On 05/07/2014 01:36 PM, Jeff Janes wrote:
> On Wed, May 7, 2014 at 11:04 AM, Josh Berkus <josh@agliodbs.com> wrote:
>> Unfortunately nobody has the time/resources to do the kind of testing
>> required for a new recommendation for shared_buffers.
> I think it is worse than that. I don't think we know what such testing
> would even look like. SSD? BBU? max_connections=20000 with 256 cores?
> pgbench -N? capture and replay of Amazon's workload?
>
> If we could spell out/agree upon what kind of testing we would find
> convincing, that would probably go a long way to getting some people to
> work on carrying out the tests. Unless the conclusion was "please have 3TB
> or RAM and a 50 disk RAID", then there might be few takers.
Well, step #1 would be writing some easy-to-run benchmarks which carry
out selected workloads and measure response times. The minimum starting
set would include one OLTP/Web benchmark, and one DW benchmark.
I'm not talking about the software to run the workload; we have that, in
several varieties. I'm talking about the actual database generator and
queries to run. That's the hard work.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com