Re: postgres 9.3 vs. 9.4

Hi Folk,

I am trying to investigate some performance issues which we have with postgres
(a different topic by itself) and tried postgres.9.4beta2, with a hope that it
perform better.

Turned out that 9.4 is 2x slower than 9.3.5 on the same hardware.

Some technical details:

  Host: rhel 6.5 2.6.32-431.23.3.el6.x86_64
  256 GB RAM, 40 cores, Intel(R) Xeon(R) CPU E5-2660 v2 @ 2.20GHz
  2x160GB  PCIe SSD DELL_P320h-MTFDGAL175SAH ( on one 9.3, on an other one 9.4 )

postgres tweaks:


default_statistics_target = 100
wal_writer_delay = 10s
vacuum_cost_delay = 50
synchronous_commit = off

9.3.5:

# /usr/pgsql-9.3/bin/pgbench -r -j 1 -c 1 -T 60

       0.035940        END;


9.4beta2:

        0.957854        END;