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dilipsundarraj1 / modern-java-concurrency

This repo has the code for modern java concurrency.

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modern-java

This repo has the code for modern java.

Table of Contents

Java Installation using Installer

  • Download the latest java from the below link

Install the Latest Version of JAVA using SDK man

Install sdkMan

  • Follow the instructions in the below link to install sdkman in your mac.

Install Java using sdk man

  • Run the below command to view the different version of supported Java
sdk list java

How to install a specific Java Version ?

Java 21
sdk list java | grep '21'
  • Running the below command will install Java 20.
sdk install 21.0.1-tem

Spring Boot using Virtual Threads

application.yml

  • Add the below config in the application.yml
spring:
  threads:
    virtual:
      enabled: true

Validate virual threads are enabled

  • Run the below command to check the thread executing the request
curl -i http://localhost:8080/currentThread

Remote Service

curl -i http://localhost:8085/remote/2

Client Call to remote Service

curl -i  http://localhost:8080/blocking/1

Benchmarking with "ab - Apache HTTP server benchmarking tool"

Install "ab - Apache HTTP server benchmarking tool"

Install ab on mac

Install ab on windows

Set Up

application.yml

  • We are just going to have 10 tomcat threads to handle our requests
    • This is to simplify our testing and comparison will be straightforward with this config
server:
  tomcat:
    threads:
      max: 10

Benchmark with 10 requests with the 10 concurrent users

  • This command will run ten requests with the concurrency of 10.
    • This means all the 10 requests will be run in parallel.
    • Since we are passing 2, then it should take approximately 2 seconds to complete.
ab -n 10 -c 10  http://localhost:8080/blocking/2

Benchmark with 20 requests with the 10 concurrent users

  • This command will run ten requests with the concurrency of 10.
    • This means all the 10 requests will be run in parallel.
    • Since we are passing 2, then it should take approximately 4 seconds to complete.
ab -n 20 -c 10  http://localhost:8080/blocking/2

With Virtual Threads

  • It took 6.055 seconds to complete
    • Ideally it should have completed in ~4 seconds, but the benchmarking tool adds a little bit of delay to the overall time to complete.

Without Virtual Threads

  • It took 6.199 seconds to complete

Benchmark with 60 requests with the 20 concurrent users

ab -n 60 -c 20  http://localhost:8080/blocking/2
  • Each batch we will send 20 requests and wait for it to complete.
    • So in this case, there will be 3 batches of 20 concurrent requests will be sent.

With Virtual Threads

  • It took 8.078 seconds to complete
    • Ideally it should have completed in ~6 seconds, but the benchmarking tool adds a little bit of delay to the overall time to complete.
    • The Average time for each request is ~2 seconds
    Percentage of the requests served within a certain time (ms)
50%   2022
66%   2023
75%   2023
80%   2024
90%   2025
95%   2026
98%   2026
99%   2026
100%   2026 (longest request)

Without Virtual Threads

  • It took 14.179 seconds to complete
    • The Average time for each request is ~4 seconds
    Percentage of the requests served within a certain time (ms)
  50%   4037
  66%   4037
  75%   4038
  80%   4039
  90%   4040
  95%   4040
  98%   4041
  99%   4041
 100%   4041 (longest request)

Summary

  • The results above prove virtual-threads are far better in handling blocking IO calls better than the platform threads.

About

This repo has the code for modern java concurrency.

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