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.
>