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

[Boisvert, Sebastien]

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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