Generating a load message file

We may want to run simulations where we have specific number of messages of different sizes generated in a particular time interval. This is needed when we run traces of Reality, Infocom etc. ONE provides a Perl script in the toolkit folder which can generate this for you. The only pre-requisite is that you have a Perl installed in your system.

For example,

In Windows run a command like this from the toolkit folder:

perl createCreates.pl -time 0:19000 -nrof 100 -hosts 0:35 -sizes 1000:100000 > load.txt


In Linux, do the following:

./createCreates.pl -time 0:19000 -nrof 100 -hosts 0:35 -sizes 1000:100000 > load.txt

Here,

time: You should specify the start time and end time. Please make sure that the end time if greater than the last encounter time that is used in the trace files.

nrof: Number of messages to be generated within the time frame.

size: The minimum and maximum sizes of the messages that you want to generate.

The above example will load the messages into the load.txt file and will be present in the toolkit folder. If you need to generate it in some specific folder mention that in the command. For example:

perl createCreates.pl -time 0:19000 -nrof 100 -hosts 0:35 -sizes 1000:100000 > C:\Users\Nikhitha\Desktop\load.txt

After your load file is generated place this in the same folder where the one.bat file resides. Now edit the setting like this:

# How many event generators
Events.nrof = 1
## Message creation parameters
Events1.class = ExternalEventsQueue
Events1.filePath = load.txt


In my first post I had shown the example where the Events1.class=MessageEventGenerator. Here we use another class called ExternalEventsQueue which will read the load.txt and genarate the messages. As I said, this stuff is generally used when we want to run traces like Cambridge. Infocom etc. For beginners I would suggest running with the same MessageEventGenerator class. All message creation classes can be seen in the input folder of ONE (ONE/input).


Hope it helps!!