On 19-Aug-2015 00:43, Walter Bright wrote:
On 8/18/2015 1:33 PM, Jacob Carlborg wrote:
There's profile guided optimization, which LLVM supports.
dmd does have that to some extent. If you run with -profile, the
profiler will emit a trace.def file. This is a script which can be fed
to the linker which controls the layout of functions in the executable.
The layout is organized so that strongly connected functions reside in
the same page, minimizing swapping and maximizing cache hits.
Unfortunately, nobody makes use of it, which makes me reluctant to
expend further effort on PGO.
http://www.digitalmars.com/ctg/trace.html
I wonder how many people actually use the llvm profile guided
optimizations. I suspect very, very few.
I guess this needs a prominent article to show some bung for the buck.
--
Dmitry Olshansky
