What is the difference between connectivity_c and ring_c or hello_c? Under what circumstances should one fail and not the others...
I am having a huge problem with openMPI, and trying to get to the bottom of it by understanding the differences between the example files, connectivity, hello, and ring.
1st off, ring_c and hello_c seem to work fine with up to -np 250
connectivity_c works reliably when -np <5, but less that 30% of the time when -np >6. When it does not work, it just hangs.. no output.. here is a screenshot of TOP with mpirun -np 8 connectivity_c hanging..
Under what circumstances should this happen?
I am using Ubuntu 9.10, kernel 2.6.31-16, Nehelem processors. Hyperthreading is enabled.
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