Hi, check_for_temporal_macros could stop searching if both macros have been found? I cannot tell if doing that would make any real difference.
Regards, Anders 7 nov 2010 kl. 22.13 skrev Justin Lebar: > This patch is a followup to the discussion in "Questions about two hot > functions in ccache". > > On my machine, the patch speeds up direct mode cache hits by about a > factor of 1.7 for the c++_includes.cc test file. My benchmark of > |make clean && time make| in Mozilla's docshell/base went from 1.04s > (git master) to 0.64s, a 1.63x speedup. > > Full output from ../perf.py on c++_includes.cc is included below. > > I suspect we could use the fast_hash function for preprocessor mode > without much work. I also suspect that switching to a smarter > algorithm for searching for "#include" would decrease the cost of > cache misses. But I haven't profiled either of these cases. > > I'm a bit concerned about the fact that I had to change the reported > file lengths in the manifest test (in test.sh). I'm not sure what's > going on here; I may well have messed something up. Hopefully not. > :) > > -Justin > > $ ../perf.py -n10 --hit-factor=10 --ccache=../ccache gcc-4.5 c++_includes.cc > Compilation command: gcc-4.5 c++_includes.cc -c -o c++_includes.o > Compilercheck: mtime > Compression: off > Hardlink: off > Nostats: off > > * git master (9cdd1154) > Without ccache: 3.55 s (100.00 %) ( 1.00 x) > With ccache, preprocessor mode, cache miss: 4.16 s (117.10 %) ( 0.85 x) > With ccache, preprocessor mode, cache hit: 0.87 s ( 24.51 %) ( 4.08 x) > With ccache, direct mode, cache miss: 4.22 s (118.98 %) ( 0.84 x) > With ccache, direct mode, cache hit: 0.15 s ( 4.36 %) (22.92 x) > > * patched > Without ccache: 3.53 s (100.00 %) ( 1.00 x) > With ccache, preprocessor mode, cache miss: 4.13 s (116.90 %) ( 0.86 x) > With ccache, preprocessor mode, cache hit: 0.86 s ( 24.25 %) ( 4.12 x) > With ccache, direct mode, cache miss: 4.15 s (117.55 %) ( 0.85 x) > With ccache, direct mode, cache hit: 0.09 s ( 2.47 %) (40.43 x) > > * Speedup: = .15 / .09 = 1.7x > <diff>_______________________________________________ > ccache mailing list > ccache@lists.samba.org > https://lists.samba.org/mailman/listinfo/ccache Anders Furuhed Pantor Engineering AB +46 8 412 9781 _______________________________________________ ccache mailing list ccache@lists.samba.org https://lists.samba.org/mailman/listinfo/ccache