Building is slow!

[Arek]

On Saturday, 2 December 2017 at 09:50:32 UTC, Ivan Trombley wrote:
> On Saturday, 2 December 2017 at 03:08:10 UTC, rjframe wrote:
>> There is a --parallel flag: `dub build --parallel`.
>>
>> The help string says it "Runs multiple compiler instances in 
>> parallel, if possible."
>
> Thanks, I'll give that a try. After an hour, I pressed CTRL+C, 
> shut it down and went home.

By default, when you run `dub build` building is done in mode 
'separate', what means all source files are compiled at once in 
one dmd instance.

In case of big project it can consume a lot of memory and 
sometimes swaps intensively.
Also "--parallel" doesn't change anything, because there is only 
one process of the compiler so it runs on one core only.

You can try `dub build --build-mode=single-file --parallel`. It 
will execute separate instance of compiler for each source file. 
If --parallel is given, dub will launch several instances of dmd 
in parallel.