according to the changelog, nothing really has changed ... CCing to the ia64 list.
Duraid Madina writes: > Hi Mathias, Gerhard and others, > > I want to report a nasty performance regression in 3.3.5-12. Moving > from: > > gcc version 3.3.5 (Debian 1:3.3.5-11) > > to: > > gcc version 3.3.5 (Debian 1:3.3.5-12) > > leads to a large reduction in C++ software build speeds, due to > something that apparently makes 'ld' spend much, much more time than it > previously did. I reproduced this problem going backwards and forwards > between these versions by commands like: > > dpkg -i g++-3.3_3.3.5-11_ia64.deb gcc-3.3-base_3.3.5-11_ia64.deb > gcc-3.3_3.3.5-11_ia64.deb > > so, as far as I understand, neither libstdc++ nor binutils changed. > > How bad is the problem? Trying to build the LLVM compiler suite, > (say, version 1.4 from http://llvm.cs.uiuc.edu/releases/ ) on a 2-way IA64 > system with a simple ./configure; time make -j2 with gcc 3.3.5-11 gives: > > real 1048.03 > user 1979.93 > sys 54.37 > > but with gcc 3.3.5-12 gives: > > real 1641.14 > user 3037.64 > sys 49.62 > > Nasty! The build takes 60% longer with 3.3.5-12, and while I haven't > timed it accurately, the time spent in linking has _greatly_ increased, by a > factor of at least 5x, perhaps 10x. LLVM is fairly "normal" and portable > C++, though it is a large source base. (not quite mozilla-sized, though) > > Unfortunately, build times from (gcc version 3.4.4 20050314 > (prerelease) (Debian 3.4.3-12)) are more or less the same as those of > 3.3.5-12, i.e. slow. Again, components of LLVM take literally minutes to > link on a rather snappy Itanium system. I have not tested older versions of > 3.4 to see if these too have the performance regression from 3.3.5-11. > > I would appreciate it if you could bring this to the attention of > the relevant people, and I hope I'm posting this in the right place! If > anyone wants an even more painless way of reproducing this problem, please > contact me and I will provide a tarball that you can simply unpack, > configure, make. I'd also appreciate it if someone could confirm exactly > what has changed between the 3.3.5-11 and 3.3.5-12 packages of gcc, gcc-base > and g++. diffing gcc-3.3_3.3.5-11.diff and gcc-3.3_3.3.5-12.diff, I can't > see anything obviously responsible for this regression, so I wonder if > perhaps some sort of changed environment on whatever machine built > gcc-3.3.5-12 might be responsible for this regression. > > Finally, note that this is all on ia64. I imagine it is likely that > this regression is platform specific, but the only Debian systems I have > ready access to are ia64 ones, so I can't test this. > > Many thanks in advance, > > Duraid > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
