As suggested on the mailing list a while back, switch the default alltoallv

algorithm to pairwise exchange instead of the default one. This might
improve the scheduling and relax the pressure on the network.

This commit was SVN r26246.

ompi/mca/coll/tuned/coll_tuned_decision_fixed.c

@@ -166,7 +166,7 @@ int ompi_coll_tuned_alltoallv_intra_dec_fixed(void *sbuf, int *scounts, int *sdi
                                               mca_coll_base_module_t *module)
 {
     /* For starters, just keep the original algorithm. */
-    return ompi_coll_tuned_alltoallv_intra_basic_linear(sbuf, scounts, sdisps, sdtype, 
+    return ompi_coll_tuned_alltoallv_intra_pairwise(sbuf, scounts, sdisps, sdtype, 
                                                     rbuf, rcounts, rdisps,rdtype,
                                                     comm, module);
 }