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Re: How to improve db performance with $7K?

From: Dave Cramer <pg(at)fastcrypt(dot)com>
To:
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: How to improve db performance with $7K?
Date: 2005-03-29 12:17:05
Message-ID: 42494741.7060806@fastcrypt.com (view raw or flat)
Thread:
Lists: pgsql-performance
Yeah, 35Mb per sec is slow for a raid controller, the 3ware mirrored is
about 50Mb/sec, and striped is about 100

Dave

PFC wrote:

>
>> With hardware tuning, I am sure we can do better than 35Mb per sec. Also
>
>
>     WTF ?
>
>     My Laptop does 19 MB/s (reading <10 KB files, reiser4) !
>
>     A recent desktop 7200rpm IDE drive
> # hdparm -t /dev/hdc1
> /dev/hdc1:
>  Timing buffered disk reads:  148 MB in  3.02 seconds =  49.01 MB/sec
>
> # ll "DragonBall 001.avi"
> -r--r--r--    1 peufeu   users        218M mar  9 20:07 DragonBall 
> 001.avi
>
> # time cat "DragonBall 001.avi" >/dev/null
> real    0m4.162s
> user    0m0.020s
> sys     0m0.510s
>
> (the file was not in the cache)
>     => about 52 MB/s (reiser3.6)
>
>     So, you have a problem with your hardware...
>
> ---------------------------(end of broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings
>
>


-- 
Dave Cramer
http://www.postgresintl.com
519 939 0336
ICQ#14675561

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Subject: Re: How to improve db performance with $7K?

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