[Haskell-cafe] 7.10.2 : Compilation slowdown.

David Kraeutmann kane at kane.cx
Wed Sep 30 23:22:34 UTC 2015

Can you post a minimal example that exhibits the compile time increase?

On Thu, Oct 1, 2015 at 12:25 AM, aditya siram <aditya.siram at gmail.com> wrote:
> I'm not using any -O* flags and I'm not using Template Haskell. Not sure if
> this means anything but I do have the context-stack set to 220.
> Thanks!
> -deech
> On Wed, Sep 30, 2015 at 8:47 AM, Carter Schonwald
> <carter.schonwald at gmail.com> wrote:
>> 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 at 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
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