Cost of includes
2014-10-02
For each src/.cc file there is detailed log in logs/.cc.txt with:
- strace summary of syscalls times and number of executions
- wall clock time it took to compile
- number of header locations which whare tried
- number of opened (not unique) headers
- number of headers according to gcc -M
Compilation was done with -Os using g++ (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Summary:
src/all.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
69.13 0.280109 7 39941 6178 lstat
17.69 0.071678 9 7798 6200 open
4.00 0.016206 10 1650 read
2.81 0.011378 7 1598 close
real 4.93
tried to open 7700 headers
opened 1555 headers
depends on 968 headers
src/bind.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
61.35 0.024457 7 3545 517 lstat
16.09 0.006413 9 696 539 open
4.96 0.001977 13 156 read
2.91 0.001160 7 157 close
real 0.31
tried to open 617 headers
opened 118 headers
depends on 108 headers
src/empty.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
14.51 0.000942 10 90 mmap
12.88 0.000836 13 66 29 open
12.14 0.000788 22 36 read
10.09 0.000655 11 60 29 stat
real 0.05
tried to open 8 headers
opened 1 headers
depends on 1 headers
src/map.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
32.02 0.004875 11 460 42 lstat
13.78 0.002098 15 136 64 open
10.20 0.001553 22 71 read
8.43 0.001283 13 96 mmap
real 0.13
tried to open 78 headers
opened 36 headers
depends on 36 headers
src/mpl_apply_and_vector.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
70.61 0.079509 7 11277 1736 lstat
17.13 0.019287 9 2093 1758 open
2.93 0.003298 10 334 read
2.04 0.002296 7 335 close
real 0.69
tried to open 2014 headers
opened 296 headers
depends on 256 headers
src/optional.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
64.42 0.071699 7 10565 1576 lstat
16.86 0.018767 9 2060 1598 open
4.76 0.005293 5 997 mmap
4.72 0.005257 11 462 read
real 1.06
tried to open 1974 headers
opened 422 headers
depends on 299 headers
src/shared_ptr.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
59.20 0.029393 7 4198 576 lstat
16.67 0.008275 10 833 598 open
6.72 0.003337 14 235 read
3.62 0.001797 8 235 close
real 0.48
tried to open 747 headers
opened 195 headers
depends on 162 headers
src/sstream.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
47.04 0.011771 7 1710 202 lstat
15.54 0.003888 11 368 224 open
9.16 0.002293 16 143 read
5.39 0.001349 13 103 mmap
real 0.29
tried to open 303 headers
opened 107 headers
depends on 94 headers
src/string.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
44.86 0.009815 6 1540 193 lstat
15.52 0.003396 10 336 215 open
9.18 0.002008 17 120 read
5.79 0.001266 13 100 mmap
real 0.20
tried to open 271 headers
opened 84 headers
depends on 73 headers
src/thread.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
67.58 0.208776 7 30597 4689 lstat
17.40 0.053756 9 6037 4711 open
4.39 0.013553 10 1378 read
2.93 0.009059 7 1326 close
real 4.23
tried to open 5939 headers
opened 1283 headers
depends on 782 headers
src/variant.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
69.27 0.148890 7 21371 3300 lstat
17.52 0.037660 9 4111 3322 open
3.49 0.007495 9 789 read
2.93 0.006300 6 1007 mmap
real 1.80
tried to open 4025 headers
opened 749 headers
depends on 514 headers
src/vector.cc
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
24.69 0.003097 7 466 42 lstat
14.58 0.001829 13 137 64 open
11.10 0.001392 19 72 read
9.65 0.001210 12 97 mmap
real 0.13
tried to open 79 headers
opened 37 headers
depends on 37 headers