[mpiwg-tools] ticket 405: MPI_CHAR as string

[Mohror, Kathryn]

Thanks for the feedback. I have attached a new draft for this ticket and incorporated your changes. Please give me any additional comments by the start of business Monday.

Kathryn

On Feb 14, 2014, at 7:23 AM, Dave Goodell (dgoodell) <dgoodell at cisco.com<mailto:dgoodell at cisco.com>> wrote:

+1 to almost everything that Jeff said.  My only quibble would be to change the last sentence in his text from:

The contents of returned MPI_CHAR values are only defined from index 0 through the location of the first null-terminating character.

To:

The contents of returned MPI_CHAR ***arrays*** are only defined from index 0 through the location of the first null-terminating character.

-Dave

On Feb 14, 2014, at 7:27 AM, Jeff Squyres (jsquyres) <jsquyres at cisco.com<mailto:jsquyres at cisco.com>> wrote:

Here's the new text:

-----
The use of the datatype MPI_CHAR in the MPI tool information interface implies a null-terminated character array, i.e. a string in the C language. If a variable has type MPI_CHAR, the value of the count parameter returned by MPI_T_CVAR_HANDLE_ALLOC and MPI_T_PVAR_HANDLE_ALLOC will include the null-terminating character. The value returned in count must be large enough to contain any valid value for the given variable. Arrays of type MPI_CHAR are only valid to the first null character.
-----

There's a missing "," after "i.e." -- it should be "i.e.,"

I'd make some other minor changes:

The use of the datatype MPI_CHAR in the MPI tool information interface implies a null-terminated character array, i.e., a string in the C language. If a variable has type MPI_CHAR, the value of the count parameter returned by MPI_T_CVAR_HANDLE_ALLOC and MPI_T_PVAR_HANDLE_ALLOC ***must be large enough to include any valid value, including its null-terminating character.***  ***The contents of returned MPI_CHAR values are only defined from index 0 through the location of the first null-terminating character.***





On Feb 13, 2014, at 3:24 PM, Kathryn Mohror <kathryn at llnl.gov<mailto:kathryn at llnl.gov>> wrote:

Hi all,

Please have a look at this since we  have to decide if it's ready for a reading, and submit it to the forum for review on Monday if we do.

Kathryn

On Feb 7, 2014, at 1:05 PM, "Mohror, Kathryn" <mohror1 at llnl.gov<mailto:mohror1 at llnl.gov>> wrote:

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<mailto: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<mailto:kathryn at llnl.gov>, http://scalability.llnl.gov/
Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA, USA








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--
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_________________________________________________________________
Kathryn Mohror, kathryn at llnl.gov<mailto:kathryn at llnl.gov>, http://scalability.llnl.gov/
Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA, USA








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