Strange CPU performance drop when running a Java application on Ubuntu 22.04 with OpenJDK 11
I'm sure I'm missing something obvious here, but Quick question that's been bugging me - I'm experiencing a important drop in CPU performance when running a Java application on my Ubuntu 22.04 server using OpenJDK 11. The application runs fine on my local machine (macOS) but speeds drop drastically when I deploy it on the server. I've confirmed that the application's logic is sound and I've monitored the CPU usage using `top` and `htop`, which indicates that the Java process is consuming only a fraction of the available CPU resources, even while under load. I tried adjusting the Java options to see if it was a garbage collection scenario, but even with `-XX:+UseG1GC` and `-Xms512m -Xmx2048m`, the performance remains sluggish. Here are the JVM options I've been using: ```bash java -Xms512m -Xmx2048m -XX:+UseG1GC -jar myapp.jar ``` I also checked for any potential throttling due to power saving settings and ensured that the server is using the `performance` governor. Running `cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor` returns `performance` for all cores. Additionally, I looked into the system logs for any errors or warnings but found nothing relevant. The only related output I've seen is from the GC logs, which show frequent minor collections but don’t indicate any major issues. Is there something specific in Ubuntu or OpenJDK 11 that could be affecting CPU performance? Any insights or configurations I may have overlooked would be greatly appreciated! For context: I'm using Java on macOS. What am I doing wrong? Any help would be greatly appreciated! Thanks, I really appreciate it!