Re: [MMTests] Sysbench read-only on ext3

[Mel Gorman]

On Tue, Jul 24, 2012 at 04:29:29AM +0200, Mike Galbraith wrote:
> On Mon, 2012-07-23 at 22:13 +0100, Mel Gorman wrote:
> 
> > The backing database was postgres.
> 
> FWIW, that wouldn't have been my choice.  I don't know if it still does,
> but it used to use userland spinlocks to achieve scalability. 

The tests used to support mysql but the code bit-rotted and eventually
got deleted. I'm not going to get into a mysql vs postgres discussion on
which is better :O

Were you thinking of mysql or something else as an alternative?
Completely different test?

> Turning
> your CPUs into space heaters to combat concurrency issues makes a pretty
> flat graph, but probably doesn't test kernels as well as something that
> did not do that.
> 

I did not check the source, but even if it is true then your comments only
applies to testing scalability of locking. If someone really cares to check,
the postgres version was 9.0.4. However, even if they are using user-space
locking, the test is still useful for looking at the IO performance,
page reclaim decisions and so on.

-- 
Mel Gorman
SUSE Labs
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