gprof

The default the profile file is from the executable is run and the file is called gmon.out . Is there any way to specify a new location? I'm using gcc 3.4.6 on i386/linux2.6 jscoot Too badly, the environment variable GMON_OUT_PREFIX is not documented in the glibc. I got the following information from the web and tested on my machine. if you set the environment variable GMON_OUT_PREFIX , then the output file is named as ${GMON_OUT_PREFIX}.[PID] , the pid is the id of the profiled process. For example: GMON_OUT_PREFIX=mygmon; gcc -o foo -pg foo.c the gmon out file is: mygmon.12345 , assuming the

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) 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

Profiling some C++ number crunching code with both gprof and kcachegrind gives similar results for the functions that contribute most to the execution time (50-80% depending on input) but for functions between 10-30% both these tools give different results. Does it mean one of them is not reliable? What would yo do here? gprof is actually quite primitive. Here's what it does. 1) It samples the program counter at a constant rate and records how many samples land in each function (exclusive time). 2) It counts how many times any function A calls any function B. From that it can find out how many

My understanding is that by default gprof takes into account CPU time. Is there a way to get it to profile based on wall-clock time? My program does a lot of disk i/o, so the CPU time it uses only represents a fraction of the actual execution time. I need to know which portions of the disk i/o take up the most time. dronnix You can measure wall-clock time by using profiler from google-perftools. To switch google profiler to wall-clock mode, set the environment variable CPUPROFILE_REALTIME=1. Mike Dunlavey gprof won't do this. Look at this . And this. In a nutshell: Under gdb , get it running

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 seconds seconds calls Ts/call Ts/call name 0.00 0.00 0.00 156012 0.00 0.00 perm::operator[](int) const 0

This question already has an answer here: Function execution time 2 answers 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 Basile Starynkevitch You are nearly repeating another question about function execution time . As I answered there , there is a difficulty (due to hardware!) to get