Re: [Gems-users] virtual networks in MSI_MOSI_CMP_directory

[Niket <niketa@xxxxxxxxxxxxx>]

Virtual networks are used by coherence protocols to ensure protocol 
level deadlock avoidance.
Take a look at the protocol files $GEMS/protocols/

If you look at the protocol files for MSI_MOSI_CMP_directory, you will 
notice that they use 5 separate virtual networks (0-4).
Niket

Olya Krachina wrote:
> ok, so now i got ruby to init with 8 virtual networks, but i actually do not
> understand what are virtual networks and where i can find how many of them
> MSI_MOSI_CMP_directory uses. Could someone please explain? 
>
> thanks
>
>
> Quoting Olya Krachina <okrachin@xxxxxxxxxx>:
>
>   
> > Hi,
> > how can i find out how many virtual networks does MSI_MOSI_CMP_directory use?
> > i
> > assume thats what the error is about? this is my output when i try to init
> > ruby.
> > Or what is the problem here? 
> > One thing though is that I haven't changed hierarchical switch to PT_TO_PT
> > or
> > FILE_SPECIFIED as suggested on the wikipage for this protocol, and number of
> > virtual networks right now is 4 in rubyconfig.defaults.
> >
> > simics> load-module ruby
> > simics> ruby0.setparam g_NUM_PROCESSORS 8
> > simics> ruby0.init
> > Ruby Timing Mode
> > Creating event queue...
> > Creating event queue done
> > Creating system...
> >   Processors: 8
> > failed assertion 'network_num < m_virtual_networks' at fn void
> > SimpleNetwork::checkNetworkAllocation(NodeID, bool, int) in
> > network/simple/SimpleNetwork.C:200
> > failed assertion 'network_num < m_virtual_networks' at fn void
> > SimpleNetwork::checkNetworkAllocation(NodeID, bool, int) in
> > network/simple/SimpleNetwork.C:200
> > At this point you might want to attach a debug to the running and get to the
> > crash site; otherwise press enter to continue
> > PID: 27331
> >
> > ***  Simics getting shaky, switching to 'safe' mode.
> > ***  Simics (main thread) received an abort signal, probably an assertion.
> >
> > when i increased number of virtual networks i get this:
> >
> > simics> ruby0.setparam NUMBER_OF_VIRTUAL_NETWORKS 5
> > simics> ruby0.init
> > Ruby Timing Mode
> > Fatal Error: in fn static void RubyConfig::init() in config/RubyConfig.C:91:
> > g_MEMORY_SIZE_BITS must be zero at initialization.
> > Fatal Error: in fn static void RubyConfig::init() in config/RubyConfig.C:91:
> > g_MEMORY_SIZE_BITS must be zero at initialization.
> > ***  Simics getting shaky, switching to 'safe' mode.
> > ***  Simics (main thread) received an abort signal, probably an assertion.
> >
> > thanks in advance
> >
> >  
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