DMD compilation speed

[Jake The Baker via Digitalmars-d]

On Monday, 30 March 2015 at 22:47:51 UTC, lobo wrote:
> On Monday, 30 March 2015 at 22:39:51 UTC, lobo wrote:
>> On Sunday, 29 March 2015 at 23:14:31 UTC, Martin Krejcirik 
>> wrote:
>>> It seems like every DMD release makes compilation slower. 
>>> This time I see 10.8s vs 7.8s on my little project. I know 
>>> this is generally least of concern, and D1's lighting-fast 
>>> times are long gone, but since Walter often claims D's 
>>> superior compilation speeds, maybe some profiling is in order 
>>> ?
>>
>> I'm finding memory usage the biggest problem for me. 3s speed 
>> increase is not nice but an increase of 500MB RAM usage with 
>> DMD 2.067 over 2.066 means I can no longer build one of my 
>> projects.
>>
>> bye,
>> lobo
>
> I should add that I am on a 32-bit machine with 4GB RAM. I just 
> ran some tests measuring RAM usage:
>
> DMD 2.067 ~4.2GB (fails here so not sure of the full amount 
> required)
> DMD 2.066 ~3.7GB (maximum)
> DMD 2.065 ~3.1GB (maximum)
>
> It was right on the edge with 2.066 anyway but this trend of 
> more RAM usage seems to also be occurring with each DMD release.
>
> bye,
> lobo

As far as memory is concerned. How hard would it be to simply 
have DMD use a swap file? This would fix the out of memory issues 
and provide some safety(at least you can get your project to 
compile. Seems like it would be a relatively simple thing to add?