltoallv_algorithm 2 has lot of performance difference depending on data size and comm size. So I think giving a rules file can improve the performance over a range of data sizes and comm size. Any help in this regard will be appreciated. With regards, -Chandan ---------------------------------------- Dr. Chandan Basu National Supercomputer Center Linköping University S-581 83 Linköping email: cb...@nsc.liu.se ----------------------------------------- >1 # num of collectives >3 # ID = 3 Alltoall collective (ID in coll_tuned.h) >2 # number of com sizes >1 # comm size 1 >1 # number of msg sizes 1 >0 1 0 0 # for message size 0, linear 1, topo 0, 0 segmentation >8 # comm size 8 >4 # number of msg sizes >0 1 0 0 # for message size 0, linear 1, topo 0, 0 segmentation >32768 2 0 0 # 32k, pairwise 2, no topo or segmentation >262144 1 0 0 # 256k, use linear 1, no topo or segmentation >524288 2 0 0 # message size 512k+, pairwise 2, topo 0, 0 segmentation ># end of first collective --
