Date: Wed, 27 May 2015 15:15:03 +0200 From: Alex Dowad <alexinbeijing@...il.com> To: musl@...ts.openwall.com Subject: Re: Question re: dynamic linking in musl On 27/05/15 15:09, Timo Teras wrote: > 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). > Yes, that callgrind profile was from a program installed from Alpine repos. Use --hash-style=both in LD_FLAGS when building the APKs, and dynamic linking will become much faster! Alex
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