Re: [Caml-list] Re: Performance of threaded interpreter on hyper-threaded CPU

[gang chen <gangchen_sh@yahoo.com>]

Does ocaml have benchmark programs for use by C
compiler writers and architecture developers as
performance measurement ?

Gang Chen

--- Xavier Leroy <Xavier.Leroy@inria.fr> wrote:


> The performance variations between the gcc versions
> confirm my
> impression that gcc is getting "too clever for its
> own good" --
> carefully hand-optimized code like the OCaml
> bytecode interpreter
> is best served by a compiler that compiles code
> nearly as written.
> (Think gcc 2.95.)
> 
> The P4 microarchitecture is known for its weird
> performance model:
> some code runs very fast, some similar code very
> slow.
> In my experience, AMD processors as well as the
> Pentium-M are
> much more consistent performance-wise.
> 
> If you really want to understand what's going on,
> you need a good
> performance analysis tool.  Timing runs will tell
> you nothing.
> Intel's VTUNE is king of the hill here, but the
> Windows version is
> costly and I could never install the free Linux
> version.
> 
> - Xavier Leroy
> 
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