Introduction

This repository uses JMH to evaluate the performance of Log4j2 synchronous logging across different JDK versions.

1. Usage

1.1 Evaluation using JDK 21

Use the main branch

mvn clean
mvn install
{JAVA21_HOME}/bin/java -jar target/benchmarks.jar "FileAppenderSyncBenchmark.*" -jvmArgs "-Xmx2g -Xms2g" -f 2 -t 16 -w 10 -wi 2 -r 30 -i 2 -to 300 -prof gc -rf json

1.2 Evaluation using JDK 1.8

Switch to the jdk1.8 branch

mvn clean
mvn install
{JAVA8_HOME}/bin/java -jar target/benchmarks.jar "FileAppenderSyncBenchmark.*" -jvmArgs "-Xmx2g -Xms2g" -f 2 -t 16 -w 10 -wi 2 -r 30 -i 2 -to 300 -prof gc -rf json

2. result

1. Laptop configuration: I5-1350P CPU, 32GB DDR5 5200 RAM, and Samsung MZVL4512HBLU-00BLL 512GB SSD.
2. Log4j2 version is 2.24.3.
3. Perform three performance tests and calculate the average value.
4. Using Logger + FileAppender (default configuration).

JDK Version	Score	gc.alloc.rate	gc.count
JDK 21.05	33.08 ops/ms	635.45 MB/sec	61.33
JDK 1.8.171	47.65 ops/ms	1,651.85 MB/sec	294

Please refer to the detailed configuration parameters and execution results：jmh-result