[mvapich-discuss] MPI_BCAST() message max size

[Devendar Bureddy]

1.7RC2 is very old release. we have fixed many integer overflow issues in
later releases to handle >2GB buffer size. Can you please try with our
latest release version(1.9).

I tried 2^31 (count) * 8 (real) = (8GB) with our latest release(1.9) and it
worked fine.

-Devendar






On Tue, Jul 16, 2013 at 10:36 AM, Lu Qiyue <luqiyue at gmail.com> wrote:

> Thanks for your response, Bureddy, mvapich2 version is 1.7 RC1. Sorry for
> the configuration, I am not clear yet, need to talk someone else.
> I am working on a sharable code, if possible, will email to you.
> So you made buffer size up to 1GB? But in my case, it is up to 6.3 GB. Is
> there possible a limit between them exists? Could you please make a further
> test that up to 7GB?
>
> In the manual of version 1.7 RC2, parameter 11.62 said:
> 11.62
> MV2_SHMEM_COLL_MAX_MSG_SIZE
> • Class: Run Time
> • Applicable interface(s): OFA-IB-CH3, OFA-iWARP-CH3
> This parameter can be used to select the max buffer size of message for
> shared memory collectives.
>
> Is this the limit we are looking for?  Thanks
>
> Qiyue Lu
>
>
> On Tue, Jul 16, 2013 at 9:06 AM, Devendar Bureddy <
> bureddy at cse.ohio-state.edu> wrote:
>
>> Hi Qiyue Lu
>>
>> MVAPICH2 should handle this scenario. I just tried simple 1GB count * 8
>> bytes and it worked for me. Can you provide more details on your
>> configuration and mvapich2 version details?  Is it possible to share your
>> reproducer program?
>>
>> -Devendar
>>
>>
>> On Tue, Jul 16, 2013 at 1:27 AM, Lu Qiyue <luqiyue at gmail.com> wrote:
>>
>>> Dear All:
>>>
>>> When I am using MPI_BCAST(buffer, count, datatype, root, comm) to
>>> broadcast a very large data stored in buffer, a Seg error occurs.
>>>
>>> if assume I have enough memory, I am wondering, is there any maximum
>>> limit on buffer size? In my case, count* 8 bytes (double precision
>>> datatype) goes up to 6 GB. Can this be allowed in mvapich2?
>>>
>>> Thanks
>>>
>>> Qiyue Lu
>>>
>>> _______________________________________________
>>> mvapich-discuss mailing list
>>> mvapich-discuss at cse.ohio-state.edu
>>> http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>>>
>>>
>>
>>
>> --
>> Devendar
>>
>
>


-- 
Devendar
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.cse.ohio-state.edu/pipermail/mvapich-discuss/attachments/20130716/57fa2d88/attachment.html