[gem5-users] Re: Gem5 / garnet 3.0 - Standalone

[Krishna, Tushar via gem5-users]

0.02 flits/node/cycle is too low an injection rate for deadlocks. Try higher 
rates.

I had created some labs in my NoC class in the past on deadlocks. It might be 
useful to take a look, esp Lab 3 on deadlocks.
https://tusharkrishna.ece.gatech.edu/teaching/icn_s20/

Some of the garnet repos from past papers from my group might be useful as well 
:
https://github.com/noc-deadlock

Cheers,
Tushar
On Apr 1, 2023, 12:12 AM -0400, Karim Soliman via gem5-users 
<gem5-users@gem5.org>, wrote:
Hey everyone,
My research field is about NoC and I'm working on gem5/garnet 3.0 standalone.
For research purposes, I'm trying to push Garnet standalone protocol into 
deadlock or traffic congestion during the simulation of Mesh_XY topology.
So, that's what i have done so far:
 • topologies/Mesh_XY.py ==> I changed the weight of all the internal links to 
be 1, to allow the routing to select random output.
 • mem/ruby/network/garnet/flitBuffer.cc ==> I reduced the max_size of the flit 
buffer to 2 instead of using INFINITE_ constant, by using setMaxSize(int size); 
method to apply this.
 • cpu/testers/garnet_synthetic_traffic/GarnetSyntheticTraffic.py ==> I reduced 
response_limit to be 1000.
 • cpu/testers/garnet_synthetic_traffic/GarnetSyntheticTraffic.cc ==> I used 
std::cout in the function doRetry() in order to check if there was any traffic 
congestion.
 • I'm using only two virtual channels by setting the option of --vcs-per-vnet=2
I rebuild gem5 using
sudo scons build/NULL/gem5.debug PROTOCOL=Garnet_standalone -j13My simulation 
command is
sudo build/NULL/gem5.debug configs/example/garnet_synth_traffic.py 
--synthetic=uniform_random --network=garnet --num-cpus=16 --num-dirs=16 
--mesh-rows=4 --topology=Mesh_XY --sim-cycles=50000000 --routing-algorithm=1 
--vcs-per-vnet=2 --injectionrate=0.02
I re-simulated using higher injection rates with no output from the doRetry() 
method, and no deadlock happened, are there any parameters I should change?



[https://upload.wikimedia.org/wikipedia/en/thumb/6/64/Pharos_University.jpg/220px-Pharos_University.jpg]Best
 Regards,Eng. Karim SolimanTeaching AssistantComputer Engineering 
DepartmentPharos University in Alexandria (P.U.A)

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