Really easy optimization with std.experimental.allocator

[Dicebot via Digitalmars-d-learn]

On Sunday, 18 September 2016 at 01:44:10 UTC, Ryan wrote:
> I think it works because each time you call dispose it tells 
> the GC to mark that memory as available, without the GC needing 
> to do a collection sweep. This could be a really useful tip in 
> the allocators section, as I see converting to IAllocator with 
> the GC as the first step in testing optimizations with 
> allocators.

A bit more than that - because you dispose and allocate same 
amount of memory, you effectively reuse same memory block in GC 
pools over and over again. It is hardly surprising that this is 
much faster than "honest" allocation of lot of memory across 
different pools (CPU memory cache access pattern alone will make 
a huge difference).