On 20/12/2018 18:53, David Rowley wrote
[...]
> Patched:
>
> postgres=# analyze t1;
> Time: 680.833 ms
> Time: 699.976 ms
> Time: 695.608 ms
> Time: 676.007 ms
> Time: 693.487 ms
> Time: 726.982 ms
> Time: 677.835 ms
> Time: 688.426 ms
>
> Master:
>
> postgres=# analyze t1;
> Time: 721.837 ms
> Time: 756.035 ms
> Time: 734.545 ms
> Time: 751.969 ms
> Time: 730.140 ms
> Time: 724.266 ms
> Time: 713.625 ms
>
> (+3.66% avg)
[...]
Looking at the normalized standard deviations, the patched results have
a higher than 5% chance of being better simply by chance. I suspect
that you have made an improvement, but the statistics are not convincing.
I can supply detailed working if you want.
Cheers,
Gavin