Starting OpenMP

parallelism_scemama.org

@@ -1525,7 +1525,7 @@ Result =  3.1415926535901777
    #+LATEX: \end{column}
    #+LATEX: \end{columns}
 
-* Multi-threading
+* Multi-threading                                                  :noesport:
 ** Processes /vs/ threads
 
 *** Process
@@ -1550,7 +1550,7 @@ Result =  3.1415926535901777
    - Concurrent programming
    - Graphical user interfaces (progress bars, ...)
    - Asynchronous I/O
-   - Standard library: POSIX threads (pthreads)
+   - Standard library: POSIX threads (=pthreads=)
    #+LATEX: \end{column}
    #+LATEX: \end{columns}
   
@@ -1676,6 +1676,23 @@ if __name__ == '__main__':
 
 * OpenMP
 
+** OpenMP
+   - OpenMP is an extension of programming languages that enable the use of
+     multi-threading to parallelize the code using directives.
+   - The OpenMP library may be implemented using =pthreads=
+   - Extensions in OpenMP5 to offload code execution to GPUs
+   - The same source code can be executed with/without OpenMP
+
+     #+begin_src fortran
+    !$OMP PARALLEL DEFAULT(SHARED) PRIVATE(i)
+    !$OMP DO
+    do i=1,n
+       A(i) = B(i) + C(i)
+    end do
+    !$OMP END DO
+    !$OMP END PARALLEL
+     #+end_src
+
 * Exercises