On 7/23/07, Jeff Squyres <jsquy...@cisco.com> wrote:
Does anyone have any opinions on this? If not, I'll go implement option #1.
Sorry, Jeff... just reading this. I think your option #1 is the better. However, I want to warn you about to issues: * In my Linux FC6 box, malloc(0) return different pointers for each call. In fact, I believe this is a requeriment for malloc, in the case of MPI_Alloc_mem, this could be relaxed, but it could cause problems (supose some code building a hash table using pointers as keys, or even a stl::map<void*, something>). Just a warn. * malloc(0) return an aligned pointer, here I really think MPI_Alloc_mem should return a pointer with the same aligment a malloc(1) would return. So I am not sure your global char[1] is OK. As reference, I can comment the approach used in Python memory allocator to assure portability across platforms. They always alloc at least 1 byte. This is not so important in an environment like Python, but perhaps this approach in wrong for an MPI implementation. Regards, -- Lisandro Dalcín --------------- Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC) Instituto de Desarrollo Tecnológico para la Industria Química (INTEC) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) PTLC - Güemes 3450, (3000) Santa Fe, Argentina Tel/Fax: +54-(0)342-451.1594
