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 > > _______________________________________________ > > gem5-users mailing list > > [email protected] > > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
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