Single Server Queuing System (C++ Simulation)

Usage

Compile and Run:

git clone https://www.github.com/zedrex/ssqs.git
cd ssqs
cd src
make
./main

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Set Simulation Parameters (Input)

Input data after running main:

Sample Input

Inter Arrival Time Mean: 10  
Service Time Mean: 9
Total Number of Customers: 10

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Check Simulation Data (Output)

The program produces src/statistics.csv, src/event.csv and src/customer.csv on a successful run. For the above input, sample output is:

Tabular Output:

src/statistics.csv

Total Customers	Total Simulation Time	Average Inter Arrival Time	Average Service Time	Average Queue Delay	Average Queue Length	Server Utilization
10.000000	136.249576	10.610842	8.748052	6.792108	0.498505	64.206084%

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src/event.csv

Type	Start Time	Customer	Server Status	Queue Size	Customer In System
Arrival	4.174802	1	Idle	0	0
Service	4.174802	1	Busy	0	1
Departure	11.730683	1	Idle	0	0
Arrival	29.289969	2	Idle	0	0
Service	29.289969	2	Busy	0	1
Arrival	29.466160	3	Busy	1	2
Departure	29.940840	2	Idle	1	1
Service	29.940840	3	Busy	0	1
Departure	32.003091	3	Idle	0	0
Arrival	37.272871	4	Idle	0	0
Service	37.272871	4	Busy	0	1
Arrival	39.214842	5	Busy	1	2
Departure	50.451970	4	Idle	1	1
Service	50.451970	5	Busy	0	1
Arrival	50.981055	6	Busy	1	2
Departure	57.336250	5	Idle	1	1
Service	57.336250	6	Busy	0	1
Departure	60.942991	6	Idle	0	0
Arrival	81.014231	7	Idle	0	0
Service	81.014231	7	Busy	0	1
Departure	84.940370	7	Idle	0	0
Arrival	86.634322	8	Idle	0	0
Service	86.634322	8	Busy	0	1
Arrival	88.795877	9	Busy	1	2
Arrival	106.108419	10	Busy	2	3
Departure	122.141359	8	Idle	2	2
Service	122.141359	9	Busy	1	2
Departure	122.617015	9	Idle	1	1
Service	122.617015	10	Busy	0	1
Departure	136.249576	10	Idle	0	0

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src/customer.csv

Customer	Arrival Interval	Arrival Time	Service Start Time	Departure Time	Queue Delay Duration	Service Duration	Sojourn Time
1	4.174802	4.174802	4.174802	11.730683	0.000000	7.555881	7.555881
2	25.115166	29.289969	29.289969	29.940840	0.000000	0.650872	0.650872
3	0.176192	29.466160	29.940840	32.003091	0.474680	2.062251	2.536931
4	7.806711	37.272871	37.272871	50.451970	0.000000	13.179099	13.179099
5	1.941971	39.214842	50.451970	57.336250	11.237128	6.884281	18.121408
6	11.766213	50.981055	57.336250	60.942991	6.355195	3.606741	9.961936
7	30.033176	81.014231	81.014231	84.940370	0.000000	3.926139	3.926139
8	5.620091	86.634322	86.634322	122.141359	0.000000	35.507037	35.507037
9	2.161555	88.795877	122.141359	122.617015	33.345482	0.475656	33.821138
10	17.312542	106.108419	122.617015	136.249576	16.508596	13.632561	30.141157

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Raw CSV Data:

src/statistics.csv

Total Customers,Total Simulation Time,Average Inter Arrival Time,Average Service Time,Average Queue Delay,Average Queue Length,Server Utilization
10.000000,136.249576,10.610842,8.748052,6.792108,0.498505,64.206084%

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src/event.csv

Type,Start Time,Customer,Server Status,Queue Size,Customer In System
Arrival,4.174802,1,Idle,0,0
Service,4.174802,1,Busy,0,1
Departure,11.730683,1,Idle,0,0
Arrival,29.289969,2,Idle,0,0
Service,29.289969,2,Busy,0,1
Arrival,29.466160,3,Busy,1,2
Departure,29.940840,2,Idle,1,1
Service,29.940840,3,Busy,0,1
Departure,32.003091,3,Idle,0,0
Arrival,37.272871,4,Idle,0,0
Service,37.272871,4,Busy,0,1
Arrival,39.214842,5,Busy,1,2
Departure,50.451970,4,Idle,1,1
Service,50.451970,5,Busy,0,1
Arrival,50.981055,6,Busy,1,2
Departure,57.336250,5,Idle,1,1
Service,57.336250,6,Busy,0,1
Departure,60.942991,6,Idle,0,0
Arrival,81.014231,7,Idle,0,0
Service,81.014231,7,Busy,0,1
Departure,84.940370,7,Idle,0,0
Arrival,86.634322,8,Idle,0,0
Service,86.634322,8,Busy,0,1
Arrival,88.795877,9,Busy,1,2
Arrival,106.108419,10,Busy,2,3
Departure,122.141359,8,Idle,2,2
Service,122.141359,9,Busy,1,2
Departure,122.617015,9,Idle,1,1
Service,122.617015,10,Busy,0,1
Departure,136.249576,10,Idle,0,0

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src/customer.csv

Customer,Arrival Interval,Arrival Time,Service Start Time,Departure Time,Queue Delay Duration,Service Duration,Sojourn Time
1,4.174802,4.174802,4.174802,11.730683,0.000000,7.555881,7.555881
2,25.115166,29.289969,29.289969,29.940840,0.000000,0.650872,0.650872
3,0.176192,29.466160,29.940840,32.003091,0.474680,2.062251,2.536931
4,7.806711,37.272871,37.272871,50.451970,0.000000,13.179099,13.179099
5,1.941971,39.214842,50.451970,57.336250,11.237128,6.884281,18.121408
6,11.766213,50.981055,57.336250,60.942991,6.355195,3.606741,9.961936
7,30.033176,81.014231,81.014231,84.940370,0.000000,3.926139,3.926139
8,5.620091,86.634322,86.634322,122.141359,0.000000,35.507037,35.507037
9,2.161555,88.795877,122.141359,122.617015,33.345482,0.475656,33.821138
10,17.312542,106.108419,122.617015,136.249576,16.508596,13.632561,30.141157