On Mon, Jun 18, 2012 at 5:04 PM, Antoine Pitrou <solip...@pitrou.net> wrote:
> On Mon, 18 Jun 2012 15:28:24 +0100 > Mark Shannon <m...@hotpy.org> wrote: > > > > But do they? The results of benchmarking would seem to suggest (at least > > on my test machine) that overly-sparse dicts are slower. > > Possibly due to increased cache misses. > > Or, at least, they are not faster. See the synthetic experiments in > http://bugs.python.org/issue10408 > > That said, Raymond might have witnessed different results at the time. > Hardware evolves quickly and the parameters change (memory latency > today is at least 50+ CPU cycles, which is quite a lot of wasted work on > a pipelined superscalar CPU). > > Regards > > Antoine. > > More like 200-500 CPU cycles on modern CPUs.
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