Re: [Gems-users] onchip directory in MOESI_CMP_directory protocol

[Mike Marty <mikem@xxxxxxxxxxx>]

The network topology is independent of the messages a protocol uses.  The
PT_TO_PT and FILE_SPECIFIED are appropriate for this CMP protocol.

To see the _network_ latencies, set g_PRINT_TOPOLOGY to true in
$GEMS/ruby/config/rubyconfig.defaults.  Then in the Ruby stats, you will
see lines like the following to give you the minimum latency between
components:

  L1Cache-0 -> L2Cache-0 net_lat: 5

PT_TO_PT creates a simple network and uses the NETWORK_LINK_LATENCY and
ON_CHIP_LINK_LATENCY.

FILE_SPECIFIED networks use the files in
$GEMS/ruby/network/simple/NetworkFiles.  You can create an arbitrary
topology with link latencies and bandwidths specified.  The set of network
files is chosen based on the g_CACHE_DESIGN parameter.

--Mike


> Hi Mike,
>   Thanks for the immediate response. How to calculate
> the network latency between an L1 cache to the onchip
> directory? Will these transfers (say an unblock
> message) happen on the regular network defined by
> Topology?
>
> thank u
> --n
>
> --- Mike Marty <mikem@xxxxxxxxxxx> wrote:
>
> > MOESI_CMP_directory assumes shadowed L1 tags for
> > protocol logic, but
> > completely abstracts away the implementation details
> > of keeping a shadowed
> > copy by using a "perfect directory" structure for
> > implementation in SLICC.
> >
> >
> > > hi,
> > >   I am using MOESI_CMP_directory protocol and I
> > would
> > > like to know whether it employs distributed (one
> > per
> > > L2 bank) or centralized on chip directory. If it
> > is
> > > distributed how L1 tags are tracked?
> > >
> > > --n
> > >
> > >
> > >
> > >
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