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Date: Thu, 11 Mar 2010 00:00:24 +0100
From: "Magnum, P.I." <>
Subject: Re: Extended MPI support

> mpicc -c -Wall -O2 -fomit-frame-pointer -I/usr/local/include
> -L/usr/local/lib -funroll-loops status.c
> status.c: In function ‘status_get_cps_avg’:
> status.c:154: error: ‘MPI_UNSIGNED_LONG_LONG’ undeclared (first use in this
> function)
> status.c:154: error: (Each undeclared identifier is reported only once
> status.c:154: error: for each function it appears in.)
> make[1]: *** [status.o] Error 1
> replace MPI_UNSIGNED_LONG_LONG with just MPI_UNSIGNED_LONG on line 154 of
> status.c and all is golden.

Thanks. MPI_UNSIGNED_LONG_LONG works fine with MPICH2, are you using 
OpenMPI? I'm not sure you're safe though. I'm a complete noob at 
datatypes on different platforms, but I expect MPI_UNSIGNED_LONG to be 
just 32 bit on some, while LONG_LONG should be 64 bit. Maybe on 64-bit 
systems MPI_UNSIGNED_LONG will always do?

The reason for needing 64 bit is that it holds the total number of 
crypts performed since session started. For a fast algorithm a 32 bit 
will roll over.

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