Hi George,
4) Well, this sounds reasonable, but according to the MPI-1 standard
(see page 40 for non-blocking send/recv, a more detailed explanation in
page 30):
"A nonblocking send call indicates that the system may start copying
data out of the send buffer. The sender should */not access*/ any part
of the send buffer after a nonblocking send operation is called, until
the send completes."
So before calling MPI_Wait to complete an isend operation, any
access to
the send buffer is illegal. It might be a little strict, but we have to
do what the standard says.
This have been changed in the new version of the MPI standard (2.1).
There is no restriction anymore regarding the read operations on the
buffers used for non-blocking sends.
Do you mean the next coming version of MPI standard? Because checking
again standard 2.1 , I didn't see any changes of those paragraphs. See
MPI Standard 2.1 (PDF version), page 52, and page 41.
Regards,
Shiqing
We should modify the memchecker accordingly.
george.
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