[Haskell-cafe] Re: Optimizing a high-traffic network architecture

Joel Reymont joelr1 at gmail.com
Thu Jan 5 05:59:26 EST 2006

My apologies if this has been described somewhere but what is MUT time?

Also, isn't 30% GC a bit high? This is something that totally  
surprised me when I first saw it as my program was spending 60-70% on  

Is there a good low % number that should be used as a benchmark?

	Thanks, Joel

On Jan 5, 2006, at 10:01 AM, Simon Marlow wrote:

>   INIT  time    0.00s  (  0.00s elapsed)
>   MUT   time    2.48s  (  2.58s elapsed)
>   GC    time    1.08s  (  1.08s elapsed)
>   EXIT  time    0.00s  (  0.00s elapsed)
>   Total time    3.56s  (  3.65s elapsed)
>   %GC time      30.3%  (29.5% elapsed)
>   Alloc rate    68,007,748 bytes per MUT second
>   Productivity  69.7% of total user, 67.9% of total elapsed
> My hypothesis is that when we give each thread its own memory  
> block, all the thread stacks occupy the same cache lines and we end  
> up with a lot more cache misses (notice it's the MUT time that  
> increased, not the GC time).


More information about the Haskell-Cafe mailing list