If the run my compute intensive openmpi based program using regular invocation of mpirun (ie; mpirun –host <hostnamelist> -np <number of cores>), it gets completed in few seconds but if I run the same program with “-am ft-enable-cr” option, the program takes 10x time to complete.


If I enable hyperthreading on my cluster nodes and then call mpirun with “-am ft-enable-cr” option, the program gets completed with few additional seconds than the normal mpirun!!


How can I improve the performance of mpirun with “-am ft-enable-cr” option when I disable hyperthreading on my cluster nodes? Any pointers will be really useful.


FYI, I am using openmpi 1.3.4 library and BLCR 0.8.2. Cluster nodes are Nehalem based nodes with  8 cores.



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