OpenCV Debug

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Debug OpenCV

• 一些预设的环境变量 OpenCV environment variables reference
• OpenCV Tracing: 默认编译到 OpenCV lib 中
  • export OPENCV_TRACE=1
• ITT for Vtune
• Vtune 查看 CallStack

Tracing

• export OPENCV_TRACE=1
  • set OPENCV_TRACE=1 for Windows
• Run your App to generate the OpenCVTrace.txt
• Run trace_profiler.py to generate the summary
• export OPENCV_TRACE_DEPTH_OPENCV=0 可以不限制跟踪深度

使用 OPENCV_TRACE/OPENCV_TRACE_DEPTH_OPENCV 跟踪会增加执行时间，performance 测试时不要使用

name	type	default	description
⭐ OPENCV_TRACE	bool	false	enable trace
OPENCV_TRACE_LOCATION	string	OpenCVTrace	trace file name ("${name}-$03d.txt")
OPENCV_TRACE_DEPTH_OPENCV	num	1	0 不限制跟踪深度，1不跟踪细节，只有 API
OPENCV_TRACE_MAX_CHILDREN_OPENCV	num	1000	限制 OpenCV API 调用的跟踪
OPENCV_TRACE_MAX_CHILDREN	num	1000	跟踪子节点，避免大循环
OPENCV_TRACE_SYNC_OPENCL	bool	false	wait for OpenCL kernels to finish

Example

``` export OPENCV_TRACE=1 ``` ``` ID name count thr min max median avg *self* IPP % OpenCL % t-min t-max t-median t-avg total t-IPP % t-OpenCL % 1 cv::imwrite#loadsave.cpp:785 10 1 128.516 444.347 281.262 288.623 2886.230 0.000 0 0.000 0 128.516 444.347 281.262 288.623 2886.230 0.000 0 0.000 0 2 cv::absdiff#arithm.cpp:931 200 1 3.988 30.363 13.851 10.810 2161.989 0.000 0 0.000 0 3.988 30.363 13.851 10.810 2161.989 0.000 0 0.000 0 3 cv::imread#loadsave.cpp:630 4 1 50.158 229.217 123.496 131.592 526.367 0.000 0 0.000 0 50.158 229.217 123.496 131.592 526.367 0.000 0 0.000 0 4 cv::Mat::copyTo#copy.cpp:307 4 1 11.238 33.255 22.259 22.253 89.010 88.708 99 0.000 0 11.238 33.255 22.259 22.253 89.010 88.708 99 0.000 0 5 cv::utils::logging::LogTagManager::assign#logtagmanager.cpp:72 1 1 0.049 0.049 0.049 0.049 0.049 0.000 0 0.000 0 0.049 0.049 0.049 0.049 0.049 0.000 0 0.000 0 6 cv::ocl::setUseOpenCL#ocl.cpp:1234 1 1 0.014 0.014 0.014 0.014 0.014 0.000 0 0.000 0 0.014 0.014 0.014 0.014 0.014 0.000 0 0.000 0 7 cv::utils::logging::LogTagManager::get#logtagmanager.cpp:104 1 1 0.003 0.003 0.003 0.003 0.003 0.000 0 0.000 0 0.003 0.003 0.003 0.003 0.003 0.000 0 0.000 0 ``` ``` export OPENCV_TRACE=1 export OPENCV_TRACE_DEPTH_OPENCV=0 ``` ``` ID name count thr min max median avg *self* IPP % OpenCL % t-min t-max t-median t-avg total t-IPP % t-OpenCL % 1 cv::imwrite#loadsave.cpp:785 10 1 128.875 445.248 281.637 287.970 2879.696 0.000 0 0.000 0 128.875 445.248 281.637 287.970 2879.696 0.000 0 0.000 0 2 cv::hal::absdiff8u#arithm.simd.hpp:547|cv::absdiff 200 1 3.996 42.662 13.642 10.894 2178.898 0.000 0 0.000 0 3.996 42.662 13.642 10.894 2178.898 0.000 0 0.000 0 3 cv::imread#loadsave.cpp:630 4 1 50.247 230.819 124.025 132.279 529.117 0.000 0 0.000 0 50.247 230.819 124.025 132.279 529.117 0.000 0 0.000 0 4 IPP:ippicviCopy_8u_C1R_L#copy.cpp:364|cv::Mat::copyTo 4 1 10.751 33.440 22.274 22.185 88.740 88.740 100 0.000 0 10.751 33.440 22.274 22.185 88.740 88.740 100 0.000 0 5 cv::absdiff#arithm.cpp:931 200 1 0.003 0.228 0.005 0.007 1.434 0.000 0 0.000 0 4.001 42.764 13.758 10.902 2180.332 0.000 0 0.000 0 6 cv::Mat::copyTo#copy.cpp:307 4 1 0.052 0.124 0.069 0.079 0.315 0.000 0 0.000 0 10.875 33.510 22.335 22.264 89.054 88.740 99 0.000 0 7 cv::utils::logging::LogTagManager::assign#logtagmanager.cpp:72 1 1 0.057 0.057 0.057 0.057 0.057 0.000 0 0.000 0 0.057 0.057 0.057 0.057 0.057 0.000 0 0.000 0 8 cv::ocl::setUseOpenCL#ocl.cpp:1234 1 1 0.013 0.013 0.013 0.013 0.013 0.000 0 0.000 0 0.016 0.016 0.016 0.016 0.016 0.000 0 0.000 0 9 cv::utils::logging::LogTagManager::get#logtagmanager.cpp:104 1 1 0.003 0.003 0.003 0.003 0.003 0.000 0 0.000 0 0.003 0.003 0.003 0.003 0.003 0.000 0 0.000 0 10 cv::ocl::OpenCLExecutionContext::getCurrentRef#ocl.cpp:1086|cv::ocl... 1 1 0.002 0.002 0.002 0.002 0.002 0.000 0 0.000 0 0.002 0.002 0.002 0.002 0.002 0.000 0 0.000 0 ```

ITT

name	type	default	description
OPENCV_TRACE_ITT_ENABLE	bool	true
OPENCV_TRACE_ITT_PARENT	bool	false	set parentID for ITT task
OPENCV_TRACE_ITT_SET_THREAD_NAME	bool	false	set name for OpenCV's threads "OpenCVThread-%03d"

Reference

• OpenCV environment variables reference