[mvapich-discuss] MPI_BCAST() message max size

[Lu Qiyue]

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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.cse.ohio-state.edu/pipermail/mvapich-discuss/attachments/20130716/ba4bb758/attachment-0001.html