[Python-Dev] Python parser performance optimizations

[Bernardo Sulzbach]

On 05/29/2016 10:53 PM, Steven D'Aprano wrote:
> On Thu, May 26, 2016 at 10:19:05AM +0000, Artyom Skrobov wrote:
> [...]
>> The motivation for this patch was to enable a memory footprint
>> optimization, discussed at http://bugs.python.org/issue26415 My
>> proposed optimization reduces the memory footprint by up to 30% on the
>> standard benchmarks, and by 200% on a degenerate case which sparked
>> the discussion. The run time stays unaffected by this optimization.
>
> That can't be right. How can you reduce memory usage by more than one
> hundred percent? That would mean you have saved more memory than was
> originally used and are now using a negative amount of memory.
>

It is not. It would be nice to have the values that were used to 
calculate these percentages.