Richard Huxton wrote:
Dave Cramer wrote:
On 18-Nov-05, at 1:07 AM, Luke Lonergan wrote:
Postgres + Any x86 CPU from 2.4GHz up to Opteron 280 is CPU bound
after
110MB/s of I/O. This is true of Postgres 7.4, 8.0 and 8.1.
A $1,000 system with one CPU and two SATA disks in a software RAID0
will
perform exactly the same as a $80,000 system with 8 dual core CPUs
and the
world's best SCSI RAID hardware on a large database for decision
support
(what the poster asked about).
Now there's an interesting line drawn in the sand. I presume you
have numbers to back this up ?
This should draw some interesting posts.
That's interesting, as I occasionally see more than 110MB/s of
postgresql IO on our system. I'm using a 32KB block size, which has
been a huge win in performance for our usage patterns. 300GB database
with a lot of turnover. A vacuum analyze now takes about 3 hours, which
is much shorter than before. Postgresql 8.1, dual opteron, 8GB memory,
Linux 2.6.11, FC drives.
-- Alan
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