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On Jan 31, 2012, at 3:59 AM, Gabriele Fatigati wrote:
> I have very interesting news. I recompiled OpenMPI 1.4.4 enabling the memchecker.
> Now the warning on strcmp is disappeared also without buffers initializations using memset!
> So the warning is a false positive? My simple code is safe?
If you were using IB as the network transport, yes, it's a false positive.
With memchecker enabled, Open MPI will *always* tell Valgrind that the entire contents of the buffer are defined, even when the data is coming from an OS-bypass transport (such as an OpenFabrics-based device, like IB).
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