storing highly shared data structures

[Christian Maeder]

Bulat Ziganshin wrote:
> CM> My old version is faster, because the version with makeStableName does
> CM> very much GC.
> 
> CM>    MUT   time   27.28s  ( 28.91s elapsed)
> CM>    GC    time  133.98s  (140.08s elapsed)
> 
> try to add infamous "+RTS -A10m" switch ;)

You saved my day, thank you Bulat!

Without that flag:

   MUT   time   24.30s  ( 24.76s elapsed)
   GC    time  131.25s  (140.01s elapsed)
   EXIT  time    0.00s  (  0.00s elapsed)
   Total time  155.55s  (164.77s elapsed)

And with it:

   MUT   time   23.86s  ( 24.86s elapsed)
   GC    time   11.03s  ( 11.68s elapsed)
   EXIT  time    0.00s  (  0.00s elapsed)
   Total time   34.89s  ( 36.54s elapsed)