Using mingw gfortran gcc version 4.3.0 20061021 on Windows XP, I have created an executable with gfortran -pg a.f90 b.f90 and run the a.exe executable a.out to create a gmon.out file. When I run gprof gmon.out using GNU gprof 2.16.93 I get the output gprof: gmon.out: not in executable format Does gprof work with mingw gfortran? Vivek Rao