Request for comments: std.d.lexer

[Dmitry Olshansky]

28-Feb-2013 21:27, Dmitry Olshansky пишет:
> 28-Feb-2013 13:09, Brian Schott пишет:
>> On Saturday, 9 February 2013 at 07:55:04 UTC, Walter Bright wrote:
>>> On 2/4/2013 7:19 PM, Brian Schott wrote:
>>>> Still only half speed. I'm becoming more and more convinced that
>>>> Walter is
>>>> actually a wizard.
>>>
>>> I worship the Dark Arts.
>>
>> *recites incantations*
>> *merges pull requests*
>> *adds unit tests*
>>
>> http://hackerpilot.github.com/experimental/std_lexer/images/times4.png
>
> Looking far better now. Keep in mind that we still don't use the
> original dmd's sentinel magic to avoid length check in std.d.lexer :)
>
> Being that wizard who gave a couple of scrolls to Brain I'll outline
> some interesting data points collected while helping him out.
>

To clarify these are problems I observed but haven't solved/avoided 
completely:

> - D run-time takes some time to start up/shut down. It's on the order of
> 1ms for me vs 1/10th of ms for plain C
> - expanding on the previous point - GC.malloc takes sometime and
> triggers collections from time to time (2 collections to lex datetime,
> there is next to no garbage, but they run regardless).
>

And this one below is an experiment and not is not related to the 
numbers posted still.

> Even simply disabling GC at first and re-enabling it at the end of
> program speeds up the whole time by roughly 5% on my machine.


-- 
Dmitry Olshansky