gprof

问题 I have a C program that calls a function pi_calcPiItem() 600000000 times through the function pi_calcPiBlock . So to analyze the time spent in the functions I used GNU gprof. The result seems to be erroneous since all calls are attributed to main() instead. Furthermore the call graph does not make any sense: Each sample counts as 0.01 seconds. % cumulative self self total time seconds seconds calls Ts/call Ts/call name 61.29 9.28 9.28 pi_calcPiItem 15.85 11.68 2.40 pi_calcPiBlock 11.96 13.49

问题 I am running cygwin on windows and using latest version of gprof for profiling my code. My problem is that the flat profile shows zero sec for each of the functions in my code, I even tried to loop the functions(tried a for loop for a million) but gprof is unable to accumulate any time .Please help . Here is one of my sample function. bool is_adjacent(const char* a ,const char* b) { for(long long iter=0;iter<=1000000;iter++){ string line1="qwertyuiop"; string line2="asdfghjkl"; string line3=

问题 I am trying to find a performance issue in my program and thus instrumented the code with profiling. gprof creates a flat profile like this: Flat profile: Each sample counts as 0.01 seconds. % cumulative self self total time seconds seconds calls ms/call ms/call name 27.97 4.10 4.10 std::_Deque_iterator<char, char&, char*>::_Deque_iterator(std::_Deque_iterator<char, char&, char*> const&) 6.96 5.12 1.02 std::_Deque_iterator<char, char&, char*>::difference_type std::operator-<char, char&, char*

问题 I have looked at dozens of tutorials for profiling with gprof. I'm trying to work with code for the SMT solver dReal. To build the program, I first installed g++-4.8, Bison, Flex, and Cmake. Then to build dReal, the instructions said to execute the following: git clone git@github.com:soonhokong/dReal.git dreal cd dreal mkdir -p build/release cd build/release cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_CXX_COMPILER=g++-4.8 -DCMAKE_C_COMPILER=gcc-4.8 ../../src make Where in here am I supposed to

问题 After compiling with flags: -O0 -p -pg -Wall -c on GCC and -p -pg on the MinGW linker, the eclipse plugin gprof for shows no results. After that I did a cmd call using gprof my.exe gmon.out > prof.txt , which resulted in a report witth only the number of calls to functions. Flat profile: Each sample counts as 0.01 seconds. no time accumulated % cumulative self self total time seconds seconds calls Ts/call Ts/call name 0.00 0.00 0.00 16000 0.00 0.00 vector_norm 0.00 0.00 0.00 16 0.00 0.00 rbf

问题 I'm running Ubuntu 16.10 and trying to profile a program using gprof. I compile with the flag -pg and the program is single-threaded. The actual compile commands are: g++ -I. -std=c++11 -Wall -Wextra -O3 -pg -fPIC -Wno-unused-parameter -c -o build/obj/performance/stencil_application.o test/performance/stencil_application.cpp g++ -I. -std=c++11 -Wall -Wextra -O3 -pg -Wno-unused-parameter build/obj/performance/stencil_application.o -o build/test/performance/stencil_application The program takes

问题 I'm running Ubuntu 16.10 and trying to profile a program using gprof. I compile with the flag -pg and the program is single-threaded. The actual compile commands are: g++ -I. -std=c++11 -Wall -Wextra -O3 -pg -fPIC -Wno-unused-parameter -c -o build/obj/performance/stencil_application.o test/performance/stencil_application.cpp g++ -I. -std=c++11 -Wall -Wextra -O3 -pg -Wno-unused-parameter build/obj/performance/stencil_application.o -o build/test/performance/stencil_application The program takes

问题 When compiling my c++ sources with the -pg option to inject gprof profile instrumentation code the compile fails with the undefined reference to _mcount error. Without this option everything compiles (and runs) fine. What is wrong in my case? (Solaris 10 SPARC Platform) 回答1: Are you both compiling each object file and linking the final executable using the '-pg' flag? 来源： https://stackoverflow.com/questions/4603298/gcc-undefined-reference-to-mcount-gprof-instrumentation

问题 I am attempting to profile some c++ code, compiled with g++ including the option -pg, using gprof. However, in spite of the fact that the program takes 10-15 minutes to run on my computer (with the CPU maxed out), the % time, cumulative seconds and self seconds columns of the table produced by gprof are entirely 0.00s! The calls column contains correct looking data, for example over 150,000 calls to a basic function. Here is a sample of the data collected: % cumulative self self total time

问题 This question already has answers here : Function execution time (2 answers) Closed 5 years ago . I want to find out the time spent by a particular function in my program. FOr that purpose, I am making use of gprof. I used the following command to get the time for the specific function but still the log file displays the results for all the functions present in the program. Please help me in this regard. gprof -F FunctionName Executable gmon.out>log 回答1: You are nearly repeating another