| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Achilleas Mantzios <a(dot)mantzios(at)cloud(dot)gatewaynet(dot)com>, pgsql-performance(at)lists(dot)postgresql(dot)org |
| Subject: | Re: pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit |
| Date: | 2023-09-15 23:08:55 |
| Message-ID: | CA+hUKGLUL4AxtUn66SVZ5nZxorFPUq+Jo5yqSkGP9sogbSAdgA@mail.gmail.com |
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| Lists: | pgsql-performance |
On Sat, Sep 16, 2023 at 7:42 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Sadly, this proves very little about Linux's behavior. glibc's idea
> of en_US involves some very complicated multi-pass sort rules.
> AFAICT from the FreeBSD sort(1) man page, FreeBSD defines en_US
> as "same as C except case-insensitive", whereas I'm pretty sure
> that underscores and other punctuation are nearly ignored in
> glibc's interpretation; they'll only be taken into account if the
> alphanumeric parts of the strings sort equal.
Achilleas didn't mention the glibc version, but based on the kernel
vintage mentioned I guess that must be the "old" (pre 2.28) glibc
sorting. In 2.28 they did a big sync-up with ISO 14651, while FreeBSD
follows the UCA, a closely related standard[1]. I think newer
Linux/glibc systems should agree with FreeBSD's libc in more cases
(and also agree with ICU).
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