[Haskell-cafe] 7.10.2 : Compilation slowdown.

aditya siram aditya.siram at gmail.com
Wed Sep 30 22:25:03 UTC 2015

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.


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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