More embarrassing microbenchmars for D's GC.

[Leandro Lucarella]

Walter Bright, el 10 de junio a las 14:13 me escribiste:
> >But there is no GC activity there right?
> 
> Instrument it to be sure.

Doesn't seems to be running. But it's weird you can tell for sure being
the author :S

> >>>2) Why is D malloc version ~33% slower than the C version? I took a look
> >>>  at the generated assembly and it's almost identical:
> >>>	<_Dmain+198>:   lea    -0x20(%ebp),%eax
> >>>	<_Dmain+201>:   lea    0x0(%esi,%eiz,1),%esi
> >>>	<_Dmain+208>:   addl   $0x1,0x8(%eax)
> >>>	<_Dmain+212>:   adcl   $0x0,0xc(%eax)
> >>>	<_Dmain+216>:   mov    (%eax),%eax
> >>>	<_Dmain+218>:   test   %eax,%eax
> >>>	<_Dmain+220>:   jne    0x804a240 <_Dmain+208>
> >>>	<main+248>:     lea    -0x1c(%ebp),%eax
> >>>	<main+251>:     nop
> >>>	<main+252>:     lea    0x0(%esi,%eiz,1),%esi
> >>>	<main+256>:     addl   $0x1,0x4(%eax)
> >>>	<main+260>:     adcl   $0x0,0x8(%eax)
> >>>	<main+264>:     mov    (%eax),%eax
> >>>	<main+266>:     test   %eax,%eax
> >>>	<main+268>:     jne    0x8048550 <main+256>
> >>>	<main+270>:     movl   $0x0,0x4(%esp)
> >>>	<main+278>:     movl   $0x8049800,(%esp)
> >>>Tests attached.
> >>Without running a profiler, there's no way to be sure about just where in the 
> >>code the time is being consumed.
> >Attached is the output of the gprof program (for the list-test-d-gc with
> >the GC running). I don't see any helpful information for the point 2), but
> >it shows clearly that most of the time is spent in garbage collection.
> 
> Break up your code into more functions to get better info from the profiler.

Is this useful (kcachegrind screenshoots, using callgrind with
--dump-instr=yes and --trace-jump=yes):
http://llucax.com.ar/~luca/kcachegrind-d.png
http://llucax.com.ar/~luca/kcachegrind-c.png

-- 
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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