Hi Bogdan, Bogdan Costescu wrote:
I made some progress: if I configure with "--without-memory-manager" (along with all other options that I mentioned before), then it works. This was inspired by the fact that the segmentation fault occured in ptmalloc2. I have previously tried to remove the MX support without any effect; with ptmalloc2 out of the picture I have had test runs over MX and TCP without problems.
We have had portability problems using ptmalloc2 in MPICH-GM, specially relative to threads. In MX, we choose to use dlmalloc instead. It is not as optimized and its thread-safety has a coarser grain, but it is much more portable.
Disabling the memory manager in OpenMPI is not a bad thing for MX, as its own dlmalloc-based registration cache will operate transparently with MX_RCACHE=1 (default).
Patrick
