9 - [SpringBoot performance optimization]

A sweep packet optimization

Sweep start packet belongs to optimize, optimization not run

1.1 components automatically scan problems caused by

Use @SpringBootApplicationannotations, the package will traverse the following sub-categories, can affect performance.

By default, we will use @SpringBootApplicationannotations to automatically obtain configuration information for the application, but it will also bring some side effects to the application.

After using this annotation, triggers 自动配置(auto-configuration) and 组件扫描(component scanning), which with the use of @Configuration, @EnableAutoConfigurationand @ComponentScanthe role of three notes is the same. Doing so bring convenience to developers, there will be a threefold effect:

1. The project will lead to longer startup time. When starting a large application, or to do a lot of integration tests start the application, the impact will be particularly pronounced.
2. Loads some unwanted extra instance (beans).
3. Increase CPU consumption.

For the above three cases, we can be removed @SpringBootApplicationand @ComponentScantwo component annotations to disable automatic scanning, then we need beanto be explicitly configured on:

// 移除 @SpringBootApplication and @ComponentScan, 用 @EnableAutoConfiguration 来替代
// @SpringBootApplication
@ComponentScan(basePackages = "com.snow")
@EnableAutoConfiguration
public class App {

	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}

}

2 SpringBoot JVMParameter Tuning

JVM Tuning parameters, belonging to the overall optimization

The memory size of the server to set the parameters of the heap.

• -Xms: Set the initial size of the Java stack
• -Xmx: Set the maximum heap size java
  instance parameters-XX:+PrintGCDetails -Xmx32M -Xms1M

Local project Tuning:

External operation Tuning:

java -server -Xms32m -Xmx32m  -jar springboot_v2.jar

3 Servletcontainer becomesUndertow

Step 3.1

By default, Spring Boot using the embedded Tomcat as a Servlet container.

Web server can be switched to Undertow to improve application performance.

Undertow is a flexible, high-performance Web server Java development services including blocking NIO-based and non-blocking mechanism. Undertow is Red Hat's open source products, is Wildfly default Web server.

First, remove the Tomcat configuration dependent on information from inside:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!-- 添加 Undertow -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>

Start, we found using Undertow:

3.2 Test

Create thread groups

each request 10000

Creating HTTP request:

test:

Create an aggregate reports:

Test:
Click Run, view the test report

name of server	First run	Second run	Third run	average value
Tomcat	4773	5194	5334.7	5100
Undertow	6666	6373	6451	6496