Julian,

Yes, that was it.  OpenMPI 1.3 does NOT, by default, use their own memory 
allocation routines -- it is an option.  In OpenMPI 1.2 it is the default.

I downloaded and installed OpenMPI 1.3, and with it, valgrind 3.4 is 
finding the memory write errors as I'd expected.

So I can once again make good use of this wonderful tool.   Thanks.

-- Brian

Julian Seward wrote:

> 
> 3. It may be that OpenMPI is providing its own implementations of
>    malloc, free, new, delete, etc; that Memcheck doesn't know about,
>    which will also cause chaos.
> 
> 
> J


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