Re: [Gems-users] L2 Miss Profiling

[Nilay Vaish <nilay@xxxxxxxxxxx>]

On Thu, 8 Apr 2010, Dan Gibson wrote:

> It is not out of the question that there might be profiling problems with
> MESI_CMP_filter_directory. However, lets cover the basics first:
> - What are your cache sizes?
L2  cache_size_Kbytes: 1024
L1I cache_size_Kbytes: 64
L1D cache_size_Kbytes: 64

> - What is the workload?
I am simulating the Ocean application with 4 threads. It makes use of a 
258 X 258 grid of integers.
> - For how long are you running the simulation?
The simulation runs for about 18 minutes.

> Regards,
> Dan
>
> On Thu, Apr 8, 2010 at 10:52 AM, Nilay Vaish <nilay@xxxxxxxxxxx> wrote:
>
> > Hi
> >
> > I am using GEMS for studying effect of L2 cache parameters on performance
> > of CMPs. Right now I am using the protocol MESI_CMP_filter_directory. The L2
> > misses obtained as output is suspiciously close to the sum of L1D and L1I
> > cache misses. I am quoting the misses obtained for a 16 processor machine.
> >
> > L1D_cache cache stats:
> >  L1D_cache_total_misses: 1334256
> >  L1D_cache_total_demand_misses: 1334256
> >
> > L1I_cache cache stats:
> >  L1I_cache_total_misses: 2010
> >  L1I_cache_total_demand_misses: 2010
> >
> > L2_cache cache stats:
> >  L2_cache_total_misses: 1336262
> >  L2_cache_total_demand_misses: 1336262
> >
> > Has anyone used GEMS for profiling L2 misses? What might be going on wrong
> > here?
> >
> > --
> > Nilay
> >
> > _______________________________________________
> > Gems-users mailing list
> > Gems-users@xxxxxxxxxxx
> > https://lists.cs.wisc.edu/mailman/listinfo/gems-users
> > Use Google to search the GEMS Users mailing list by adding "site:
> > https://lists.cs.wisc.edu/archive/gems-users/"; to your search.
>
> --
> http://www.cs.wisc.edu/~gibson [esc]:wq!
Thanks
Nilay