[Haskell-cafe] SMP parallelism increasing GC time dramatically

Johan Tibell johan.tibell at gmail.com
Wed Oct 5 23:43:40 CEST 2011

On Wed, Oct 5, 2011 at 2:37 PM, Tom Thorne <thomas.thorne21 at gmail.com>wrote:

> The only problem is that now I am getting random occasional segmentation
> faults that I was not been getting before, and once got a message saying:
> Main: schedule: re-entered unsafely
> Perhaps a 'foreign import unsafe' should be 'safe'?
> I think this may be something to do with creating a lot of sparks though,
> since this occurs whether I have the parallel GC on or not.

Unless you (or some library you're using) is doing what the error message
says then you should file a GHC bug here:


-- Johan
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