| From: | Zoltan Boszormenyi <zb(at)cybertec(dot)at> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| 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 19:35:45 |
| Message-ID: | 46C35591.7000204@cybertec.at |
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| Lists: | pgsql-hackers |
Heikki Linnakangas írta:
> 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...
>
Blush. :-) You're right. However a single machine with ramdisk is able
to do that.
--
----------------------------------
Zoltán Böszörményi
Cybertec Geschwinde & Schönig GmbH
http://www.postgresql.at/
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