Обсуждение: pg_basebackup running slow

On Fri, Oct 14, 2016 at 10:21 PM, Samir Magar <samirmagar8@gmail.com> wrote:
> What is the settings for max_wal_sender?
> you can try increasing this parameter to improve backup performance.

max_wal_senders has no influence on the performance of a base backup
taken as a base backup is just sent through one single WAL sender
process. What matters here is the network bandwidth.
--
Michael

Vaze,

* Swapnil Vaze (swapvaze28@gmail.com) wrote:
> We are using postgresql 9.2 on redhat linux instance over openstack cloud.
>
> Database is around 441 GB.
>
> We are using below command to take backup:
>
> pg_basebackup -v -D /pgbackup/$bkupdir -Ft -z -c fast
>
> Backup size created is around 84GB.
>
> However, it is taking almost 10 hr 21 minutes to complete.
>
> Looking for speed improvement?

pg_basebackup is single-threaded and the compression is pretty
CPU-intensive.  You could try reducing the compression level, but that
will make the backups larger, of course.  Also, there's a limit to how
far that will get you- once you get to "no compression", that's just as
fast as pg_basebackup can run.

If you're interested in a backup tool which can operate in parallel, you
might want to look at pgbackrest.

Thanks!

Stephen