| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | Zoltan Boszormenyi <zb(at)cybertec(dot)at> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 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 19:28:19 |
| Message-ID: | 46C353D3.1090301@enterprisedb.com |
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| Lists: | pgsql-hackers |
Zoltan Boszormenyi wrote:
> Tom Lane írta:
>> It's hard to see how anyone could be doing 6K xacts/sec unless most are
>> read-only.
>
> 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.
6k xacts / s is five *hundred* million transactions, not five million...
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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