Re: Improving GDB startup time with large programs

[Nick Savoiu <savoiu at ics dot uci dot edu>]

For comparison here are the GDB 6.0 results:

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 32.24      2.36     2.36  2013564     0.00     0.00  hash
 16.12      3.54     1.18  2300832     0.00     0.00  htab_hash_string
  6.42      4.01     0.47  3975016     0.00     0.00  read_partial_die
  5.46      4.41     0.40  1906174     0.00     0.00  bcache
  3.21      4.64     0.23  2024256     0.00     0.00  htab_find_slot_with_hash
  2.60      4.83     0.19   591490     0.00     0.00  dyn_string_substring
  2.32      5.00     0.17   436495     0.00     0.00  strcmp_iw_ordered
  1.98      5.15     0.14 11899013     0.00     0.00  read_attribute_value
  1.78      5.28     0.13   118643     0.00     0.00  msymbol_hash
  1.57      5.39     0.12  6972300     0.00     0.00  read_unsigned_leb128
  1.50      5.50     0.11  4412114     0.00     0.00  dwarf2_lookup_abbrev
  1.50      5.62     0.11  2128935     0.00     0.00  read_indirect_string
  1.30      5.71     0.10  1906174     0.00     0.00  add_psymbol_to_list
  1.23      5.80     0.09    74808     0.00     0.00  msymbol_hash_iw
  1.16      5.88     0.09  6507274     0.00     0.00  dyn_string_resize
  1.09      5.96     0.08 11899013     0.00     0.00  read_attribute
  1.02      6.04     0.07     1699     0.00     0.00  scan_partial_symbols

Nick

On Sunday 02 May 2004 07:48 pm, Nick Savoiu wrote:
> >> 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