[gem5-users] Re: Garnet

[Krishna, Tushar via gem5-users]

Hmm you can go back to an older version of garnet by cloning an older version 
of gem5 - but I don’t think you need to. Lets try to figure out what’s going 
on. What do you mean by the result being different from the YouTube video?

Can you also try running with --inj-vnet=0 .. this injects only single flit 
packets so easier to understand / debug the results.

Best,
Tushar
On Jan 20, 2021, 10:09 AM -0500, 等价无穷小 via gem5-users <gem5-users@gem5.org>, 
wrote:
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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