From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Mariel Cherkassky <mariel.cherkassky@gmail.com>
Cc: pgsql-performance@lists.postgresql.org
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: pg_restore takes more time on creation of rules
Date: Wed, 22 May 2019 17:41:02 +0200
Message-ID: <20190522154102.zpvieebklnvis5u3@development> (raw)
In-Reply-To: <CA+t6e1=OWhBrXhyzQdTTdsobo9x82DaGH6J+euuGSAvLERYzcg@mail.gmail.com>
References: <CA+t6e1=OWhBrXhyzQdTTdsobo9x82DaGH6J+euuGSAvLERYzcg@mail.gmail.com>
On Wed, May 22, 2019 at 06:26:49PM +0300, Mariel Cherkassky wrote:
>Hey,
>I'm trying to restore a cluster (9.2) from 3 binary dumps (pg_dump -Fc).
>Each dump contains only one database.
>The sizes :
>A-10GB
>B-20GB
>C-5GB.
>
>For unclear reason the restore of the third database is taking alot of
>time. It isnt stuck but it continues creating db rules. This database has
>more then 400K rules.
>
What do you mean by "rules"?
>I changed a few postgresql.conf parameters :
>shared_buffers = 2GB
>effective_cache_size = 65GB
>checkpoint_segments =20
>checkpoint_completion_target = 0.9
>maintenance_work_mem = 10GB
>checkpoint_timeout=30min
>work_mem=64MB
>autovacuum = off
>full_page_writes=off
>wal_buffers=50MB
>
>my machine has 31 cpu and 130GB of ram.
>
>Any idea why the restore of the two dbs takes about 15 minutes while the
>third db which is the smallest takes more than 1 hour ? I restore the
>dump with pg_restore with 5 jobs (-j).
>
Well, presumably the third database has complexity in other places,
possibly spending a lot of time on CPU, while the other databases don't
have such issue.
What would help is a CPU profile, e.g. from perf.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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To: pgsql-performance@postgresql.org
Cc: tomas.vondra@2ndquadrant.com, mariel.cherkassky@gmail.com, pgsql-performance@lists.postgresql.org, pgsql-admin@lists.postgresql.org
Subject: Re: pg_restore takes more time on creation of rules
In-Reply-To: <20190522154102.zpvieebklnvis5u3@development>
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