On 5/10/22 10:31 PM, David Rowley wrote:
On Wed, 11 May 2022 at 14:02, Bruce Momjian <br...@momjian.us> wrote:On Wed, May 11, 2022 at 12:39:41PM +1200, David Rowley wrote:I think the sort improvements done in v15 are worth a mention under General Performance. The commits for this were 91e9e89dc, 40af10b57 and 697492434. I've been running a few benchmarks between v14 and v15 over the past few days and a fairly average case speedup is about 25%. but there are cases where I've seen up to 400%. I think the increase is to an extent that we maybe should have considered making tweaks in cost_tuplesort(). I saw some plans that ran in about 60% of the time by disabling Hash Agg and allowing Sort / Group Agg to do the work.Good point. Do you have any suggested text? I can't really see it clearly based on the commits, except "sorting is faster".If we're going to lump those into a single line then maybe something along the lines of: * Reduce memory consumption and improve performance of sorting tuples in memory I think one line is fine from a user's perspective, but it's slightly harder to know the order of the names in the credits given the 3 independent commits.
I think a brief description following the one-liner would be useful for the release notes.
If you can share a few more details about the benchmarks, we can expand on the one-liner in the release announcement (as this sounds like one of those cool, buzz-y things :)
Jonathan
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