RE: Speed up transaction completion faster after many relations are accessed in a transaction

On Fri, Apr 5, 2019 at 0:05 AM, Tsunakawa, Takayuki wrote:
> From: Peter Eisentraut [mailto:peter(dot)eisentraut(at)2ndquadrant(dot)com]
> > I can't detect any performance improvement with the patch applied to
> > current master, using the test case from Yoshikazu Imai (2019-03-19).
>
> That's strange... Peter, Imai-san, can you compare your test procedures?

Just for make sure, I described my test procedures in detail.

I install and setup HEAD and patched as follows.

[HEAD(413ccaa)]
(git pull)
./configure --prefix=/usr/local/pgsql-dev --enable-depend
make clean
make

make install

su postgres
export PATH=/usr/local/pgsql-dev/bin:$PATH
initdb -D /var/lib/pgsql/data-dev
vi /var/lib/pgsql/data-dev/postgresql.conf
====
port = 44201
plan_cache_mode = 'auto' or 'force_custom_plan'
max_parallel_workers = 0
max_parallel_workers_per_gather = 0
max_locks_per_transaction = 4096
====
pg_ctl -D /var/lib/pgsql/data-dev start

[HEAD(413ccaa) + patch]
(git pull)
patch -u -p1 < 0002.patch
./configure --prefix=/usr/local/pgsql-locallock --enable-depend
make clean
make

make install

su postgres
export PATH=/usr/local/pgsql-locallock/bin:$PATH
initdb -D /var/lib/pgsql/data-locallock
vi /var/lib/pgsql/data-locallock/postgresql.conf
====
port = 44301
plan_cache_mode = 'auto' or 'force_custom_plan'
max_parallel_workers = 0
max_parallel_workers_per_gather = 0
max_locks_per_transaction = 4096
====
pg_ctl -D /var/lib/pgsql/data-locallock start

And I tested as follows.

(creating partitioned table for port 44201)
(creating partitioned table for port 44301)
(creating select4096.sql)
for i in `seq 1 5`; do
pgbench -n -f select4096.sql -T 60 -M prepared -p 44201 | grep including;
pgbench -n -f select4096.sql -T 60 -M prepared -p 44301 | grep including;
done
tps = 8146.039546 (including connections establishing)
tps = 9021.340872 (including connections establishing)
tps = 8011.186017 (including connections establishing)
tps = 8926.191054 (including connections establishing)
tps = 8006.769690 (including connections establishing)
tps = 9028.716806 (including connections establishing)
tps = 8057.709961 (including connections establishing)
tps = 9017.713714 (including connections establishing)
tps = 7956.332863 (including connections establishing)
tps = 9126.650533 (including connections establishing)

Thanks
--
Yoshikazu Imai