MPI programming in postgreSQL backend source code

do you have more documentation about OPENMP and PostgreSQL?

El 09-11-2011 20:12, Greg Smith escribió:
>  On 11/09/2011 04:10 PM, Rudyar Cortés wrote:
>>  I'm a new programmer in postgreSQL source code..
>>  Is possible use MPI functions in postgreSQL source code?
>
>  To do this the proper way, you would need to modify the database's
>  "configure" step to:
>
>  -Check if the OpenMPI libraries are available and include the
>  necessary bits.  For example, this is in one of the projects I work on:
>
>  #ifdef _OPENMP
>  extern int omp_get_num_threads();
>  #endif
>
>  Some form of that test and defining the functions available would be
>  needed for what you want.
>
>  -Link OpenMPI in.  At the gcc level you'll need "-fopenmp" to start.
>
>  Then you could start using OpenMPI functions in database code.  You
>  might hack the build steps to do this in a simpler way, too, rather
>  than fight with configure the proper way.
>
>  Since a lot of the MPI functions aim at specific types of thread use
>  and I/O, it would be a major effort to utilize the library for too
>  many things.  The existing notion of how processes are created and
>  managed is scattered throughout the PostgreSQL code.  And the I/O
>  parts of the database are buried through a few layers of indirection.
>