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MediSyn: A streaming media service workload generator

MediSyn is a streaming media service workload generator that aims to
generate long-term, realistic, reprensentative, enterprise media
service workloads. It can generate short-term media sevice
workloads as well. For details, please read our technical report
on MediSyn included in the distribution package.

Building MediSyn

Currently the code is only tested on Linux Platform.
Simply download the source code and compile the source
code on your platform.

Running MediSyn

For generating long-term trace, run shell script

medisyn.long.sh

For generating short-term trace, run shell script

medisyn.short.sh

Parameter Setting

There are a number of parameters you might want to
tune. All the tunable prarameters can be customized
through a configuration file medisyn.cfg. The thing
worth noting is that in order to generate short term
trace, the user has to specify a maximum duration of
the trace in days by setting the variable

LifespanclassTrivialClassDistParamUnifb

in the file life span section.

Output

medisyn.long.sh and medisyn.short.sh execute a
list of programs in order to generate a trace.
Each line in the shell script generates one
property. The properties are generated in the following order

popularity
duration
prefix
bitrate
filearrival
lifespanclass

each step will generate a text file with suffix .txt.

session/sessionshort executable will read the latest
.txt file which has all the properties of files
and synthesize the access log. Two logs are generated:
"session.log" and "request.log". session.log has
3 fields and in the format of

relative timestamp in seconds
file id start from 1
session duration in seconds

The file bit rate encoding and file duration properties
which can be used to populate the file set, are generated
by fileinfo executable and is written in serverinfo.txt.

request.log is quite similar to session.log, but the format
of request.log is more similar to access logs generated
by media servers such Windows Media Server Log.
request.log has 7 fields:

relative timestamp from 0 in seconds
file id start from 1
start time of the session ( currently all are 0, because
we don't support interactivity yet).
duration of the session
operation (1 means play, later we will introduce other
operations, like pause, ff, rewind)
duration of the file
bit rate of the file

user can use this log to drive the simulation without
access to serverinfo.txt.

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1. fileinfo.cpp파일에 파일 이름이 잘못 지정이 되어 있어서 실행시 파일을 열수 없다고
나오기 때문에 변수값을 수정하였습니다.
변경전
const char * inputFileName = "freq_dur_prefix_rate_intro_ls.txt"
변경후
const char * inputFileName = "freq_dur_prefix_bitrate_intro_ls.txt"

2. make 후에 쉘스크립트를 바로 실행하면 프로그램들을 찾을수 없다고 나옵니다
make에서 만들어진 실행파일들을 PATH에 있는 경로로 옮기시거나
스크립트 파일에 프로그램이름 앞에 './'을 추가하시면 됩니다.
( 스크립트 파일에는 단순히 프로그램들 이름이 적혀 있습니다 )
By 이좌형
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