omnet++ - Running parallel simulations (using the Command Line) -

how can run simulation different configurations? using omnet++ version 4.6.

my omnetpp.ini file looks below :

[general]  [config dcn2]  network = dcn2  # leaf switch #**.down_port = 2 **.up_port = 16 #12   # 4  # spine switch **.port =  28 # 20 #2048  # crossconnect **.cross_down_port = 28 # 20 #2048 **.cross_up_port = 28 # 20 #2048  # set destination of packet **.number_leaf_switch = 28 # 20 #2048  # link speed #**.switch_switch_link_speed = 40 mbps   **.interarrivaltime = ${exponential(.0001),exponential(0.0002),exponential(0.0003)}     **.batch_length = 10 **.buffer_length = 10  sim-time-limit = 1000s 

i want run code different values of interarrivaltime. can neither run different configs (one after another), nor can run individual runs in parallel on separate cores.

i have tried cmdev option in run configurations different runs doesn't show apart 1st one. when try mentioning number of processes more 1 first run gets simulated. cannot find out reason.

config examinataion

in case can perform config examination. omnet++ offers different options that. explained under parameter studies section of omnet++ manual.

so can try 1 of following options examine configs , config file:

• ./run –a - show configurations in omnet.ini
• ./run -x <config_name> - give more info specific config
• ./run -x <config_name> -g - see combinations of configs

first have navigate example folder, , there execute 1 of aforementioned commands.

---

i executed: ./run -x dcn2 -g , got following resuls

omnet++ discrete event simulation  (c) 1992-2014 andras varga, opensim ltd. version: 4.6, build: 141202-f785492, edition: academic public license -- not commercial use see license distribution terms , warranty disclaimer setting tkenv...  config: dcn2 number of runs: 3 run 0: $0=exponential(.0001), $repetition=0 run 1: $0=exponential(0.0002), $repetition=0 run 2: $0=exponential(0.0003), $repetition=0  end. 

this confirms indeed have 3 different runs simulation parameter trying modify. however, variable name using interarrivaltime parameter assigned $0 default because have not specified it.

if change following line in config:

**.interarrivaltime = ${exponential(.0001),exponential(0.0002),exponential(0.0003)} 

to

**.interarrivaltime = ${interarrivaltime = exponential(0.0001),exponential(0.0002),exponential(0.0003)} 

you more descriptive output ./run -x dcn2 -g

---

running different runs of config:

next step run different runs config. can navigating example directory , execute:

./run -c <config-name> -r <run-number> -u cmdenv 

note <config-name> dcn2 you, , -r specifies of runs given above execute.

in other words can open 3 terminal windows , navigate example directory , do:

1. ./run -c dcn2 -r 0 -u cmdenv - interarrivaltime = exponential(0.0001)
2. ./run -c dcn2 -r 1 -u cmdenv - interarrivaltime = exponential(0.0002)
3. ./run -c dcn2 -r 2 -u cmdenv - interarrivaltime = exponential(0.0003)

---

distinguishing different run results

to able distinguish between output result files of different runs given config can modify default name of output file.

the "how-to" given in 12.2.3 result file names section of omnet++ manual.

output-vector-file = "${resultdir}/${configname}-${runnumber}.vec" output-scalar-file = "${resultdir}/${configname}-${runnumber}.sca" 

as can see default output files distinguished ${runnumber} variable. can further improve adding interarrivaltime output file name.

example:

output-scalar-file = "${resultdir}/${configname}-${runnumber}-iatime=${interarrivaltime}.sca/vec" 

i have not tested final approach. might error along path.