Openmp In Dev C++
-->Causes the compiler to process #pragma omp directives in support of OpenMP.
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Syntax
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/openmp
Remarks
#pragma omp is used to specify Directives and Clauses. If /openmp isn't specified in a compilation, the compiler ignores OpenMP clauses and directives. OpenMP Function calls are processed by the compiler even if /openmp isn't specified.
The C++ compiler currently supports the OpenMP 2.0 standard. However, Visual Studio 2019 also now offers SIMD functionality. To use SIMD, compile by using the /openmp:experimental option. This option enables both the usual OpenMP features, and additional OpenMP SIMD features not available when using the /openmp switch.
Applications compiled by using both /openmp and /clr can only be run in a single application domain process. Multiple application domains aren't supported. That is, when the module constructor (.cctor) is run, it detects if the process is compiled using /openmp, and if the app is loaded into a non-default runtime. For more information, see appdomain, /clr (Common Language Runtime Compilation), and Initialization of Mixed Assemblies.
If you attempt to load an app compiled using both /openmp and /clr into a non-default application domain, a TypeInitializationException exception is thrown outside the debugger, and a OpenMPWithMultipleAppdomainsException exception is thrown in the debugger.
These exceptions can also be raised in the following situations:
If your application is compiled using /clr but not /openmp, and is loaded into a non-default application domain, where the process includes an app compiled using /openmp.
If you pass your /clr app to a utility, such as regasm.exe, which loads its target assemblies into a non-default application domain.
The common language runtime's code access security doesn't work in OpenMP regions. If you apply a CLR code access security attribute outside a parallel region, it won't be in effect in the parallel region.
Microsoft doesn't recommend that you write /openmp apps that allow partially trusted callers. Don't use AllowPartiallyTrustedCallersAttribute, or any CLR code access security attributes.
To set this compiler option in the Visual Studio development environment
Openmp Examples
Open the project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.
Expand the Configuration Properties > C/C++ > Language property page.
Modify the OpenMP Support property.
To set this compiler option programmatically
- See OpenMP.
Example
The following sample shows some of the effects of thread pool startup versus using the thread pool after it has started. Assuming an x64, single core, dual processor, the thread pool takes about 16 ms to start up. After that, there's little extra cost for the thread pool.
When you compile using /openmp, the second call to test2 never runs any longer than if you compile using /openmp-, as there's no thread pool startup. At a million iterations, the /openmp version is faster than the /openmp- version for the second call to test2. At 25 iterations, both /openmp- and /openmp versions register less than the clock granularity. Best auto tune plug in for studio one 3.
Openmp Compiler
If you have only one loop in your application and it runs in less than 15 ms (adjusted for the approximate overhead on your machine), /openmp may not be appropriate. If it's higher, you may want to consider using /openmp.
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See also
Openmp Code
MSVC Compiler Options
MSVC Compiler Command-Line Syntax
OpenMP in MSVC