On 28/11/12 12:48, Ian Lynagh wrote:
On Wed, Nov 28, 2012 at 09:20:57AM +0000, Simon Marlow wrote:
My personal opinion is that we should switch to dynamic-by-default on all x86_64 platforms, and OS X x86. The performance penalty for x86/Linux is too high (30%),
FWIW, if they're able to move from x86 static to x86_64 dynamic then there's only a ~15% difference overall:
Run Time -1 s.d. ----- -18.7% +1 s.d. ----- +60.5% Average ----- +14.2%
Mutator Time -1 s.d. ----- -29.0% +1 s.d. ----- +33.7% Average ----- -2.6%
GC Time -1 s.d. ----- +22.0% +1 s.d. ----- +116.1% Average ----- +62.4%
The figures on the wiki are different: x86 static -> x86_64 dynamic has +2.3% runtime. What's going on here? I'm not sure I buy the argument that it's ok to penalise x86/Linux users by 30% because they can use x86_64 instead, which is only 15% slower. Unlike OS X, Linux users using the 32-bit binaries probably have a 32-bit Linux installation, which can't run 64-bit binaries (32-bit is still the recommended Ubuntu installation for desktops, FWIW). Cheers, Simon