[Mpi3-rma] Fwd: [Mpi-comments] Freeing memory allocated in MPI_WIN_ALLOCATE_SHARED

Wed Sep 5 11:07:52 CDT 2012

This is fine for me.

Hubert
________________________________________
From: mpi3-rma-bounces at lists.mpi-forum.org [mpi3-rma-bounces at lists.mpi-forum.org] on behalf of William Gropp [wgropp at illinois.edu]
Sent: Wednesday, September 05, 2012 5:47 PM
To: MPI 3.0 Remote Memory Access working group
Subject: Re: [Mpi3-rma] Fwd: [Mpi-comments] Freeing memory allocated in MPI_WIN_ALLOCATE_SHARED

Torsten has pointed out that this approach has the fragile list problem, and I agree.  A better option might be:

Include this information on the affected window create routines (MPI_WIN_ALLOCATE and MPI_WIN_ALLOCATE_SHARED).

Add to MPI_WIN_FREE that any memory allocated by a window creating routine is freed, without listing the affected routines.

Comments?

Bill

William Gropp
Director, Parallel Computing Institute
Deputy Director for Research
Institute for Advanced Computing Applications and Technologies
Paul and Cynthia Saylor Professor of Computer Science
University of Illinois Urbana-Champaign

On Sep 5, 2012, at 4:11 PM, Jim Dinan wrote:

> We could also shorten it to:
>
> If the window was created with \mpifunc{MPI\_WIN\_ALLOCATE} or \mpifunc{MPI\_WIN\_ALLOCATE\_SHARED}, \mpifunc{MPI\_WIN\_FREE} will free the window memory that was allocated during window creation.
>
> ~Jim.
>
> On 9/5/12 8:38 AM, Rajeev Thakur wrote:
>> Another option is to just add an "or \mpifunc{MPI\_WIN\_ALLOCATE\_SHARED}" to the first sentence, as below, but either version is fine with me.
>>
>> If the window was created with \mpifunc{MPI\_WIN\_ALLOCATE} or \mpifunc{MPI\_WIN\_ALLOCATE\_SHARED},
>> \mpifunc{MPI\_WIN\_FREE} will free the window memory that was allocated in \mpifunc{MPI\_WIN\_ALLOCATE} or \mpifunc{MPI\_WIN\_ALLOCATE\_SHARED}.
>>
>>
>> On Sep 5, 2012, at 2:50 AM, William Gropp wrote:
>>
>>> Here's the current text (p 415 line 6):
>>>
>>> If the
>>> window was created with \mpifunc{MPI\_WIN\_ALLOCATE},
>>> \mpifunc{MPI\_WIN\_FREE} will free the window memory that was allocated
>>> in \mpifunc{MPI\_WIN\_ALLOCATE}.}
>>>
>>> Here is my proposed correction
>>>
>>> (above text, followed by)
>>>
>>> If the window was created with \mpifunc{MPI\_WIN\_ALLOCATE\_SHARED},
>>> \mpifunc{MPI\_WIN\_FREE} will free the window memory that was allocated
>>> in \mpifunc{MPI\_WIN\_ALLOCATE\_SHARED}.
>>>
>>> This is a sufficient change, since the document is a standard and we don't need to state the same behavior everywhere (note that MPI_WIN_ALLOCATE doesn't mention MPI_WIN_FREE in the description of MPI_WIN_ALLOCATE).
>>>
>>> Thoughts?  Is this a "simple oversight" error that we can add?
>>>
>>> Bill
>>>
>>>
>>> William Gropp
>>> Director, Parallel Computing Institute
>>> Deputy Director for Research
>>> Institute for Advanced Computing Applications and Technologies
>>> Paul and Cynthia Saylor Professor of Computer Science
>>> University of Illinois Urbana-Champaign
>>>
>>>
>>>
>>> On Sep 5, 2012, at 12:39 AM, Jeff Hammond wrote:
>>>
>>>> Okay, I thought it might do that but despite having a paper copy of
>>>> the MPI-3 RMA chapter three feet from me at the time, I was too lazy
>>>> to look it up.
>>>>
>>>> Thanks for the clarification.
>>>>
>>>> Jeff
>>>>
>>>> On Tue, Sep 4, 2012 at 11:47 PM, Jim Dinan <dinan at mcs.anl.gov> wrote:
>>>>> MPI_Win_free also frees memory allocated by MPI_Win_allocate.
>>>>>
>>>>> ~Jim.
>>>>>
>>>>>
>>>>> On 9/4/12 4:22 PM, Jeff Hammond wrote:
>>>>>>
>>>>>> Shouldn't that be a new call (MPI_Win_free_shared) to keep the usage
>>>>>> of MPI_Win_free uniform?  MPI_Win_free doesn't deallocate the buffers
>>>>>> in any other situation, does it?
>>>>>>
>>>>>> Jeff
>>>>>>
>>>>>> On Tue, Sep 4, 2012 at 4:07 PM, Jim Dinan <dinan at mcs.anl.gov> wrote:
>>>>>>>
>>>>>>> Hi All,
>>>>>>>
>>>>>>> It looks like we forgot to include the text specifying that
>>>>>>> MPI_Win_allocate_shared memory is freed along with the window.
>>>>>>>
>>>>>>> ~Jim.
>>>>>>>
>>>>>>>
>>>>>>> -------- Original Message --------
>>>>>>> Subject:        [Mpi-comments] Freeing memory allocated in
>>>>>>> MPI_WIN_ALLOCATE_SHARED
>>>>>>> Date:   Tue, 4 Sep 2012 12:49:10 +0000
>>>>>>> From:   Hubert Ritzdorf <Hubert.Ritzdorf at emea.nec.com>
>>>>>>> Reply-To:       Comments on the MPI Standard
>>>>>>> <mpi-comments at lists.mpi-forum.org>
>>>>>>> To:     mpi-comments at lists.mpi-forum.org
>>>>>>> <mpi-comments at lists.mpi-forum.org>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> is it correct that MPI_Win_free should free the memory allocated in
>>>>>>> MPI_Win_allocate_shared ?
>>>>>>>
>>>>>>> MPI_Win_free (Page 416, Line 5-6) specifies this only for
>>>>>>> memory allocated by MPI_Win_allocate.
>>>>>>> I think that an additional reference to MPI_Win_allocate_shared is
>>>>>>> missing also on Page 420, Line 31, Page 448 Line 25, Page 609 Line 31,
>>>>>>> Page 613 Line 1, Page 614 Line 9, Page 614 Line 31.
>>>>>>>
>>>>>>> Hubert
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> mpi3-rma mailing list
>>>>>>> mpi3-rma at lists.mpi-forum.org
>>>>>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
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>>>>
>>>>
>>>>
>>>> --
>>>> Jeff Hammond
>>>> Argonne Leadership Computing Facility
>>>> University of Chicago Computation Institute
>>>> jhammond at alcf.anl.gov / (630) 252-5381
>>>> http://www.linkedin.com/in/jeffhammond
>>>> https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond
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