MPI is designed to allow users to create programs that can run efficiently on most parallel architectures. The design process included vendors (such as IBM, Intel, TMC, Cray, Convex, etc.), parallel library authors (involved in the development of PVM, Linda, etc.), and applications specialists. There also exist other types like: MPIUNSIGNED, MPIUNSIGNEDLONG, and MPILONGDOUBLE. A common pattern of process interaction. A common pattern of interaction among parallel processes is for one, the master, to allocate work to a set of slave processes and collect results from the slaves to synthesize a final result.

Basics

This page will give you a general overview of how to compile and execute a program that has been parallelized with MPI. Many of the options listed below are the same for both Open MPI and Intel MPI, however, be careful and look up if they indeed behave the same way.

2How to Compile MPI Code
3How to Run an MPI Executable

How to Compile MPI Code

MPI is not a programming language, but rather a standard library that is used to send messages between multiple processes. These processes can be located on the same system (a single multi-core SMP system) or on a collection of distributed servers. Unlike OpenMP, the distributed nature of MPI allows it to work on almost any parallel environment.

Gravity falls season 2 download torrent pc. Before continuing, please make sure that the openmpi or intelmpi module is loaded (go here to see how to load/switch modules).

There are several so called MPI 'compiler wrappers', e.g. mpicc. These take care of including the correct MPI libraries for the programming language you are using. But they share most command line options. Depending on whether your code is written in C, C++ or Fortran, follow the instructions in one of the tables below. Make sure to replace the arguments inside <…> with specific values.

Open MPI

Use the following command to specify the program you would like to compile (replace <src_file> with a path to your code, e. g. ./myprog.c).

Language	Command
C	`$ mpicc <src_file> -o <name_of_executable>`
C++	`$ mpicxx <src_file> -o <name_of_executable>`
Fortran	`$ mpifort <src_file> -o <name_of_executable>`

You can also type the command $ mpicc [options], $ mpicxx [options] or $ mpifort [options]. There are a few options that come with Open MPI, however, options are more important for running your program. The compiler options might be useful to fetch more information about the Open MPI module you are using. Compile options unknown to the MPI compiler wrapper are simply forwarded to the underlying compiler e.g. icc.

Options	Function
-showme:help	print a short help message about the usage and lists all compiler options
-showme:version	show Open MPI version

Instead of typing the compiler wrapper mpicc, mpicxx or mpifort explicitly, on most systems (e.g. the RWTH Compute Cluster) there are environment variables defined, which you can use to call the MPI compiler in a more general manner. Simple use $MPICC, $MPICXX or $MPIFC for the compiler you want to use and let the module system handle the dirty details of using the appropriate command.

Intel MPI

The Intel MPI is shipped with two sets of compiler wrappers (for GCC and for Intel compilers); it is rather important to use the right ones. Especially when using any software building tolls like CMake, double-check carefully about the right compiler wrappers being actually used, otherwise you will call the wrong compilers internally.

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Use the following command to specify the program you would like to compile (replace <src_file> with a path to your code, e. g. ./myprog.c).

Compiler Driver	C	C++	Fortran
GCC	`$ mpicc <src_file> -o <name>`	`$ mpicpc <src_file> -o <name>`	`$ mpifort <src_file> -o <name>`
Intel	`$ mpiicc <src_file> -o <name>`	`$ mpiicpc <src_file> -o <name>`	`$ mpiifort <src_file> -o <name>`

You can also type the command $ mpicc [options] <src_file> -o <name> etc., where [options] can be replaced with one or more of the ones listed below. Intel MPI comes with rather advanced compiler options, that are mainly aimed at optimization and analyzing your code with the help of Intel tools.

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Options	Function
-g	enable debugging information
-OX	enable compiler optimization, where `X` represents the optimization level and is one of 0, 1, 2, 3
-v	print the compiler version

How to Run an MPI Executable

Ensure that the correct MPI module is loaded (go here to see how to load/switch modules). Once again, the command line options slightly differ between Intel MPI and Open MPI.In order to start any MPI program, type the following command where <executable> specifies the path to your application:

Note that mpiexec and mpirun are synonymous in Open MPI, in Intel MPI it's mpiexec.hydra and mpirun.

Don’t forget to put the -np or -n option as explained below. All the other options listed below are not mandatory.

Open MPI

Option	Function
-np <num_procs> or -n <num_procs>	number of processes to run
-npersocket <num_procs>	number of processes per socket
-npernode <num_procs>	number of processes per node
-wdir <directory>	change to directory specified before executing the program
-path <path>

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