Re: [Gems-users] Garnet Network parameters

["Arseniy Vitkovskiy" <arseniy.vitkovskiy@xxxxxxxxx>]

Hi Niket,

I have similar problem. I performed the linkBuffer checking and now I
need to reschedule the link to the next cycle. How should I do that?

Kind regards,
Arseniy.
 

> -----Original Message-----
> From: gems-users-bounces@xxxxxxxxxxx [mailto:gems-users-
> bounces@xxxxxxxxxxx] On Behalf Of Niket Agarwal
> Sent: Thursday, October 15, 2009 6:58 AM
> To: Gems Users
> Subject: Re: [Gems-users] Garnet Network parameters
> 
> You should check if the linkBuffer is empty or has a flit which will
> leave this cycle. You are checking the link_srcQueue!
> 
> If neither of the condition is true, which means that no flit is being
> picked up form the link_srcQueue, I think you would also need to
> reschedule the link the next cycle.
> 
> -Niket
> 
> On Oct 14, 2009, at 11:16 PM, Edward Lee wrote:
> 
> > Thanks for the tip. I followed the guidelines as suggested in the
link
> > and came up with the following. Anything I am missing?
> >
> > void NetworkLink_d::wakeup()
> > {
> >    if(link_srcQueue->isEmpty())
> >    {
> >        flit_d *t_flit = link_srcQueue->getTopFlit();
> >        t_flit->set_time(g_eventQueue_ptr->getTime() + m_latency);
> >        linkBuffer->insert(t_flit);
> >        g_eventQueue_ptr->scheduleEvent(link_consumer, m_latency);
> >        m_link_utilized++;
> >        m_vc_load[t_flit->get_vc()]++;
> >    }
> >    else
> >    {
> >        flit_d *t_flit = link_srcQueue->getTopFlit();
> >        if((t_flit->get_time()) <= (g_eventQueue_ptr->getTime()))
> >        {
> >            t_flit->set_time(g_eventQueue_ptr->getTime() +
m_latency);
> >            linkBuffer->insert(t_flit);
> >            g_eventQueue_ptr->scheduleEvent(link_consumer,
m_latency);
> >            m_link_utilized++;
> >            m_vc_load[t_flit->get_vc()]++;
> >        }
> >    }
> > }
> >
> > -- Ed
> >
> > On Wed, Oct 14, 2009 at 7:52 PM, Niket Agarwal
> > <niketa@xxxxxxxxxxxxx> wrote:
> >> You can model lower bandwidth links as you said. Please follow
> >> https://lists.cs.wisc.edu/archive/gems-users/2009-April/
> >> msg00076.shtml
> >>
> >> -Niket
> >>
> >> Edward Lee wrote:
> >>> Hi all,
> >>>
> >>> I would like to verify the meaning of some simulation parameters
to
> >>> come up with realistic network parameters.
> >>> I am running a 2GHz serengeti machine with 16 processors using
> >>> MOESI_SMP_directory protocol to simulate a 16-core CMP with
private
> >>> caches.
> >>>
> >>> Here are some configuration values:
> >>>
> >>> SIMICS_RUBY_MULTIPLIER: 4 --> does this mean Ruby clock is 2GHz/4
> >>> = 0.5GHz?
> >>>
> >>> network is 4x4 MESH via GARNET
> >>> g_FLIT_SIZE: 16
> >>>
> >>> a snapshot of network parameters:
> >>>
> >>> ....
> >>>
> >>> ext_node:L1Cache:0 int_node:0 link_latency:1
> >>> ext_node:Directory:0 int_node:0 link_latency:4
> >>> int_node:0 int_node:1 link_latency:8 link_weight:1
> >>>
> >>> ...
> >>>
> >>> So, since FLIT_SIZE refers to bytes/cycle and it is suggested to
> >>> tune
> >>> the latencies for lower bandwidths. Would it be accurate to make
the
> >>> following assumtions?
> >>>
> >>> 16 bytes/cycle * 0.5 Ghz / link_latency = link_bandwidth
> >>>
> >>> Accordingly,
> >>>
> >>> bandwidth to caches 8GB/s, bandwidth to memory/directory 2 GB/s,
> >>> bandwidth between cores is 1GB/s
> >>>
> >>> Thanks for any input in advance,
> >>>
> >>> Ed
> >>> _______________________________________________
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