Re: [Gems-users] Gems cache timing model

[Dan Gibson <degibson@xxxxxxxx>]

1. You can grep through a protocol's .sm files to find out what latencies it uses.
2. You can never trust a comparison of only one run. When simulating multiprocessors, small timing perturbations can cause threads to take a different path. This is why we typically use many (~10) runs per configuration to achieve a reasonable 95% confidence interval. See Alameldeen and Wood: http://www.cs.wisc.edu/multifacet/papers/hpca03_variability.pdf

Regards,
Dan

On Tue, Apr 20, 2010 at 1:03 PM, Mark Samuelson <msamuelson@xxxxxxxx> wrote:

We are using MOESI_CMP_directory.  And yes, we checked to make sure everything else was the same.

Philip Garcia wrote:

what protocol are you using, I know many of these parameters aren't used under some protocols, and even if they are, increasing them shouldn't reduce runtime, are you sure you're running on the same checkpoint, and that nothing else changed?

Phil
On Apr 20, 2010, at 12:37 PM, Mark Samuelson wrote:

We are running a simple program and found increasing the L2 request and response latencies improved both the cache miss rate and the overall runtime.

Does anyone know what the difference between the request, response, and tag latencies are?

Mark
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