Thanks!
Would you mind if I posted this on www.open-mpi.org?
On Apr 25, 2009, at 10:05 AM, Timothy Hayes wrote:
I uploaded it to http://www.hotshare.net/file/131218-829472246c.html
I'm not sure if it's any good or even if it's 100% accurate; but if
someone gets any use out of it, that would be good.
Tim
2009/4/17 Jeff Squyres <jsquy...@cisco.com>
On Apr 16, 2009, at 11:38 AM, Timothy Hayes wrote:
From what I understand MPI_Send will hit 3 separate layers of code
before reaching the socket file descriptors you've found. The PML
(Point to Point Messaging Layer) is a layer that bridges the MPI
semantics from the underlying point to point communications. The
standard PML implementation is called 'ob1' which is what indirectly
calls the code you found. MPI_Send should go through pml_isend() or
pml_send() which will request a BTL (Byte Transfer Layer) modules
from the BML (BTL Management Layer) and invoke the BTL's
btl_prepare_src() or btl_alloc() functions before calling the
btl_send(). It becomes clearer when you step through it all with a
debugger though ;-)
If you're interested, I've recently implemented a BTL component of
my own and am now writing up a report on the process. It will be
ready next week, so if you think it might be useful, just let me know.
Ooohh... that would be positively yummy! We can even host/link to
that on www.open-mpi.org. :-)
--
Jeff Squyres
Cisco Systems
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