[swift-dev] Major SwiftPM compile time regression

[Mark Lacey]

> On Sep 24, 2016, at 11:20 PM, Daniel Dunbar <daniel_dunbar at apple.com> wrote:
> 
> Thanks! I guess this showed up as a result of the most recent LLVM sync then?

Yes, that seems like the most likely explanation.

Mark

> 
>  - Daniel
> 
>> On Sep 24, 2016, at 11:17 PM, Mark Lacey <mark.lacey at apple.com <mailto:mark.lacey at apple.com>> wrote:
>> 
>> I just pulled this up under Instruments and found that 94% of the compile time for StringMangling.swift.o, which seems to be where all the time goes, is spent in performLLVM, so this doesn’t look like a type checker issue.
>> 
>> Weight	Self Weight		Symbol Name
>> 10.32 min   94.4%	1.00 ms	 	       performLLVM(swift::IRGenOptions&, swift::DiagnosticEngine&, llvm::sys::SmartMutex<false>*, llvm::GlobalVariable*, llvm::Module*, llvm::TargetMachine*, swift::version::Version const&, llvm::StringRef)
>> 
>> I attached a screen shot from Instruments to the bug.
>> 
>> Mark
>> 
>>> On Sep 24, 2016, at 9:25 PM, Daniel Dunbar <daniel_dunbar at apple.com <mailto:daniel_dunbar at apple.com>> wrote:
>>> 
>>> I'm assuming its the type checker based on how it manifests (and we haven't changed anything interesting in the module that is slow to build), but I haven't looked at any samples.
>>> 
>>>  - Daniel
>>> 
>>>> On Sep 24, 2016, at 9:23 PM, Ted Kremenek <kremenek at apple.com <mailto:kremenek at apple.com>> wrote:
>>>> 
>>>> Does this look related to the type checker (I saw Mark’s comments in the SR) or something else?
>>>> 
>>>>> On Sep 24, 2016, at 3:23 PM, Daniel Dunbar via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
>>>>> 
>>>>> Swift TOT is currently taking a very long time (and upwards of 8GB) to build SwiftPM. I filed:
>>>>>  https://bugs.swift.org/browse/SR-2754 <https://bugs.swift.org/browse/SR-2754>
>>>>> can someone on the compiler take a look? This makes it hard to develop with TOT.
>>>>> 
>>>>> - Daniel
>>>>> 
>>>>> _______________________________________________
>>>>> swift-dev mailing list
>>>>> swift-dev at swift.org <mailto:swift-dev at swift.org>
>>>>> https://lists.swift.org/mailman/listinfo/swift-dev <https://lists.swift.org/mailman/listinfo/swift-dev>
>>>> 
>>> 
>> 
> 

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