Garbage Collector

[js.mdnq]

On Friday, 30 November 2012 at 23:35:16 UTC, Ali Çehreli wrote:
> On 11/30/2012 03:21 PM, js.mdnq wrote:
>
> > I noticed that in both x64 and x86 builds the GC seems to get
> > exponentially slower as the objects are allocated.
>
> [...]
>
> > Since the sample code
>
> that you have forgotten to show ;)
>
> > allocates objects sequentially without any
> > deallocation it seems there is a huge "bug" in the GC code.
>
> Possible.
>
> > Can we expect improvements of the GC at in time in the near
> > future(months, not years)?
>
> Yes. There is already a precise GC implementation for D, which 
> should be available with dmd as early as 2.062.
>
> Ali

Cool. The code is basically taken off the first link. I modified 
it a little but the original code should work. All I did was 
increase the size of objects that are being allocated. I was 
mainly using GDC x64 though.

What I did was run the code and watch the memory usage as it ran. 
I noticed that it was getting slower and slower. Now, one could 
expect such if the main memory was fragmented and GDC could not 
allocate contiguous blocks, but I do not think that was the case 
and it happens for much smaller amounts of memory.

My guess, and just a guess, is that it does not reserve large 
enough blocks of memory once it is initial memory block is full.