Re: [Gems-users] ruby parameter selection

[Mladen Nikitovic <mladen@xxxxxx>]

correction to my last email: config.h should be default_param.h and 
RUBY_MULTIPLIER should be SIMICS_RUBY_MULTIPLIER.
sorry for the confusion.

/M

Dan Gibson wrote:
> Most of the timing variables are protocol-dependent, unfortunately.
> Grep through MOESI_CMP_directory to discover which variables it uses, 
> and how. I'm no expert on that protocol, so I cannot answer your 
> question directly.
> Regards,
> Dan
>
> Mladen Nikitovic wrote:
>   
> > Hi,
> >
> > I would like to model a pretty simple system with a L1 cache that has an 
> > access time of 1 cycle and an L2 access time of 6 cycles + latency of 
> > the network.
> > I have a problem with setting up these parameters in ruby, especially 
> > the L1 latency.
> > There are many parameters that seem related but it seems some are used 
> > in some protocols, not all.
> > I'm using the MOESI_CMP_directory protocol.
> >
> > I managed to reduce the execution time of the application by changing 
> > the ruby_mutliplier from 2 to 1.
> > The parameters that I'm hesitating about regarding cache latency are the 
> > following:
> > DIRECTORY_CACHE_LATENCY - value: 6 - this latency is used when accessing 
> > the L2, right?
> > ISSUE_LATENCY - value: 2 - what type of issue is this? where is this 
> > issue performed?
> > CACHE_RESPONSE_LATENCY - value: 12 -  Is this L1 or L2? Is it used in 
> > MOESI_CMP_directory protocol?
> > L1_RESPONSE_LATENCY - value: 1 - used in MOESI_CMP_directory?
> > L2_RESPONSE_LATENCY - value: 6 - used in MOESI_CMP_directory?
> >
> > RECYCLE_LATENCY - value: 3 - when is recycling performed?
> > L2_RECYCLE_LATENCY - value: 5 - when is recycling performed?
> >
> > L1_REQUEST_LATENCY - value: 1 - what is the difference between REQUEST 
> > and RESPONSE?
> > L2_REQUEST_LATENCY - value: 6 - what is the difference between REQUEST 
> > and RESPONSE?
> > SEQUENCER_TO_CONTROLLER_LATENCY- value: 4 - should this be 1 or can I 
> > put it to 0?
> > One general question is whether I need to assign 0 to any of these 
> > values to achieve my objective.
> > Hope you have the time to sort out the meaning of these parameters.
> >
> > Regards,
> > Mladen
> >
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> >     
>