When choosing a sampling rate, mind other timer-driven activities that may be scheduled in your system. If required, you can change the profiler's sampling frequency in Settings | Build, Execution, Deployment | Dynamic Analysis Tools | Perf (or DTrace). The default sampling rate value is rather high, which might require a lot of disk space for long-running programs. On Linux, the profiler implementation does not depend on this, but on macOS, we recommend setting the -fno-omit-frame-pointer compilation flag for gcc and both -fno-omit-frame-pointer and -mno-omit-leaf-frame-pointer for clang. Set(CMAKE_C_FLAGS "$ -O0")Īlso, compilers can use the frame pointer register as a general-purpose register for optimization purposes, which may lead to broken stack traces. To make sure none of the frames are missing due to inlining, set the optimization level to -O0 in your CMakeLists.txt: The profiler relies on debug information to provide meaningful output data and navigation, so Debug configurations are preferable to be used for profiling.Ĭompiler optimizations, such as inlining, can influence profiling results. You can also set the path manually in Settings | Build, Execution, Deployment | Dynamic Analysis Tools | Perf (or DTrace). You can set this up by adding set(CMAKE_OSX_ARCHITECTURES "arm64") to your CMakeLists.txt.ĬLion automatically detects the Perf or DTrace executable in case its location is included in the PATH environment variable. When working on Apple M1, make sure your application is built for the arm64 architecture and not 圆4. On Apple silicon machines, DTrace's default protection level allows profiling arm64 applications only. Check it by calling the dtrace command in the terminal. The only required tool is DTrace, which is most likely installed by default on your macOS.
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