[xmlp] the recent garbage collector performance improvements

[dsimcha]

On Thursday, 2 February 2012 at 01:27:44 UTC, bearophile wrote:
> Richard Webb:
>
>> Parsing the file with DMD 2.057 takes ~25 seconds
>> 
>> Parsing the file with DMD 2.058(Git) takes ~6.1 seconds
>> 
>> Parsing the file with DMD 2.058, with the GC disabled during 
>> the LoadFile call, takes ~2.2 seconds.
>> 
>> 
>> For comparison, MSXML6 takes 1.6 seconds to load the same file.
>
> Not too much time ago Python devs have added an heuristic to 
> the Python GC (that is a reference counter + cycle breaker), it 
> "switches off" if it detects the program is allocating many 
> items in a short time. Is it possible to add something similar 
> to the D GC?
>
> Bye,
> bearophile

I actually tried to add something like this a while back but I 
couldn't find a heuristic that worked reasonably well.  The idea 
was just to create a timeout where the GC can't run for x 
milliseconds after it just ran.