> On Aug 29, 2017, at 6:36 PM, Maciej Stachowiak <m...@apple.com> wrote:
> 
> 
> 
>> On Aug 29, 2017, at 5:54 PM, Sam Weinig <wei...@apple.com 
>> <mailto:wei...@apple.com>> wrote:
>> 
>> 
>> 
>>> On Aug 29, 2017, at 12:46 PM, Geoffrey Garen <gga...@apple.com 
>>> <mailto:gga...@apple.com>> wrote:
>>> 
>>>> This isn’t the scenario I find myself in most often.  A much more common 
>>>> scenario is working on a change; touch one or two files, and then compile 
>>>> and test/debug.  Rinse and repeat.
>>> 
>>> We’ve already tested this case. The worst case slowdown, if you touch a 
>>> small file that's in the same bundle as the biggest .cpp file in the 
>>> project, is 6s => 7s (20%).
>>> 
>>> Geoff
>> 
>> I see larger than ~6 second build times with this scenario, not measure 
>> scientifically, but I would approximate it more around 20 - 30 seconds. Do 
>> you expect the 20% to scale linearly?
> 
> Is that just compile time or total build time including build system 
> overhead? I found that for single-file builds the compile step is less than 
> half the total time.


I’m not entirely sure. I usually don’t pay attention to what is happening 
during the compile.  From doing one right now, it seems to be about 50-50 for 
one small file.

- Sam

> 
> 
>> 
>> 
>> In a completely other direction, what does this mean for use of Xcode? Can 
>> we still build from Xcode? Debug?
>> 
>> - Sam
>> 
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