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Re: Inserting 8MB bytea: just 25% of disk perf used?

From: Ivan Voras <ivoras(at)freebsd(dot)org>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Inserting 8MB bytea: just 25% of disk perf used?
Date: 2010-01-19 15:36:59
Message-ID: hj4jil$rg2$2@ger.gmane.org (view raw or flat)
Thread:
Lists: pgsql-performance
On 01/19/10 14:36, fkater(at)googlemail(dot)com wrote:
> Ivan Voras:
>
>> [I just skimmed this thread - did you increase the number of WAL logs to
>> something very large, like 128?]
>
> Yes, I tried even more.
>
> I will be writing data quite constantly in the real scenario
> later. So I wonder if increasing WAL logs will have a
> positive effect or not: AFAIK when I increase it, the
> duration after the max is hit will be longer then (which is
> not acceptable in my case).
>
> Could anyone confirm if I got it right?

It seems so - if you are writing constantly then you will probably get 
lower but more long-term-stable performance from a smaller number of WAL 
logs.


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