[erlang-questions] benchmarks llvm vs gcc

mog <>
Tue Aug 5 20:48:02 CEST 2008


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So I was curious to see if i could get 5-10% boost out of Erlang r12b3 
via llvm built vm, turns out it actually decreases speed a bit in 
comparison to my gcc.  I used the http://shootout.alioth.debian.org for 
benchmark codes  and ran all benchmarks.  I would be happy to send all 
info if anyone is interested.

specrtalnorm
llvm Erlang          21.745 787.513 2698.601
- ---
gcc Erlang           6.736 241.999 885.979

hello
llvm Erlang           0.392  17.205  34.390  51.623  68.760
- ---
gcc Erlang           0.268  11.061  22.073  33.098  44.083

~ gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.3.1-2' 
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs 
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr 
--enable-shared --with-system-zlib --libexecdir=/usr/lib 
--without-included-gettext --enable-threads=posix --enable-nls 
--with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc 
--enable-mpfr --enable-targets=all --enable-cld 
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu 
--target=i486-linux-gnu
Thread model: posix
gcc version 4.3.1 (Debian 4.3.1-2)

~ llvm-gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../llvm-gcc4.2-2.2.source/configure 
--host=i486-linux-gnu --build=i486-linux-gnu 
--prefix=/usr/lib/llvm/gcc-4.2 --enable-languages=c,c++ 
--program-prefix=llvm- --enable-llvm=/usr/lib/llvm --enable-threads 
--disable-nls --disable-shared --disable-multilib --disable-bootstrap
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5546) (LLVM build)

Mog
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