Date: Wed, 27 May 2015 16:09:55 +0300 From: Timo Teras <timo.teras@....fi> To: Alexander Monakov <amonakov@...ras.ru> Cc: musl@...ts.openwall.com Subject: Re: Question re: dynamic linking in musl On Wed, 27 May 2015 16:01:50 +0300 (MSK) Alexander Monakov <amonakov@...ras.ru> wrote: > On Wed, 27 May 2015, Alex Dowad wrote: > > > Can you also provide exact figures? For example your callgrind > > > logs? Or just > > > 'time' statistics for executables that spend much time in the > > > dynamic linker. > > Callgrind data attached. > > Oh. The profile makes it evident that most of the libraries > lack .gnu.hash, and the lookup is almost always using SysV lookup. > With many dependencies SysV lookup is slower: in my testing with > Clang/LLVM I got something like 420 ms (compared to 240 ms unpatched > or 110 ms patched musl with .gnu.hash lookup). > > I'm not familiar with Alpine. Hopefully someone else can chime in > whether .gnu.hash is deliberately disabled. We have not touched, so we are using the gcc default. Which apparently then is sysv only (bummer). I wonder if it's better to have both, or gnu only? /Timo
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