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