[Developers] MPI_Finalize

[Erik Schnetter]

No, that's not possible.  MPI_Init has to be called before command  
line arguments are passed, which has to happen before the parameter  
file is read, which has to happen before the driver is known.

-erik

On Oct 2, 2007, at 12:09:32, Jian Tao wrote:

> Just curious, could MPI_Init be pushed in the driver instead ?
>
> Regards,
> Jian
>
> Erik Schnetter wrote:
>> Currently, the flesh calls MPI_Init, but the driver is supposed to  
>> call
>> MPI_Finalize.  This happens presumably in the terminate bin as
>> Driver_Terminate.  According to the MPI standard, no externally  
>> visible
>> operations may be performed after that, so that the driver may as  
>> well
>> call exit at the same time.  If not, strange errors can happen, as
>> reported today elsewhere by Luca Baiotti.
>>
>> I propose to have the flesh call MPI_Finalize, to make things  
>> symmetric
>> to MPI_Init.  It would do so very late in CCTKi_ShutdownCactus after
>> printing "Done.".  This means that thorns could continue to schedule
>> actions in the terminate bin after Driver_Terminate, and in the  
>> shutdown
>> bin.
>>
>> I attach a diff.  Of course, PUGH and Carpet would also need to be
>> changed, so that they don't call MPI_Finalize any more.
>>
>> -erik
>>
>> --Erik Schnetter <schnetter at cct.lsu.edu>
>>
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
and signing email messages.  Get my PGP key from www.keyserver.net.



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