------- Comment #9 from vz-gcc at zeitlins dot org 2010-04-03 17:15 ------- Just to bring some more hard numbers into this discussion, I've installed both 4.4 and 4.5 (in addition to 3.4.5 which I'll use as a kind of baseline) on my own machine (4/8 physical/logical CPUs, 8GB of RAM, Windows 7 64 bits). The results of building the (main) part of wxWidgets with default configure options excluding some third party libraries (jpeg/tiff/regex):
- With 3.4.5 (mingw-vista special r3): % time make -sj8 wxcore make -sj8 wxcore 30.29s user 51.71s system 46% cpu 2:55.61 total % du -sh lib 24M lib % du -sSh . 29M . - With 4.4.0 (GCC): % time make -sj8 wxcore make -sj8 wxcore 24.50s user 43.66s system 46% cpu 2:27.97 total % du -sh lib 29M lib % du -sSh . 90M . - With 4.5.0 20100311 (experimental) (GCC): % time make -sj8 wxcore make -sj8 wxcore 33.25s user 57.26s system 6% cpu 23:26.19 total % du -sh lib 80M lib % du -sSh . 554M . - Summary of the sizes of the DLL: % du -h */lib/wxmsw291u_core_gcc_custom.dll 9.2M wx-mswudll-gcc3.4/lib/wxmsw291u_core_gcc_custom.dll 12M wx-mswudll-gcc4.4/lib/wxmsw291u_core_gcc_custom.dll 47M wx-mswudll-gcc4.5/lib/wxmsw291u_core_gcc_custom.dll The numbers are quite clear and this is without debug information! Notice the drastic reduction in the CPU usage for 4.5: most of the time is clearly spent writing the files (and it's an Intel G2 SSD, things would probably be even worse with a slower disk) and not compiling at all. And while the increase in the size of the object files (they are mostly what makes for "du -sSh" output) is less than what was reported before, the size of the DLLs themselves increased as well (the previous tester couldn't report this as he didn't even manage to link them, of course). And while the compilation time change alone (10 times slower!) makes 4.5 unusable IMO, the change in library sizes is pretty horrible too (almost 4 times larger). I don't know who should handle it but I don't understand how can anybody not see that it is a real problem. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43601
