(轉)用GNU Profiler來提升代碼運行速度

適用於C, C++, Pascal, Fortran 77

原文連接：http://www.ibm.com/developerworks/cn/linux/l-gnuprof.html

 

本身的示例：

chenqi@chenqi-laptop ~/MyPro/Algorithms/sort $ gcc -o quicksort2 -std=gnu99 -O2 -pg optimized_quicksort.c cfunc.c
chenqi@chenqi-laptop ~/MyPro/Algorithms/sort $ ./quicksort2 1000000
start sorting ...
sorting finished!
====================================
Randomized Quicksort               
Sorting 1000000 elements
Time: 0s      298978us
The result is right !
====================================
chenqi@chenqi-laptop ~/MyPro/Algorithms/sort $ ls *.out
gmon.out
chenqi@chenqi-laptop ~/MyPro/Algorithms/sort $ gprof quicksort2 gmon.out -p
Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total          
 time   seconds   seconds    calls  ms/call  ms/call  name   
 95.83      0.23     0.23   666354     0.00     0.00  partition
  4.17      0.24     0.01        1    10.00   240.00  quicksort
  0.00      0.24     0.00        1     0.00     0.00  malloc_c