[mpich-discuss] What is the difference between MPI_THREAD_SINGLE and MPI_THREAD_FUNNELED

Fri May 30 12:30:12 CDT 2014

On Friday, May 30, 2014 12:26 PM, discuss-bounces at mpich.org [discuss-bounces at mpich.org] on behalf of Rajeev Thakur [thakur at mcs.anl.gov] wrote:
> To: discuss at mpich.org
> Subject: Re: [mpich-discuss] What is the        difference      between MPI_THREAD_SINGLE and MPI_THREAD_FUNNELED
> 
> It shouldn't, but what does it return in your program?

I am currently using MPI_Init (I thought it was OK if only the main thread calls MPI functions).

Code-> https://github.com/GeneAssembly/biosal/blob/master/engine/node.c#L33

> 
> Rajeev
> 
> On May 30, 2014, at 11:33 AM, "Boisvert, Sebastien" <boisvert at anl.gov> wrote:
> 
>>
>> On Friday, May 30, 2014 11:22 AM, discuss-bounces at mpich.org [discuss-bounces at mpich.org] on behalf of Rajeev Thakur [thakur at mcs.anl.gov] wrote:
>>> To: discuss at mpich.org
>>> Subject: Re: [mpich-discuss] What is the difference between     MPI_THREAD_SINGLE and MPI_THREAD_FUNNELED
>>>
>>> You should use MPI_THREAD_FUNNELED. MPI_THREAD_SINGLE should be used if your program has one thread total.
>>
>> Is it possible with MPICH that
>> MPI_Init_thread(&argc, &argv, MPI_THREAD_FUNNELED, &provided)
>> sets provided to MPI_THREAD_SINGLE ?
>>
>>
>> Thanks
>>
>>>
>>> Rajeev
>>>
>>>
>>> On May 30, 2014, at 10:49 AM, "Boisvert, Sebastien" <boisvert at anl.gov> wrote:
>>>
>>>> Hi MPICH community:
>>>>
>>>> With MPICH, if my MPI process has 10 threads (including the main thread) and only the main thread
>>>> calls MPI functions, do I need to use MPI_THREAD_SINGLE or MPI_THREAD_FUNNELED
>>>> when I invoke MPI_Init_thread ?
>>>>
>>>> Thanks a ton !
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