On Thu, Dec 22, 2022 at 4:19 PM David Rowley <dgrowle...@gmail.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