Hi all, I've been using gcc-4.5.0 with -flto to build Freecell Solver ( http://fc-solve.berlios.de/ ) - a C library for solving several types of Solitaire games. During one commit to the svn repository, I got a major slowdown in the performance of a benchmark. The attached text file explains how to reproduce this. Here's what I know: 1. There doesn't appear to be a slowdown on my Acer x86-64 Dual Core laptop. 2. It's only on my Pentium 4 2.4 GHz machine. 3. gcc-4.4.3-2mnb2 is better in this respect, though naturally, without gcc-4.5.0's -flto it produces slower binaries. 4. I'm running Mandriva GNU/Linux Cooker in case that matters. 5. I'm using Google's tcmalloc - http://goog-perftools.sourceforge.net/doc/tcmalloc.html . Can anyone shed some light on why this is the case? Regards, Shlomi Fish -- ----------------------------------------------------------------- Shlomi Fish http://www.shlomifish.org/ What does "Zionism" mean? - http://shlom.in/def-zionism God considered inflicting XSLT as the tenth plague of Egypt, but then decided against it because he thought it would be too evil. Please reply to list if it's a mailing list post - http://shlom.in/reply .
1. svn co http://svn.berlios.de/svnroot/repos/fc-solve/tags/gcc-4.5-slowdown-Before/fc-solve/source/ Before 2. cd Before 3. make -f Makefile.bench bench 4. grep ^ DUMPS/dump* -------------------------------------------- 1. svn co http://svn.berlios.de/svnroot/repos/fc-solve/tags/gcc-4.5-slowdown-After/fc-solve/source/ After 2. cd After 3. make -f Makefile.bench bench 4. grep ^ DUMPS/dump*
