Re: [Gems-users] Injection rate option doesn't work

[신민정 <berebere86@xxxxxxxxx>]

I checked that too, but the curve looks very linear.

By the way, I changed the injection_rate value in “Tester.C” file as

//injection_rate = .1;

injection_rate = RubyConfig::injectionRate();

 

where injectionRate() function returns g_TRAFFIC_INJECTION_RATE in “RubyConfig.h” file.

Is this right???

This is all I changed, but I think I did something wrong.

 

How did you get the curve in the paper using Garnet network tester???

 

I ran the tester on 4X4 mesh with MOESI CMP Directory protocol.

My running command is as follows.

           ./tester.exec -l 10000 -i 0.1

And output file shows

           Average Link Utilization :: 0.0897725 flits/cycle

-------------

Average VC Load [0] = 12.9272 flits/cycle

Average VC Load [1] = 0 flits/cycle

Average VC Load [2] = 0 flits/cycle

Average VC Load [3] = 0 flits/cycle

-------------

Total flits injected = 240090

Total flits recieved = 240090

Average network latency = 94.6688

Average queueing latency = 31032.1

Average latency = 31126.8

-------------

Total Link Power = 3.21034 W

Total Router Power = 8365.3 W

 

However, in the paper, average latency is under 50 when injection rate is 0.1.

I would appreciate your help.

 

Thanks.

 

Minjeong

 

From: Niket Agarwal [mailto:niketa@xxxxxxxxxxxxx]
Sent: Monday, January 25, 2010 1:46 AM
To: Minjeong Shin
Cc: Gems Users
Subject: Re: Injection rate option doesn't work

 

Hi Minneong, 

 

             What you are seeing is "Average network latency" and it is the number of cycles that a flit spends in the network. At saturation, this does not increase and what increases is the queuing delay at network interfaces. In the printStats function in GarnetNetwork_d.C, please uncomment the lines that print out the queuing latency and total latency to see those values. 

 

-Niket 

 

On Jan 24, 2010, at 7:49 AM, Minjeong Shin wrote:

Hi Niket,

 

I am using Garnet network-tester at http://www.princeton.edu/~niketa/garnet_files/tester-network-only.tgz

 

I wanted to get “injection rate – average latency” curve which is in the GARNET technical paper,

However, injection rate option (‘-i’ parameter) in the network-tester doesn’t work at all.

 

I checked the “Tester.C” file and injection_rate was just set to 0.1.

However, even if I change the injection_rate value, Average network latency never increased over 100.

And I don’t see any similarity between my result and the curve in the paper.

 

Is there anything I did wrong?

lease help me doing this.

 

Thank you.

 

Minjeong

 

--
Minjeong Shin
Dept. of Computer Science
Korea Advanced Institute of Science and Technology
+82-10-5553-2950