Re: Perform COPY FROM encoding conversions in larger chunks

I wrote:

> I went ahead and rebased these.

It looks like FreeBSD doesn't like this for some reason.

I also wanted to see if this patch set had any performance effect, with and
without changing how UTF-8 is validated, using the blackhole am from
https://github.com/michaelpq/pg_plugins/tree/master/blackhole_am.

create extension blackhole_am;
create table blackhole_tab (a text) using blackhole_am ;
time ./inst/bin/psql -c "copy blackhole_tab from '/path/to/test-copy.txt'"

....where copy-test.txt is made by

for i in {1..100}; do cat UTF-8-Sampler.htm >> test-copy.txt ; done;

On Linux x86-64, gcc 8.4, I get these numbers (minimum of five runs):

master:
109ms

v6 do encoding in larger chunks:
109ms

v7 utf8 SIMD:
98ms

--
John Naylor
EDB: http://www.enterprisedb.com