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@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 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

I unfortunately don't have time to pare it down to a small example, but fortunately I found that the latest HList on Hackage exhibits the same approximate behavior. When building the tests for HList-0.4.1.0, on 7.10.2 the module `Properties.LengthDependentSplice` ( http://hackage.haskell.org/package/HList-0.4.1.0/src/examples/Properties/Len...) takes 2m30secs to compile. The same file takes ~50secs on 7.8.4. Thanks! -deech On Wed, Sep 30, 2015 at 6:22 PM, David Kraeutmann wrote:

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

...

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 wrote:

...

Have you checked how changing the optimization level affects build

times?

...

Are you using template Haskell?

On Tuesday, September 29, 2015, aditya siram 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

...

...

...

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

On Thu, Oct 1, 2015 at 12:25 AM, aditya siram wrote: library. the

...

...

...

per instance OVERLAPPING pragmas.

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

Thanks! -deech

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