[Haskell-cafe] Very _very_ slow compiles on Windows 10 - solved

Nicu Ionita nicu.ionita at acons.at
Sat Sep 17 13:14:40 UTC 2016

Yes, this is it!

I deactivated Windows Defender real time protection mode, then I 
compiled again: normal compilation times.

Thanks for the hint!

------ Originalnachricht ------
Von: "Nicu Ionita" <nicu.ionita at acons.at>
An: "haskell-cafe at haskell.org" <haskell-cafe at haskell.org>
Gesendet: 17.09.2016 09:14:18
Betreff: Re: [Haskell-cafe] Very _very_ slow compiles on Windows 10

>Sorry, I forgot to answer to all...
>------ Originalnachricht ------
>Von: "Nicu Ionita" <nicu.ionita at acons.at>
>An: "Malcolm Wallace" <malcolm.wallace at me.com>
>Gesendet: 17.09.2016 09:12:30
>Betreff: Re[2]: [Haskell-cafe] Very _very_ slow compiles on Windows 10
>>Oh, this could be a good hint! I don't have other protection except 
>>windows defender, which is own Windows AV. (Reviews suggest that this 
>>should be enough, altough on other PC - not with Windows 10 - I use 
>>different AVs) But maybe the Windows own AV exhibits the same 
>>behaviour. I will check this, thanks!
>>------ Originalnachricht ------
>>Von: "Malcolm Wallace" <malcolm.wallace at me.com>
>>An: "Nicu Ionita" <nicu.ionita at acons.at>
>>Cc: "haskell-cafe at haskell.org" <haskell-cafe at haskell.org>
>>Gesendet: 17.09.2016 08:44:30
>>Betreff: Re: [Haskell-cafe] Very _very_ slow compiles on Windows 10
>>>Do you have Symantec Endpoint Protection or similar antivirus? We 
>>>found that under certain paranoid settings, even  "ghc --version"  
>>>took upwards of seven seconds, and compilation was slowed by a couple 
>>>of orders of magnitude. We think the AV was scanning the (large) 
>>>compiler binary, plus any DLLs it loads, plus the source, interface, 
>>>and object files read and generated, On every invocation. Linking was 
>>>absolutely dog slow.  We also think the AV was deliberately throttled 
>>>to never use more than 10% of CPU time, to avoid being noticeable to 
>>>the user.
>>>It is possible that there are AV settings you can tweak to avoid the 
>>>paranoia, and trust the compiler, and any other file that has already 
>>>been scanned once.
>>>  Regards,
>>>     Malcolm (iPhone)
>>>On 17 Sep 2016, at 07:04, Nicu Ionita <nicu.ionita at acons.at> wrote:
>>>No virtualisation, it is a dual boot maschine.
>>>1 CPU would be good :-) In my case it is a very small fraction of it.
>>>------ Originalnachricht ------
>>>Von: "A.M." <agentm at themactionfaction.com>
>>>An: haskell-cafe at haskell.org
>>>Gesendet: 17.09.2016 03:20:38
>>>Betreff: Re: [Haskell-cafe] Very _very_ slow compiles on Windows 10
>>>>On 09/16/2016 06:10 PM, Nicu Ionita wrote:
>>>>>  Is anybody else experiencing really slow compilations with GHC 
>>>>>7.10.2 on
>>>>>  Windows 10?
>>>>>  I use stack to compile the project and run it under a mingw64
>>>>>  environment provided by Github bash. The CPU usage is very low all 
>>>>>  time (meaning: GHC does barely use the CPU). On same computer with
>>>>>  Ubuntu 16.04 it just compiles normally, but under Windows it is 
>>>>>for sure
>>>>>  10x slower, maybe even more.
>>>>Are you using virtualization? I see the same thing under virtualbox 
>>>>Ubuntu. Specifically, even after allocating 12 real CPUs to the VM, 
>>>>never see stack-invoked ghc use more than one CPU. On rare 
>>>>the linker phase hangs. I have confirmed that ghc reports 12 
>>>>I'm just glad that Windows is not my primary development platform; 
>>>>entirely possible that virtualization is the cause. VirtualBox is 
>>>>known for being a speed demon, but the compilation speed is indeed
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