On Fri, May 1, 2015 at 9:16 AM, Susan K. McClure <smcclure@rice.edu> wrote:
Running postgresql 9-4 on REHL 7 system. I am trying to speed up pg_dump and pg_restore by
using a postgresql.conf with various performance options set, and the --jobs option to force multiple
streams. But various tests, with various "--jobs=" numbers only achieve at most a 1 minute improvement
in elapsed time versus doing pg_dump or pg_restore with no "--jobs" option and no postgresql.conf with performance
options. Am I missing some key option(s) to improve things??
The DB in question is ~25GB. The processor has 24 Cpus, 12 cores
I have tried with "--jobs = 8, 12, and 20" with little or no discernible improvements.
So have you tried 2 jobs first? I'd see how 1, 2, 3, 4 etc work. See if 2 is faster than 1, then 3 faster than 2 etc.
Most of the time, unless you've got a really fast IO subsystem increasing the --jobs doesn't make a big difference as a lot of the work is sequential. Also on restores I think the extra jobs part only kicks in for index builds.
