(Sorry about the top-post, outlook web mail sucks) But we should do so carefully. That sentence is also the sentence that prohibits passive target and active target (or either of the active targets) from conflicting. Which is actually how I had read that, but I can see Rajeev's interpretation as well. Brian -- Brian W. Barrett Scalable System Software Group Sandia National Laboratories ________________________________________ From: [email protected] [[email protected]] on behalf of Torsten Hoefler [[email protected]] Sent: Monday, August 19, 2013 8:01 PM To: MPI 3.0 Remote Memory Access working group Subject: [EXTERNAL] Re: [Mpi3-rma] nested locks 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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