| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Incorrect CHUNKHDRSZ in nodeAgg.c |
| Date: | 2025-01-08 20:50:10 |
| Message-ID: | 3d9b8f7609039c5775cc8272f09054faea794c66.camel@j-davis.com |
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| Lists: | pgsql-hackers |
On Mon, 2025-01-06 at 12:34 -0800, Jeff Davis wrote:
> If we separate out 4, we can use the Bump allocator for 2 & 3.
Attached POC patch, which reduces memory usage by ~15% for a simple
distinct query on an integer key. Performance is the same or perhaps a
hair faster.
It's not many lines of code, but the surrounding code might benefit
from some refactoring which would make it a bit simpler.
Regards,
Jeff Davis
| Attachment | Content-Type | Size |
|---|---|---|
| v1-0001-HashAgg-use-Bump-context-for-hash-table-entries.patch | text/x-patch | 5.5 KB |
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