| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: appendBinaryStringInfo stuff |
| Date: | 2022-12-22 12:20:37 |
| Message-ID: | CAFBsxsFYqFamtTPXRPz7+qtLV2aDaCGywa18muyad4kgmRojLQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Dec 22, 2022 at 4:19 PM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
>
> Test 1 (from earlier)
>
> master + escape_json using appendStringInfoCharMacro
> $ pgbench -n -T 60 -f bench.sql -M prepared postgres | grep latency
> latency average = 1.807 ms
> latency average = 1.800 ms
> latency average = 1.812 ms (~4.8% faster than master)
> 23.05% postgres [.] pg_utf_mblen
I get about 20% improvement by adding an ascii fast path in
pg_mbstrlen_with_len, which I think would work with all encodings we
support:
@@ -1064,7 +1064,12 @@ pg_mbstrlen_with_len(const char *mbstr, int limit)
while (limit > 0 && *mbstr)
{
- int l = pg_mblen(mbstr);
+ int l;
+
+ if (!IS_HIGHBIT_SET(*mbstr))
+ l = 1;
+ else
+ l = pg_mblen(mbstr);
--
John Naylor
EDB: http://www.enterprisedb.com
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