| From: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Gather performance analysis |
| Date: | 2021-09-24 20:44:32 |
| Message-ID: | abe1f1a7-82aa-873e-fb81-1ea7e2559d45@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 9/24/21 1:43 AM, Robert Haas wrote:
> On Thu, Sep 23, 2021 at 5:36 PM Tomas Vondra
> <tomas(dot)vondra(at)enterprisedb(dot)com> wrote:
>> (c) This can't explain the slowdown for cases without any Gather nodes
>> (and it's ~17%, so unlikely due to binary layout).
>
> Yeah, but none of the modified code would even execute in those cases,
> so it's either binary layout, something wrong in your test
> environment, or gremlins.
>
I'm not going to the office all that often these days, but I think I'm
sure I'd notice a bunch of gremlins running around ... so it's probably
the binary layout thing. But still, strange.
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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