Hi   I'm a new learner on gem5 and ubuntu , now I am using Garnet to run 
the examples on the tutorial .
The command line is following :
./build/NULL/gem5.opt configs/example/garnet_synth_traffic.py --network=garnet 
--num-cpus=16 --num-dirs=16 --topology=Mesh_XY --mesh-rows=4 --sim-cycles=20000 
--synthetic=uniform_random --injectionrate=0.1
This command can be run,but the results in the stats.txt is very strange, the 
latency is too high, the result is in the end , in the youtube video, the 
result is very small. And if I change the injecitonrate=0.01 and the 
sim-cycles=1000 , the latency has no results. I downlode the latest version of 
gem5, the garnet version  I use is 3.0 . I run the command on the ubuntu 
18.04 and 20.04, the result is same.  Is it because of the garnet version? 
A teacher ask me to change the version to 2.0, is it nessary? If so , how 
to  change the garnet version?
The following is the command line rusults:
    system.ruby.network.avg_vc_load::total      
 5.850000                  
    
    system.ruby.network.ext_in_link_utilization      
     59                
      
    system.ruby.network.ext_out_link_utilization      
     38                
      
    system.ruby.network.flit_network_latency |      
 38500                  
     |       20500      
                 |    
   92000                
      
    system.ruby.network.flit_queueing_latency |      
 11000                  
     |        6000      
                 |    
   17000                
      
    system.ruby.network.flits_injected      
 |          13     20.63%  
   20.63% |          10    
 15.87%     36.51% |          
40     63.49%    100.00%
    system.ruby.network.flits_injected::total      
     63                
      
    system.ruby.network.flits_received      
 |          11     32.35%  
   32.35% |           6    
 17.65%     50.00% |          
17     50.00%    100.00%
    system.ruby.network.flits_received::total      
     34                
      
    system.ruby.network.int_link_utilization      
    137                  
    
    system.ruby.network.packet_network_latency |      
 38500                  
     |       20500      
                 |    
   20000                
      
    system.ruby.network.packet_queueing_latency |      
 11000                  
     |        6000      
                 |    
    3000        


Thanks         
Zhang Meng      
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