DMD compilation speed

[ketmar via Digitalmars-d]

On Tue, 31 Mar 2015 05:57:45 +0000, Vladimir Panteleev wrote:

> On Tuesday, 31 March 2015 at 05:42:02 UTC, ketmar wrote:
>> i think that DDMD can start with GC turned off, and automatically turn
>> it on when RAM consumption goes over 1GB, for example. this way
>> small-sized (and even middle-sized) projects without heavy CTFE will
>> still enjoy "nofree is fast" strategy, and big projects will not eat
>> the whole box'
>> RAM.
> 
> Recording the information necessary to free memory costs performance
> (and more memory) itself. With a basic bump-the-pointer scheme, you
> don't need to worry about page sizes or free lists or heap fragmentation
> - all allocated data is contiguous, there is no metadata, and you can't
> back out of that.

TANSTAAFL. alas. yet without `free()` there aren't free lists to scan and 
so on, so it can be almost as fast as bump-the-pointer. the good thing is 
that user doesn't have to do the work that machine can do for him, i.e. 
thinking about how to invoke the compiler -- with GC or without GC.
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