Auto-scaling will 'never' perform better than fixed one. At best perform 
equal I guess (e.g. compare std::vector to normal arrays)

On Thursday, May 8, 2014 5:42:35 PM UTC+2, Ben Noordhuis wrote:
>
> On Thu, May 8, 2014 at 10:26 AM, Kees k <[email protected]<javascript:>> 
> wrote: 
> > Why the pool size is 4; is it a pragmatic choice? 
>
> More or less.  The actual number is fairly arbitrary but the reason 
> it's fixed is that I couldn't make an auto-scaling thread pool always 
> perform better than a fixed one.  I've tried several approaches but 
> they all regress some of the benchmarks. 
>

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