measure time in a function in C

Question

I\'m debugging an C application and I\'d like to know how much time it spends in a particular function.

I could change the source code and add some more code to do the m

Answer 1

Profiling is probably what you want. Take a look at prof or gprof.

UPDATE: After compilng with "cc -Wall -ggdb -pg -g3 -O2 diskhash.c -o diskhash" ( and running the program), "gprof -p diskhash" gives me:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls  ms/call  ms/call  name    
 32.60      0.41     0.41        1   410.75   646.18  create_hashtab
 31.80      0.81     0.40  5087692     0.00     0.00  hash_func
 27.83      1.16     0.35  2543846     0.00     0.00  find_hash
  2.78      1.20     0.04  2543846     0.00     0.00  chop_a_line
  1.59      1.22     0.02                             main
  0.40      1.22     0.01                             frame_dummy
  0.00      1.22     0.00        4     0.00     0.00  map_da_file