Woeful performance of D compared to C++

[Bill Baxter]

Walter Bright wrote:
> Lionello Lunesu wrote:
>> This might solve the performace in this case, but Walter, have you 
>> checked the thread "Why is this D code slower than C++" in 
>> digitalmars.D.learn ?
> 
> The first thing I'd try is using DMD's built-in profiler:
> 
>     dmd -profile test.d

Been done.  The main thing it shows is that the Sphere.Intersect routine 
is a hotspot.  The other hotspot is the big recursive Raytrace function 
itself, but that's not so useful without a line-by-line breakdown since 
basically everything happens inside there.

The D trace.log is at:
   http://www.webpages.uidaho.edu/~shro8822/trace.log

The C++ log was attached to a post:
http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D.learn&article_id=5958

Though I'm not sure it's useful to compare them, because I think it was 
two different machines that ran the two.

--bb