Hello Alexander,

Generally, some sentences start with lower case letters that should be capitalized. yes, I fixed some but will re-read it later this week.

Page 3, top. We probably should not explain here how to ensure progress for nonblocking ops. This matter should be covered by the general progress description elsewhere. I agree, I deleted it (it's already in the nonblocking point-to-point chapter).

Page 3, lower half. Look how progress is defined in this list by referring to the pt2pt progress rules. what do you mean with that? I would just reference the current MPI definition - NBCs seem to fit this model nicely.

Ibid. There are already 3 classes of requests: pt2pt, generalized, and file I/O ones. yes

Page 3, bottom. How many nonblocking ops can overlap with a blocking one? I.e., can one have the following situation:

Process 0 Process 1

MPI_Ibarrier(req) MPI_Ibarrier(req) MPI_Wait(req) MPI Bcast MPI_Bcast MPI_Wait(req) yes, this is a legal code and should work. Any objections?

Page 5, bottom. 32767 simultaneous ops to support is a tall order. I'd say, 1 (one) would be a good lower limit, thus allowing no overlap. Or even 0 (zero), meaning no nonblocking collective support at all. The rest of this passage would probably be better reformulated as an advice to implementors. yes it is - I'm very indicisive. We have to discuss this at the Forum in Chicago.

In the margin: editing a PDF requires creativity (exemplified by the earlier comments) or a pretty expensive Acrobat. Maybe we can find some other way of distributing and commenting on our drafts? oh yes, I fully agree. But the final document should be in MPI style, so I thought I should start with LaTeX. Do you have any suggestions? Wiki seems suboptimal because we would have to re-format everything (which might be not too bad). LaTeX source in svn would be the best, but does everybody have LaTeX? I'm open for any suggestion!

For now, I uploaded the changed version to the wikipage (to avoid attachments on the mailinglist): https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/NBColl Thanks for the comments! Best, Torsten -- bash$ :(){ :|:&};: --------------------- http://www.unixer.de/ ----- Torsten Hoefler | Postdoctoral Researcher Open Systems Lab | Indiana University 150 S. Woodlawn Ave. | Bloomington, IN, 474045, USA Lindley Hall Room 135 | +01 (812) 855-3608