| From: | Melanie Plageman <melanieplageman(at)gmail(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | Tomas Vondra <tomas(at)vondra(dot)me>, Nazir Bilal Yavuz <byavuz81(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Andres Freund <andres(at)anarazel(dot)de>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: BitmapHeapScan streaming read user and prelim refactoring |
| Date: | 2025-03-10 22:11:52 |
| Message-ID: | CAAKRu_Zv08Cic=qdCfzrQabpEXGrd9Z9UOW5svEVkCM6=FXA9g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Mar 10, 2025 at 3:06 PM Melanie Plageman
<melanieplageman(at)gmail(dot)com> wrote:
>
> I ran some experiments on master with datasets and access patterns
> derived from Tomas' original bitmap heap scan benchmarking scripts to
> try and identify a good default effective IO concurrency value on
> master.
I've attached one more set of charts for cloud storage that includes
effective_io_concurrency 0 (no prefetching) so that you can see that 0
is actually better than the current default of 1.
- Melanie
| Attachment | Content-Type | Size |
|---|---|---|
| eic1_drilldown.png | image/png | 847.4 KB |
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