Correct. With the exception of MPI_BOOL / MPI_LOGICAL, we do not handle sending datatypes that are different sizes on the sender and receiver. So sending an MPI_LONG from a 32 bit machine to a 64 bit machine will not work correctly.
Brian On Wed, 2006-08-30 at 10:33 -0400, Jeff Squyres wrote: > Oops! My mistake -- thanks for the correction... > > I am still correct in thinking that we do not properly handle *size* > endianness, right? Meaning that if sizeof(long) on one node is different > than sizeof(long) on another, running an MPI job across those two nodes will > cause Bad Things to occur if you try to exchange MPI_LONGs between the MPI > processes, right? (and similar for other datatypes that are different > sizes) > > > On 8/30/06 9:38 AM, "Brian Barrett" <brbar...@open-mpi.org> wrote: > > > Actually, Jeff is incorrect. As of Open MPI 1.1, we do support endian > > conversion between peers. It has not been as well tested as the rest of > > the code base, but it should work. Please let us know if you have any > > issues with that mode and we'll work to resolve them. > > > > Brian > > > > > > On Wed, 2006-08-30 at 06:36 -0400, Jeff Squyres wrote: > >> Open MPI does not yet support endian conversion between peers in a single > >> MPI job. It's on the to-do list, but it's been a lower priority than some > >> other features and issues. > >> > >> > >> > >> On 8/30/06 4:12 AM, "Eng. A.A. Isola" <alfonso.is...@tin.it> wrote: > >> > >>> Hi everybody, > >>> > >>> I got one doudt in OPEN-MPI. Suppose, if > >>> i > >>> run the application on different systems with different data formats > >>> (little-endian & big endian)...Willl OPEN-MPI converts from little > >>> endian > >>> to big-endian(if it is sending data from for eg, Linux Pc & > >>> Solaris).... > >>> > >>> If it isn't able to do this, it will be able in the > >>> future releases? (is in your to do list?) > >>> > >>> Thanking u for ur response, > >>> > >>> A.A. Isola > >>> > >>> _______________________________________________ > >>> users mailing list > >>> us...@open-mpi.org > >>> http://www.open-mpi.org/mailman/listinfo.cgi/users > >> > > > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > >
