How can I get profile data?

Hello,
 
       I am a student coming from China and  I am interesting in sablevm. Now I am studying GC Algorithm in sablevm, but I can't get profile data using gprof through adding CFLAGS optional to configure.
 
      First, I add CFLAGS=-pg as configure's optional. After configure, make and make install, I get gmon.out;
      Then, I use gprof to analyse gmon.out, but I can't get subfunctions's profile data. The result as following:
 
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       14     0.00     0.00  data_start
  0.00      0.00     0.00        2     0.00     0.00  getProperties
  0.00      0.00     0.00        1     0.00     0.00  parseConfig
  0.00      0.00     0.00        1     0.00     0.00  printVersionAndCopyright
^L
                        Call graph

granularity: each sample hit covers 4 byte(s) no time propagated
index % time    self  children    called     name
                0.00    0.00      14/14          main [18]
[1]      0.0    0.00    0.00      14         data_start [1]
-----------------------------------------------
                0.00    0.00       2/2           parseConfig [3]
[2]      0.0    0.00    0.00       2         getProperties [2]
-----------------------------------------------
                0.00    0.00       1/1           main [18]
[3]      0.0    0.00    0.00       1         parseConfig [3]
                0.00    0.00       2/2           getProperties [2]
-----------------------------------------------
                0.00    0.00       1/1           main [18]
[4]      0.0    0.00    0.00       1         printVersionAndCopyright [4]
-----------------------------------------------
^L
Index by function name
   [1] data_start              [3] parseConfig (gmon-start.c)
   [2] getProperties (gmon-start.c) [4] printVersionAndCopyright (gmon-start.c)

 
I don't find where I have made the mistake. Can you help me? Thanks!
 
                                                                             yours,
                                                                                 yang fei
 
 
 
 
 




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