[mpiwg-persistence] [mpi-forum/mpi-standard] Persistent collectives 2017 (#29)

[Anthony Skjellum]

Can this be a "ticket 0" change?

On Wed, Nov 29, 2017 at 2:56 PM, Martin Schulz <gu58niw at mytum.de> wrote:

> Hi Dan, all,
>
> Just my personal view: the that’s how I always interpreted the statement
> anyway, but I can see how this could be misinterpreted. Hence, adding the
> clarification is IMHO a good move.
>
> Just my 2c,
>
> Martin
>
>
> On 29. Nov 2017, at 11:07, HOLMES Daniel <d.holmes at epcc.ed.ac.uk> wrote:
>
> Hi Persistence WG members,
>
> We have a suggested change to the wording of the MPI Standard text that we
> will propose to the MPI Forum next week regarding persistent collective
> operations.
>
> Once initialized,
> persistent collective operations can be started in any order
> independently of initialization order
> +and the order can differ among ranks in the communicator
>
>
> Most of this sentence already appears in our proposed text - the
> suggestion is to add the line beginning with “+”.
>
> I think this is a good suggestion - we should make this point absolutely
> clear. We should word-smith the exact phrase (e.g. during the meeting later
> today?) and then include it in our formal reading next week by holding a
> “no-no” vote.
>
> Cheers,
> Dan.
>
> Begin forwarded message:
>
> *From: *KAWASHIMA Takahiro <notifications at github.com>
> *Subject: **Re: [mpi-forum/mpi-standard] Persistent collectives 2017
> (#29)*
> *Date: *29 November 2017 at 06:09:20 GMT
> *To: *mpi-forum/mpi-standard <mpi-standard at noreply.github.com>
> *Cc: *Dan Holmes <dholmes at epcc.ed.ac.uk>, Mention <
> mention at noreply.github.com>
> *Reply-To: *mpi-forum/mpi-standard <reply+00c7fc4ac57b95d8d1ec9f08428087
> 76a6bf83a41aa2b15e92cf000000011636110f92a169ce0dd58755 at reply.github.com>
>
> @dholmes-epcc-ed-ac-uk <https://github.com/dholmes-epcc-ed-ac-uk>,
> With the existing text, I think many people can understand that it is
> saying (at least) "*requests can be started using MPI_START or
> MPI_STARTALL in any order independently of initialization order*",
> because of analogy to the point-to-point communication. So I think your
> suggested text is unnecessary.
> But some people may *not* understand that it is also saying "*the order
> of starting requests can differ among ranks in the communicator*",
> because (1) the matching rule for persistent collective operations is
> different from the matching rule for point-to-point communication so that
> analogy to the point-to-point communication is not applied and (2) the
> order of nonblocking collective calls must be same among ranks in the
> communicator.
>
> How about the sentence below? I'm not good at English. Please correct it
> if it is not good.
>
> Once initialized,
> persistent collective operations can be started in any order
> independently of initialization order
> and the order can differ among ranks in the communicator
>
> If anyone else thinks the existing text is sufficient, I won't request the
> change. Probably my English reading skill is low.
>
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-- 
Anthony Skjellum, PhD
skjellum at gmail.com
Cell: +1-205-807-4968
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