Brian makes a good point, and its a reminder that we need to look at everything with reference to the entire chapter. Bill William Gropp Director, Parallel Computing Institute Deputy Director for Research Institute for Advanced Computing Applications and Technologies Thomas M. Siebel Chair in Computer Science University of Illinois Urbana-Champaign On Aug 19, 2013, at 9:01 PM, Torsten Hoefler wrote:

Agreed -- I think it's a bug and we should fix it asap.

Best, Torsten

On Mon, Aug 19, 2013 at 03:47:39PM -0500, Rajeev Thakur wrote:

...

It is still disallowed in MPI-3 by this sentence

pg 437, ln 28: Distinct access epochs for win at the same process must be disjoint.

On Aug 19, 2013, at 3:13 PM, Jim Dinan wrote:

...

Jeff,

With apologies if I have misunderstood your question. To clarify, the example Rajeev gave was forbidden in MPI-2. One could not have concurrent passive target access epochs, even if they accessed different targets. It is allowed in MPI-3.

~Jim.

On Mon, Aug 19, 2013 at 3:52 PM, Jeff Hammond <[email protected]> wrote: you mean lock at those ranks, not by those ranks? those aren't conflicting so i don't see the issue. maybe i am a dolt though.

jeff

On Mon, Aug 19, 2013 at 2:44 PM, Rajeev Thakur <[email protected]> wrote: Did we make any change in MPI 3.0 to allow nesting of MPI_Win_lock calls? For example,

Win_lock(rank 1) Win_lock(rank 2)

Win_unlock(rank 2) Win_unlock(rank 1)

I can't find the text we added or deleted to allow this.

But I do see text that disallows this: pg 437, ln 28: "Distinct access epochs for win at the same process must be disjoint."

Rajeev

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