GC statistics

[Rainer Schuetze]

On 10/10/2012 9:11 PM, Andrei Alexandrescu wrote:
> This is mostly for GC experts out there - what statistics are needed and
> useful, yet not too expensive to collect?
>
> https://github.com/D-Programming-Language/druntime/pull/236
>
>
> Andrei


What about allocation time? Including/excluding possible locks. A 
precise garbage collector might have to do extra book keeping affecting 
overall performance.

Running this precise GC 
https://github.com/rainers/druntime/tree/precise_gc2 against the 
benchmark 
https://github.com/rainers/druntime/blob/precise_gc2/benchmark/gcbench/tree1.d 
shows that it is about 20% slower than the conservative GC, most of the 
extra time eaten during allocation.