Re: [Haskell-cafe] 7.10.2 : Compilation slowdown.

1 Oct 2015

      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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