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‎README.md

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# Load Simulator
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## How to Start the Load Simulator
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### Ubuntu
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```
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sudo apt install openjdk-21-jre-headless -y
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java --version
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wget https://github.com/tagitmobile/load-simulator/releases/download/v0.0.1/load-simulator-0.0.1.jar
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java -jar load-simulator-0.0.1.jar
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```
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That's it!
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## Benchmarking the Load Simulator
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### Smoke Test
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To test the simulate, use the following commands:
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- `curl localhost:8080/load/simple`
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- `curl localhost:8080/load/random`
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- `curl localhost:8080/load/fibonacci`
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You should see the following lines printed in the server.
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```
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2024-12-19T14:36:46.900Z INFO 1544 --- [LoadSimulator] [mcat-handler-10] c.t.c.l.web.LoadTestController : Computation done. Sum = 1999999000000. Time elapsed = 9 ms. on VirtualThread[#42,tomcat-handler-10]/runnable@ForkJoinPool-1-worker-1
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2024-12-19T14:37:22.744Z INFO 1544 --- [LoadSimulator] [mcat-handler-16] c.t.c.l.web.LoadTestController : Computation done. Sum of Random Numbers = 429836190657872. Time elapsed = 59 ms. on VirtualThread[#49,tomcat-handler-16]/runnable@ForkJoinPool-1-worker-2
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2024-12-19T14:37:57.602Z INFO 1544 --- [LoadSimulator] [mcat-handler-18] c.t.c.l.web.LoadTestController : Computation done. Fib(35) = 9227465. Time elapsed = 40 ms. on VirtualThread[#51,tomcat-handler-18]/runnable@ForkJoinPool-1-worker-3
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```
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### Benchmark
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#### Install Apache HTTP Server Benchmarking Tool
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https://httpd.apache.org/docs/2.4/programs/ab.html
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```
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sudo apt install apache2-utils -y
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```
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#### Run locally
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```
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ab -n 10 -c 2 http://localhost:8080/load/simple
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```
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#### Run remotely
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##### Simple
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```
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ab -n 10000 -c 8 http://ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com:8080/load/simple
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```
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##### Random
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```
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ab -n 1000 -c 8 http://ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com:8080/load/random
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```
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Increase the number of requests `-n` and the concurrency `-c` accordingly to perform the load test.

‎build.gradle

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}
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group = 'com.tagit.commons'
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version = '0.0.1-SNAPSHOT'
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version = '0.0.2'
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java {
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toolchain {

‎results/m6a-random.txt

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$ ab -n 1000 -c 8 http://ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com:8080/load/random
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This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
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Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
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Licensed to The Apache Software Foundation, http://www.apache.org/
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Benchmarking ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com (be patient)
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Completed 100 requests
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Completed 200 requests
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Completed 300 requests
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Completed 400 requests
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Completed 500 requests
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Completed 600 requests
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Completed 700 requests
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Completed 800 requests
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Completed 900 requests
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Completed 1000 requests
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Finished 1000 requests
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Server Software:
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Server Hostname: ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com
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Server Port: 8080
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Document Path: /load/random
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Document Length: 57 bytes
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Concurrency Level: 8
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Time taken for tests: 49.143 seconds
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Complete requests: 1000
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Failed requests: 0
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Total transferred: 190000 bytes
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HTML transferred: 57000 bytes
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Requests per second: 20.35 [#/sec] (mean)
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Time per request: 393.144 [ms] (mean)
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Time per request: 49.143 [ms] (mean, across all concurrent requests)
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Transfer rate: 3.78 [Kbytes/sec] received
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Connection Times (ms)
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min mean[+/-sd] median max
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Connect: 2 4 0.8 4 15
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Processing: 60 388 41.1 389 493
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Waiting: 60 388 41.1 388 493
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Total: 63 392 41.2 392 496
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Percentage of the requests served within a certain time (ms)
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50% 392
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66% 411
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75% 421
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80% 426
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90% 443
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95% 457
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98% 471
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99% 478
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100% 496 (longest request)

‎results/m6a-simple.txt

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$ ab -n 10000 -c 8 http://ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com:8080/load/simple
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This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
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Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
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Licensed to The Apache Software Foundation, http://www.apache.org/
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Benchmarking ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com (be patient)
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Completed 1000 requests
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Completed 2000 requests
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Completed 3000 requests
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Completed 4000 requests
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Completed 5000 requests
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Completed 6000 requests
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Completed 7000 requests
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Completed 8000 requests
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Completed 9000 requests
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Completed 10000 requests
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Finished 10000 requests
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Server Software:
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Server Hostname: ec2-18-136-200-73.ap-southeast-1.compute.amazonaws.com
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Server Port: 8080
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Document Path: /load/simple
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Document Length: 37 bytes
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Concurrency Level: 8
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Time taken for tests: 24.348 seconds
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Complete requests: 10000
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Failed requests: 0
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Total transferred: 1700000 bytes
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HTML transferred: 370000 bytes
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Requests per second: 410.71 [#/sec] (mean)
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Time per request: 19.478 [ms] (mean)
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Time per request: 2.435 [ms] (mean, across all concurrent requests)
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Transfer rate: 68.19 [Kbytes/sec] received
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Connection Times (ms)
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min mean[+/-sd] median max
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Connect: 2 7 59.5 3 1089
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Processing: 6 13 3.4 12 31
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Waiting: 6 13 3.4 12 31
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Total: 8 19 59.7 15 1104
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Percentage of the requests served within a certain time (ms)
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50% 15
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66% 17
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75% 18
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80% 19
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90% 21
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95% 22
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98% 25
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99% 27
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100% 1104 (longest request)

‎results/m6g-random.txt

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$ ab -n 1000 -c 8 http://ec2-13-251-106-123.ap-southeast-1.compute.amazonaws.com:8080/load/random
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This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
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Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
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Licensed to The Apache Software Foundation, http://www.apache.org/
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Benchmarking ec2-13-251-106-123.ap-southeast-1.compute.amazonaws.com (be patient)
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Completed 100 requests
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Completed 200 requests
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Completed 300 requests
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Completed 400 requests
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Completed 500 requests
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Completed 600 requests
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Completed 700 requests
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Completed 800 requests
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Completed 900 requests
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Completed 1000 requests
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Finished 1000 requests
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Server Software:
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Server Hostname: ec2-13-251-106-123.ap-southeast-1.compute.amazonaws.com
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Server Port: 8080
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Document Path: /load/random
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Document Length: 57 bytes
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Concurrency Level: 8
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Time taken for tests: 109.785 seconds
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Complete requests: 1000
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Failed requests: 0
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Total transferred: 190000 bytes
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HTML transferred: 57000 bytes
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Requests per second: 9.11 [#/sec] (mean)
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Time per request: 878.279 [ms] (mean)
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Time per request: 109.785 [ms] (mean, across all concurrent requests)
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Transfer rate: 1.69 [Kbytes/sec] received
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Connection Times (ms)
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min mean[+/-sd] median max
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Connect: 2 3 1.2 3 14
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Processing: 207 870 117.0 860 1437
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Waiting: 207 870 117.0 860 1437
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Total: 209 874 117.1 863 1440
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Percentage of the requests served within a certain time (ms)
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50% 863
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66% 914
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75% 945
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80% 961
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90% 1017
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95% 1077
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98% 1144
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99% 1187
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100% 1440 (longest request)

‎results/m6g-simple.txt

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$ ab -n 10000 -c 8 http://ec2-13-251-106-123.ap-southeast-1.compute.amazonaws.com:8080/load/simple
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This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
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Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
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Licensed to The Apache Software Foundation, http://www.apache.org/
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Benchmarking ec2-13-251-106-123.ap-southeast-1.compute.amazonaws.com (be patient)
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Completed 1000 requests
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Completed 2000 requests
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Completed 3000 requests
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Completed 4000 requests
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Completed 5000 requests
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Completed 6000 requests
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Completed 7000 requests
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Completed 8000 requests
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Completed 9000 requests
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Completed 10000 requests
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Finished 10000 requests
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Server Software:
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Server Hostname: ec2-13-251-106-123.ap-southeast-1.compute.amazonaws.com
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Server Port: 8080
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Document Path: /load/simple
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Document Length: 37 bytes
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Concurrency Level: 8
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Time taken for tests: 15.597 seconds
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Complete requests: 10000
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Failed requests: 0
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Total transferred: 1700000 bytes
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HTML transferred: 370000 bytes
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Requests per second: 641.15 [#/sec] (mean)
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Time per request: 12.478 [ms] (mean)
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Time per request: 1.560 [ms] (mean, across all concurrent requests)
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Transfer rate: 106.44 [Kbytes/sec] received
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Connection Times (ms)
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min mean[+/-sd] median max
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Connect: 1 5 38.7 3 1074
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Processing: 4 7 2.7 7 37
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Waiting: 4 7 2.6 7 37
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Total: 5 12 38.8 10 1083
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Percentage of the requests served within a certain time (ms)
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50% 10
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66% 11
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75% 11
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80% 12
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90% 14
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95% 16
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98% 20
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99% 24
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100% 1083 (longest request)

‎src/main/java/com/tagit/commons/loadsimulator/web/LoadTestController.java

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import java.security.SecureRandom;
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import java.util.Arrays;
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import java.util.Random;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RestController;
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// Define a large size for the array
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int size = 400000;
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// Create and populate a large array of random integers
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int[] numbers = new int[size];
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Random rand = new Random();
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for (int i = 0; i < size; i++) {
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numbers[i] = rand.nextInt(Integer.MAX_VALUE);
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}
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// Sum the elements to generate CPU usage
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long sum = 0;
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for (int n : numbers) {
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sum += n;
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}
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// Sort the array to increase CPU usage further
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Arrays.sort(numbers);
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long end = System.currentTimeMillis();
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long elapsed = end - start;
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log.info("Computation done. Sum of Random Numbers = " + sum + ". Time elapsed = " + elapsed + " ms. on " + Thread.currentThread().toString());
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return "Computation done. Sum of Random Numbers = " + sum;
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}
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@GetMapping("/load/securerandom")
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public String load2b() {
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long start = System.currentTimeMillis();
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// Define a large size for the array
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int size = 400000;
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// Create and populate a large array of random integers
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int[] numbers = new int[size];
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SecureRandom rand = new SecureRandom();
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return "Computation done. Sum of Random Numbers = " + sum;
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}
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@GetMapping("/load/fibonacci")
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public String loadFibonacci() {
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long start = System.currentTimeMillis();

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