Have you checked how changing the optimization level affects build times? Are you using template Haskell?

On Tuesday, September 29, 2015, aditya siram <aditya.siram@gmail.com> wrote:

Hi all,

Since upgrading to 7.10.2 from 7.8.4 I'm seeing a significant increase in compilation time. I understand this is a known issue but since I'm seeing something like a 3x slowdown but not across the board, I thought I'd ask.

Compilation time for the library I'm writing has remained about the same. I am seeing the slowdown when compiling executables that use the library. There are no other dependencies except base so I'm guessing it something in my library causing the issue.

I lean heavily on the FFI, OverlappingInstances and HList style programming in my library which leads me to believe that one of these is causing it. I am seeing no difference in compilation speeds by adding the per instance OVERLAPPING pragmas.

Can anyone advise or instruct me on how to profile the compiler?

Thanks!

-deech