Hello!
I wanted reproduce the results using files attached by Shinya Kato and Ayoub Kazar. I installed a postgres compiled from master, and then I installed a postgres built from master plus Nazir Bilal Yavuz's v3 patches applied.
The master+v3patches postgres naturally performed better on copying into the database: anywhere from 11% better for the t.csv file produced by Shinyo's test.sql, to 35% better copying in the t_4096_none.csv file created by Ayoub Kazar's simd-copy-from-bench.sql.
But here's where it gets weird. The two files created by Ayoub Kazar's simd-copy-from-bench.sql that are supposed to be slower, t_4096_escape.txt, and t_4096_quote.csv, actually ran faster on my machine, by 11% and 5% respectively.
This seems impossible.
A few things I should note:
I timed the commands using the Unix time command, like so:
time psql -X -U mwood -h localhost -d postgres -c '\copy t from /tmp/t_4096_escape.txt'
For each file, I timed the copy 6 times and took the average.
This was done on my work Linux machine while also running Chrome and an Open Office spreadsheet; not a dedicated machine only running postgres.
