====== OpenMP ======
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{{indexmenu>Programming:OpenMP}}


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===Actually in use===

 * OpenMP v3.1 (Feb. 2011) implemented in GCC 4.7 (Aug. 2011)
 * OpenMP v3.0 (May 2008) implemented in GCC 4.4 (June 2008)
 * OpenMP v2.5 implemented in GCC 4.2 (March 2006) 

Future versions

* OpenMP v4.0 (Oct. 2013) implemented in GCC 4.9rc 

===== Requirements =====

Ubuntu
12.04 GCC 4.6 with OpenMP v3.0 - necessary Package libgomp1

Examples and Tutorials for GCC

OpenMP Wiki
<code C>const int N = 1000000; 
double A[N], B[N], C[N]; /* Initialisierung von A, B und C */ 

#pragma omp parallel for 
for (int i = 0; i < N; i++) {
     A[i] = B[i] + C[i]; 
}</code>


==== Optimization ====

[[tools:optimization:openmp | Optimize]] the environment for your OpenMP code.

===OpenMP 4.0 and OpenACC offloading support in GCC ===

GCC 5.0 with libgomp 

[[https://gcc.gnu.org/wiki/Offloading | Manual]]


OpenMP 4.0 with OpenACC only works for NVIDIA NVPTX and Intel Xeon Phi targets