[mpiwg-tools] ticket 405: MPI_CHAR as string

[Kathryn Mohror]

Hi Junchao,
> 
> PS: I find  MPI_CHAR variables are a little special.  For  MPI_INT like variables, we get their count from *_handle_alloc. When we write them, very likely we don't increase its count. But for MPI_CHAR variables, it is not the case. When you write them, you probably have a longer string to write! 

The count returned for MPI_CHAR variables is supposed to be long enough to contain the largest valid value of the variable. Does that address what you are thinking?

Kathryn

> 
> 
> 
> --Junchao Zhang
> 
> 
> On Sat, Feb 8, 2014 at 9:54 AM, Kathryn Mohror <kathryn at llnl.gov> wrote:
> Hi Junchao,
> 
> I'm not sure what you mean. MPI_CHAR is in the list of types allowed for variables in section 14.3.5.
> 
> Kathryn
> 
> On Feb 8, 2014, at 4:54 AM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:
> 
>> When to use MPI_CHAR? I don't find it in the text.
>> At least, for non-generic pvars, MPI_CHAR is not in the allowed types currently.
>> 
>> --Junchao Zhang
>> 
>> Hi all,
>> 
>> As we discussed in our call, I have drafted new text for ticket 405 which clarifies our intent for the MPI_CHAR datatype to represent strings in the tools interface. Please take a look at the red text for ticket 405 in the attached document and send your comments.
>> 
>> Kathryn
>> 
>> 
>> _________________________________________________________________
>> Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
>> Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA, USA
>> 
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> _________________________________________________________________
> Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
> Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA, USA
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_________________________________________________________________
Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA, USA








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