[mpich-discuss] Problems with multiple calls to MPI_Reduce?

[Michael Ahlmann]

Elliot,
    I had a similar problem, and it was caused by using non-unique tags 
for my calls.

-Michael



Elliot Parkin wrote:
> Hello everyone,
>
> I've ran into some difficulties using MPI_Reduce. It seems that after 
> it has been called some of the parameters in the code get set to 
> bizarre values. Also, if I call MPI_Reduce consecutively (to fill an 
> array with the maximum values across the processes) it doesn't appear 
> to work the third time and sets all values of the array to zero. Has 
> anybody else had this problem, and if so is there any way to 
> explain/fix this?
>
> Cheers,
>
> Elliot Parkin.
>
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