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

[Elliot Parkin]

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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