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@ -198,12 +198,12 @@ If threads == 0, OpenCV will disable threading optimizations and run all it's fu |
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sequentially. Passing threads \< 0 will reset threads number to system default. This function must |
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be called outside of parallel region. |
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OpenCV will try to run it's functions with specified threads number, but some behaviour differs from |
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OpenCV will try to run its functions with specified threads number, but some behaviour differs from |
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framework: |
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- `TBB` - User-defined parallel constructions will run with the same threads number, if |
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another does not specified. If later on user creates own scheduler, OpenCV will use it. |
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another is not specified. If later on user creates his own scheduler, OpenCV will use it. |
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- `OpenMP` - No special defined behaviour. |
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- `Concurrency` - If threads == 1, OpenCV will disable threading optimizations and run it's |
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- `Concurrency` - If threads == 1, OpenCV will disable threading optimizations and run its |
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functions sequentially. |
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- `GCD` - Supports only values \<= 0. |
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- `C=` - No special defined behaviour. |
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@ -233,7 +233,7 @@ CV_EXPORTS_W int getNumThreads(); |
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/** @brief Returns the index of the currently executed thread within the current parallel region. Always
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returns 0 if called outside of parallel region. |
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The exact meaning of return value depends on the threading framework used by OpenCV library: |
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The exact meaning of the return value depends on the threading framework used by OpenCV library: |
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- `TBB` - Unsupported with current 4.1 TBB release. Maybe will be supported in future. |
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- `OpenMP` - The thread number, within the current team, of the calling thread. |
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- `Concurrency` - An ID for the virtual processor that the current context is executing on (0 |
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@ -285,6 +285,19 @@ tm.start(); |
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tm.stop(); |
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std::cout << tm.getTimeSec(); |
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@endcode |
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It is also possible to compute the average time over multiple runs: |
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@code |
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TickMeter tm; |
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for (int i = 0; i < 100; i++) |
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{ |
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tm.start(); |
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// do something ...
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tm.stop(); |
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} |
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double average_time = tm.getTimeSec() / tm.getCounter(); |
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std::cout << "Average time in second per iteration is: " << average_time << std::endl; |
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@endcode |
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@sa getTickCount, getTickFrequency |
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*/ |
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@ -428,12 +441,13 @@ The function returns the aligned pointer of the same type as the input pointer: |
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*/ |
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template<typename _Tp> static inline _Tp* alignPtr(_Tp* ptr, int n=(int)sizeof(_Tp)) |
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{ |
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CV_DbgAssert((n & (n - 1)) == 0); // n is a power of 2
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return (_Tp*)(((size_t)ptr + n-1) & -n); |
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} |
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/** @brief Aligns a buffer size to the specified number of bytes.
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The function returns the minimum number that is greater or equal to sz and is divisible by n : |
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The function returns the minimum number that is greater than or equal to sz and is divisible by n : |
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\f[\texttt{(sz + n-1) & -n}\f] |
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@param sz Buffer size to align. |
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@param n Alignment size that must be a power of two. |
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@ -482,7 +496,7 @@ The function returns true if the optimized code is enabled. Otherwise, it return |
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*/ |
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CV_EXPORTS_W bool useOptimized(); |
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static inline size_t getElemSize(int type) { return CV_ELEM_SIZE(type); } |
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static inline size_t getElemSize(int type) { return (size_t)CV_ELEM_SIZE(type); } |
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/////////////////////////////// Parallel Primitives //////////////////////////////////
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@ -526,10 +540,10 @@ template<typename _Tp, typename Functor> inline |
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void Mat::forEach_impl(const Functor& operation) { |
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if (false) { |
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operation(*reinterpret_cast<_Tp*>(0), reinterpret_cast<int*>(0)); |
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// If your compiler fail in this line.
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// If your compiler fails in this line.
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// Please check that your functor signature is
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// (_Tp&, const int*) <- multidimential
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// or (_Tp&, void*) <- in case of you don't need current idx.
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// (_Tp&, const int*) <- multi-dimensional
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// or (_Tp&, void*) <- in case you don't need current idx.
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} |
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CV_Assert(this->total() / this->size[this->dims - 1] <= INT_MAX); |
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KUANG Fangjun
8 years ago