Long compilation times when profiling a large CAF

Simon Marlow marlowsd at gmail.com
Wed Aug 22 13:16:46 CEST 2012

On 21/08/2012 19:14, Conal Elliott wrote:
> I'm looking for help with crazy-long compile times when using GHC with
> profiling. A source file at work has a single 10k line top-level
> definition, which is a CAF. With -prof auto-all or an explicit SCC,
> compilation runs for 8 hours on a fast machine with the heap growing to
> 13GB before being killed. Without profiling, it compiles in a few minutes.
> The big CAFs are auto-generated and not of my making, so I'm hoping for
> a solution other than "stop making big CAFs".

We could take a look.  Can you make a self-contained example that 
demonstrates the problem?


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