[Gems-users] Re: configuration of CMP in GEMS

[Weihang Jiang <weihang.jiang@xxxxxxxxx>]

More about CMP configuration

If I only simulate a single CMP, can I ignore 
"g_NETWORK_TOPOLOGY: FILE_SPECIFIED
NUMBER_OF_VIRTUAL_NETWORKS: 5" ?

I am still not sure about TIMING parameters:

Your "target system parameters"  and my guessing

interconnect latency 2ns        =>    ON_CHIP_LINK_LATENCY: 2

memory/dir controller 6ns       =>  ???

L1 2ns                                  =>     L1_BANK_LATENCY_MINUS_1: 1
                                                 &  L1_REQUEST_LATENCY: 1  
       
L2 7ns                                  =>     L2_BANK_LATENCY_MINUS_2: 5  
                                                  & L2_REQUEST_LATENCY: 5

latency to controller 20 ns      =>   ???

DRAM latency 80ns               =>     MEMORY_LATENCY: 80

Do we need to changes other timing parameters?



following is all the timing parameters in rubyconfig.defaults

// TIMING PARAMETERS
NULL_LATENCY: 1
ISSUE_LATENCY: 2
CACHE_RESPONSE_LATENCY_MINUS_1: 11
MEMORY_LATENCY: 80
DIRECTORY_LATENCY: 80
NETWORK_LINK_LATENCY: 14
COPY_HEAD_LATENCY: 4
ON_CHIP_LINK_LATENCY: 1
RECYCLE_LATENCY: 10
L2_RECYCLE_LATENCY: 5
TIMER_LATENCY: 10000
// for a 3 cycle L1 cache
L1_BANK_LATENCY_MINUS_1: 2
// for a 6 cycle L2 cache bank
L2_BANK_LATENCY_MINUS_2: 4
TBE_RESPONSE_LATENCY: 1
PERIODIC_TIMER_WAKEUPS: true

// constants used by CMP protocols
// cache bank access times
L1_REQUEST_LATENCY: 2
L2_REQUEST_LATENCY: 4
// Allows on a single accesses to a multi-cycle L2 bank.
// Ensures the cache array is only accessed once for every L2_REQUEST_LATENCY
// number of cycles.  However the TBE table can be accessed in parallel.
SINGLE_ACCESS_L2_BANKS: true

// Ruby cycles between when a sequencer issues a request and it arrives at
// the L1 cache controller
SEQUENCER_TO_CONTROLLER_LATENCY: 4


















On Sat, 5 Mar 2005 23:34:12 -0600, Weihang Jiang
<weihang.jiang@xxxxxxxxx> wrote:
> Thank you so much :)
> 
> 
> On Sat, 5 Mar 2005 23:29:36 -0600 (CST), Mike Marty <mikem@xxxxxxxxxxx> wrote:
> > DirectoryCMP in my HPCA paper used the MOESI_CMP_directory SLICC protocol
> >
> > Make the following changes to rubyconfig.defaults:
> >
> > g_NETWORK_TOPOLOGY: FILE_SPECIFIED
> > NUMBER_OF_VIRTUAL_NETWORKS: 5
> >
> > In Simics, the following parameters must be set for a 4 CMP, 4 procs/chip
> > system (total 16 processors)
> >
> > ruby0.setparam g_endpoint_bandwidth 1000
> > ruby0.setparam g_PROCS_PER_CHIP 4
> > ruby0.setparam g_NUM_PROCESSORS 16
> >
> > I think this should work.
> >
> > --Mike
> >
> >
> > > Dear Mike,
> > >    I am trying to configure a single-CMP system in GEMS/SIMICS. But I
> > > am not sure whether I have configured all the parameters listed in
> > > file rubyconfig.defaults correctly.
> > >    I just noticed that you had a M-CMP setup in your HPCA05
> > > paper,which is close to the system I want. If you still keep the
> > > configuration file, could you please help me?
> > >    TIA
> > > --
> > > Weihang Jiang
> > >
> >
> 
> --
> Weihang Jiang
> 


-- 
Weihang Jiang