New subject: Very _very_ slow compiles on Windows 10 - solved

17 Sep 2016


      Sorry, I forgot to answer to all...

------ Originalnachricht ------
Von: "Nicu Ionita" 
An: "Malcolm Wallace" 
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!
Nicu
------ Originalnachricht ------
Von: "Malcolm Wallace" 
An: "Nicu Ionita" 
Cc: "haskell-cafe@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  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.
Nicu
------ Originalnachricht ------
Von: "A.M." 
An: haskell-cafe@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 
the
 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 
on
Ubuntu. Specifically, even after allocating 12 real CPUs to the VM, I
never see stack-invoked ghc use more than one CPU. On rare occasions,
the linker phase hangs. I have confirmed that ghc reports 12 
capabilities.
I'm just glad that Windows is not my primary development platform; 
it's
entirely possible that virtualization is the cause. VirtualBox is not
known for being a speed demon, but the compilation speed is indeed
embarrassing.
Cheers,
M
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Re: [Haskell-cafe] Very _very_ slow compiles on Windows 10

Nicu Ionita

Nicu Ionita

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