Re: [mpich-discuss] MPICH-3.1.4 with PAMID: Win_lock
Thanks. I vaguely remember that discussion but I was confused by the text until now. Jeff On Thu, Mar 30, 2017 at 7:57 PM, Balaji, Pavan <[email protected]> wrote:
MPI-2.2 page 347, line 31:
"Distinct access epochs for win at the same process must be disjoint."
We had a passionate discussion about this at the Forum for an entire day
many years ago, even though every single person agreed that this restriction was silly. Kind of hard to forget. Fun times. :-)
-- Pavan
On Mar 30, 2017, at 1:53 PM, Jeff Hammond <[email protected]>
wrote:
I cannot find the text in MPI 2.1 that says one cannot initiate a
shared lock at two processes at the same time. I have some vague recollection, but I read the chapter twice and couldn't find the restriction.
Jeff
On Thu, Mar 30, 2017 at 9:54 AM, Balaji, Pavan <[email protected]> wrote:
No, it's not a bug. PAMID only supports MPI-2.1. Before you do locks
to multiple targets, you need to check if MPI_VERSION >= 3. MPI-2 only supported locks to a single target. MPI-3 added multiple lock epochs.
Also, pamid is not supported anymore in MPICH. We recommend the
MPICH-3.3/OFI/BGQ path for Blue Gene.
-- Pavan
On Mar 30, 2017, at 10:12 AM, Jeff Hammond <[email protected]>
wrote:
I guess this is a bug but MPICH 3.1.x isn't the basis for the
supported MPI on BGQ, so I doubt you will get much traction by reporting it. IBM made an effort to support MPI-3 with PAMID but it was as an open-source, best effort project, and I recall there were some issues with it, including deadlock in certain asynchronous operations.
You should try the supported MPI-2.2 implementation on BGQ or try the
unsupported OFI-based implementation of MPI-3.
Disclaimer: The comments above are spoken in my capacity as the
person who used to support MPI at ALCF, not my current job role.
Best,
Jeff
On Thu, Mar 30, 2017 at 3:21 AM, Sebastian Rinke <
[email protected]> wrote:
Same window, i.e.:
Process 0:
Win_lock(MPI_LOCK_SHARED, target=A, window=win) Win_lock(MPI_LOCK_SHARED, target=B, window=win)
Sebastian
On 30 Mar 2017, at 06:24, Jeff Hammond <[email protected]> wrote:
Same window or different windows?
Jeff
On Wed, Mar 29, 2017 at 5:59 PM Sebastian Rinke < [email protected]> wrote: Dear all,
I have some issue with MPI_Win_lock in MPICH-3.1.4 on Blue Gene/Q.
Here is my example:
Process 0:
Win_lock(MPI_LOCK_SHARED, target=A) Win_lock(MPI_LOCK_SHARED, target=B)
No matter what I use for A and B (given A != B), a process cannot acquire more than one lock at a time.
To my understanding, it should be possible to acquire more than one lock.
Can you confirm this issue?
Thanks, Sebastian _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss -- Jeff Hammond [email protected] http://jeffhammond.github.io/ _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss
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Jeff Hammond