Barry Smith <[email protected]> writes: >> but it would be nice to have a common way to >> address other viewer implementations. > > What do you mean by this?
That we should be able to tell the VTK viewer to use MPI-IO in the same way we tell the Binary viewer or any other viewer capable of using MPI-IO. >>>> PETSc devs, do you suppose MPI-IO support is stable enough that we could >>>> make this a default? >>> >>> It is not so much a question of stability, it is more a question >>> of (I believe) MPI IO is just loads slower for what might normal >>> PETSc users use, it only pays off for large numbers of nodes. >> >> Do we have current data demonstrating that this is still the case? It's >> really a failure of the implementations if they can't fall back to the >> dumbest mechanism when it's faster. > > Oh, actually I just remembered what always drove me crazy with MPI > IO is that it saves it in native format meaning it is not portable > to all systems (which have different endian). Portability before > performance :-) Uh, MPI_Pack_external and MPI_Unpack_external?
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