Thank you for the reply Tushar. I will run the experiments and see the
results.
Thanks,
Pavan
On Apr 29, 2012, at 1:57 PM, Tushar Krishna wrote:
You can specify --random_seed=xxx in the command line.
Yes numPacketsSent in networktest.cc is a fine stat to use.
I thought you were estimating this from ruby.stats
Control packets in vnet0 and vnet1 are also converted into flits.
All I was saying is that control packets from vnet 0 and vnet 1 get
converted into 1 flit, while data packets in vnet 2 get converted
into 5 flits.
So if you look at ruby.stats, the number of total packets injected
will be = flits_injected_vnet0 + flits_injected_vnet1 +
(flits_injected_vnet2)/5
- Tushar
On Apr 29, 2012, at 4:43 PM, Pavan Poluri wrote:
Hi Tushar,
Thanks for the quick reply. So if I run the experiment with
different random seeds over a large number of cycles the average
number of packets over all the runs should be
injection_rate*simCycles.
I see networktest.cc calls a function random() to get the random
number. Where do I change the seeds so that random() runs on these
different seeds?
Dividing the number of flits stat in ruby.stats by 5 gives the
total number of packets injected. But I want to know the number of
packets injected by each node. That is why I started using
numPacketsSent in networtest.cc as the indicator for number of
packets sent by a node.
So the control packets inserted into Vnet 0 and Vnet 1 are not
converted into flits and these flits do not count in the total
flits injected stat in ruby.stats?
Thanks for your time.
Thanks,
Pavan
On Sun, Apr 29, 2012 at 1:05 PM, Tushar Krishna
<[email protected]> wrote:
Hi Pavan,
A couple of things to note:
1) 0.01 is an average injection rate. So a node *could* inject more
than 10 packets (but not a lot more).
The implementation is basically a bernoulli trial, where every
cycle you generate a random number and decide to inject or not
based on whether it is less than or greater than the injection rate.
If you run the experiment with different random seeds, (and for
large number of cycles each time), the average should be
(injection_rate * simCycles).
2) Vnet 2 injects 5-flit packets. So you should divide the flits
injected stat from it by 5 to get packets injected.
Let me know if you have more questions.
- Tushar
On Apr 29, 2012, at 3:25 PM, Pavan Poluri wrote:
> Hello,
>
> I am trying to simulate the interconnection network using the
Network_test protocol. My question is on the file networktest.cc
that is responsible for generating and sending the packets. I
understand that if I use --fixed-pkts and --maxpackets options
together I enforce each cpu node to only inject maxpackets number
of packets. So even before the simulation, if simCycles is
sufficiently large I know that each node will inject maxpackets
number of packets. I wanted the number of packets injected by each
node to be random. So I did not use --fixed-pkts and --maxpackets
options.
>
> Consider the following case. I gave the injection rate to be 0.01
and simCycles to be 1000. I did not use --fixed-pkts and --
maxpackets options. As a result at the end of simulation each node
injected different number of packets. But, some nodes injected more
packets than 1000*0.01 = 10 packets. This is where I am confused.
How can a node inject more packets than the product of
injectionrate and simCycles even though the maxpackets option is
not enabled?
>
> Thanks for your time.
>
> Thanks,
> Pavan
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