Re: postgresql 8.3 tps rate

On Thu, Jan 22, 2009 at 1:27 PM, Ibrahim Harrani
<ibrahim(dot)harrani(at)gmail(dot)com> wrote:
> Version 1.93d ------Sequential Output------ --Sequential Input- --Random-
> Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
> myserver 300M 391 97 9619 1 8537 2 673 99 +++++ +++ 1196 16
> Latency 211ms 388ms 325ms 27652us 722us 6720ms
> Version 1.93d ------Sequential Create------ --------Random Create--------
> myserver -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> 16 9004 25 +++++ +++ +++++ +++ 8246 20 +++++ +++ +++++ +++
> Latency 592ms 208us 102us 673ms 179us 100us

You should be testing bonnie with a file size that is at least double
the amount of memory in your machine - in this case, 4GB files, not
300MB files.

> When I compare my bonnie++ result with the one at
> http://www.westnet.com/~gsmith/content/postgresql/pg-disktesting.htm,
> It seems that there is something wrong with the disks!?

Yes, your machine appears to be very slow. You should be able to
write in the order of 30-50MB/s+ and read in the order of 40-80MB/s+.
Random IO should be in the 200 tps range for a 7200rpm SATA RAID1.

-Dave