Performance numbers?

[Ulf Lilleengen]

On Fri, Jan 30, 2009 at 10:40:46AM -0600, Eric Anderson wrote:
> Hi GEOMers!
> 
> Does anyone have any benchmarks or numbers relating to GEOM performance?
> 
> I tried doing some on my own, but I didn't get very satisfactory  
> results, so I'm curious what others have seen or used.
> 
> My hardware is a Core 2 Quad, with 4GB of ram.
> 
> First, I made an mdconfig'ed malloc backed 'disk' of 1.5GB.  Then, I  
> tried running such tools as rawio, and diskinfo.  rawio fails with  
> input/output errors, and diskinfo wants a larger device to give the  
> full stats.  I ended up using purely dd since that worked.   
> Interestingly enough, dd'ing to the malloc device results in about  
> 1000 operations per second, regardless of a blocksize of 512bytes or  
> 1MB.
> 
> Do you all expect this 1000 operations per second to be limited by the  
> mdconfig'ed device, GEOM, both, all, none, ??  I'm looking for  
> pointers here mostly.  I really would like to see how many operations  
> (512byte really) the GEOM infrastructure can do on a particular piece  
> of hardware, so if there is a simpler way to do this test, give me a  
> hint.  :)
> 
Maybe try dtrace to find bottlenecks etc?

-- 
Ulf Lilleengen