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Subject: Re: [OMPI devel] Padding on ompi_predefined_datatype_t running out
From: George Bosilca (bosilca_at_[hidden])
Date: 2014-01-13 16:16:56


The code is well protected against such issues. If one of our base structures become larger than corresponding predefined structure, the compiler should trigger an error similar to:

In file included from ../../../ompi/ompi/datatype/ompi_datatype_create_contiguous.c:23:0:
../../../ompi/ompi/datatype/ompi_datatype.h:105:10: error: size of array 'padding' is too large
     char padding[PREDEFINED_DATATYPE_PAD - sizeof(ompi_datatype_t)];
          ^

This is the case for all types that have a predefined enveloppe. Thus, the commit 30268 was unnecessary as the check was already included in the compilation by the inclusion of the ompi_debugger_canary.c.

  George.

On Jan 13, 2014, at 17:10 , Jeff Squyres (jsquyres) <jsquyres_at_[hidden]> wrote:

> I noticed the following this morning:
>
> * sizeof(ompi_predefined_datatype_t): 512
> * sizeof(ompi_datatype_t): 488
> * padding left: 24
>
> Do we need to increase the size of padding for predefined communicators for v1.9?
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
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