Dear experts, can someone tell whether there is some known issue with MPI::allreduce in release 1.4.x that one should be aware of? The comparison of the performances of one application with Openmpi 1.4 and Openmpi 1.10.4 shows some uge differences, that I fail to understand. Of course, I could simply switch to 1.10.X version for Openmpi, but, one of the clusters I am currently using supports release 1.4 only. thanks for your help.
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