On Jun 5, 2013, at 10:52 PM, Haggai Eran <[email protected]> wrote:
>> Haggai: A verb to resize a registration would probably be a helpful
>> step. MPI could maintain one registration that covers the sbrk
>> region and one registration that covers the heap, much easier than
>> searching tables and things.
>
> That's a nice idea. Even without this verb, I think it is possible to
> develop a registration cache that covers those regions though. When you
> find out you have some part of your region not registered, you can
> register a new, larger region that covers everything you need. For new
> operations you only use the newer region. Once the previous, smaller
> region is not used, you de-register it.
I'm not sure what you mean. Are you saying I should do something like this:
MPI_Init() {
// the first MPI function invoked
mpi_sbrk_save = sbrk();
ibv_reg_mr(..., 0, mpi_sbrk_save, ...);
...
}
MPI_Send(buffer, ...) {
if (mpi_sbrk_save != sbrk())
mpi_sbrk_save = sbrk();
ibv_rereg_mr(..., 0, mpi_sbrk_save, ...);
...
}
I don't think this covers other memory regions, like those added via mmap,
right?
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Jeff Squyres
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