[xmlp] the recent garbage collector performance improvements

[dsimcha]

On Wednesday, 1 February 2012 at 22:53:11 UTC, Richard Webb wrote:
> For reference, the file i was testing with has ~50000 root 
> nodes, each of which has several children.
> The number of nodes seems to have a much larger effect on the 
> speed that the amount of data.
>

Sounds about right.  For very small allocations sweeping time 
dominates the total GC time.  You can see the breakdown at 
https://github.com/dsimcha/druntime/wiki/GC-Optimizations-Round-2 
.  The Tree1 benchmark is the very small allocation benchmark.  
Sweeping takes time linear in the number of memory blocks 
allocated and, for blocks <1 page, constant time in the size of 
the blocks.