HELP: Change the sampling time in gprof

[perugupa@csee.wvu.edu]

Hi,
   I am new to this group.I have a problem with gprof.I dont know if this
   is the right place to ask this question.if not please let me know the
   correct place.
   i am extracting the execution profiles of the test cases on gcc sing
gprof.the output of the profile has all 0's for the self seconds colomn.is
there any way to change the sample time so that i can get reasonable
numbers in the colomn.default is 0.01 sec.i would like to change that to
0.001 or even lower...
any help will be appreciated.thank you.

regards,
Ranganath.