| From: | Zoltan Boszormenyi <zb(at)cybertec(dot)at> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: XID wraparound and busy databases |
| Date: | 2007-08-15 19:23:51 |
| Message-ID: | 46C352C7.3090806@cybertec.at |
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| Lists: | pgsql-hackers |
Tom Lane írta:
> It's hard to see how anyone could be doing 6K xacts/sec unless most are
> read-only.
>
> regards, tom lane
>
In a recent stress test with our PostgreSQL-based cluster between two
machines
3 million transaction were performed with "pgbench -c 150 -t 20000 -s 200"
in about _ten hours_. The primary machine (desktop-level machine for
development)
used a real disk, the secondary used tmpfs as PGDATA. Say whatever you want
about my disk lying about flush, its 75MB/sec transfer rate transfer
rate is real.
So 5 million "real" transaction in 24 hours is not unrealistic.
--
----------------------------------
Zoltán Böszörményi
Cybertec Geschwinde & Schönig GmbH
http://www.postgresql.at/
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