On 2010-10-21 06:47, Scott Carey wrote:
> On a wimpy disk, I/O bound for sure. But my disks go 1000MB/sec.
> No query can go fast enough for them. The best I've gotten is
> 800MB/sec, on a wide row (average 800 bytes). Most tables go
> 300MB/sec or so. And with 72GB of RAM, many scans are in-memory
> anyway.
Is it cpu or io bound while doing it?
Can you scan it faster using time cat relation-oid.* > /dev/null
> A single SSD with supercapacitor will go about 500MB/sec by itself
> next spring. I will easily be able to build a system with 2GB/sec
> I/O for under $10k.
What filesystem are you using? Readahead?
Can you try to check the filesystemfragmentation of the table using filefrag?
--
Jesper
