storing highly shared data structures

[Simon Marlow]

Christian Maeder wrote:
> 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)

The real problem seems to be that minor GCs are taking too long.  Having 
said that, you can usually reduce GC overhead with large -A or -H options.

Cheers,
	Simon