Re: [Gems-users] Garnet Network parameters

[Edward Lee <edwl202@xxxxxxxxx>]

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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>
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