Improving GDB startup time with large programs

Nick Savoiu savoiu@ics.uci.edu
Mon May 3 02:49:00 GMT 2004


>> How do I profile gdb?
>
>When you build gdb, configure as normal.
>Then use this command to build:

Here's what I got (the most significant stuff) with g++ 3.2. Seems that the number of symbols is the culprit.

Nick

--------------------------------

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 18.61      1.93     1.93  2013562     0.00     0.00  hash
 13.55      3.33     1.41  9757458     0.00     0.00  strcmp_iw_ordered
 11.86      4.57     1.23  2310964     0.00     0.00  htab_hash_string
  9.55      5.55     0.99  6206314     0.00     0.00  read_partial_die
  4.97      6.07     0.52  1906172     0.00     0.00  bcache_data
  3.38      6.42     0.35  5101168     0.00     0.00  read_indirect_string
  3.33      6.76     0.34 23770551     0.00     0.00  read_attribute_value
  3.18      7.09     0.33   948693     0.00     0.00  d_print_comp
  2.60      7.37     0.27  2032858     0.00     0.00  htab_find_slot_with_hash
  1.59      7.53     0.17  9203512     0.00     0.00  read_unsigned_leb128
  1.54      7.69     0.16 23770551     0.00     0.00  read_attribute
  1.25      7.82     0.13   256652     0.00     0.00  find_last_component
  1.25      7.95     0.13   131142     0.00     0.00  msymbol_hash_iw
  1.16      8.07     0.12  6643402     0.00     0.00  dwarf2_lookup_abbrev
  1.16      8.19     0.12  3934670     0.00     0.00  d_make_comp
  1.06      8.30     0.11  1906172     0.00     0.00  add_psymbol_to_list
  0.96      8.40     0.10    89224     0.00     0.00  cp_find_first_component_aux
  0.87      8.49     0.09 19615690     0.00     0.00  symbol_natural_name
  0.87      8.58     0.09 12864595     0.00     0.00  bfd_getl32
  0.87      8.67     0.09     1699     0.00     0.00  scan_partial_symbols
  0.77      8.75     0.08  2032858     0.00     0.00  symbol_set_names
  0.68      8.82     0.07 11166899     0.00     0.00  read_1_byte



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