I migrated my Java server from CentOS 8 to Rocky Linux 8. the CPU usage is higher than before (on Cent OS 8).
Here are the details of the top threads in the Java process on two operating systems:
RockyLinux8
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
609746 root 20 0 15.5g 7.0g 31648 R 6.3 45.3 8:00.95 XNIO-1 task-2
609758 root 20 0 15.5g 7.0g 31648 S 5.3 45.3 7:05.06 XNIO-1 task-9
609464 root 20 0 15.5g 7.0g 31648 S 4.6 45.3 41:43.31 lettuce-nioEven
609466 root 20 0 15.5g 7.0g 31648 S 4.6 45.3 38:27.62 lettuce-nioEven
609468 root 20 0 15.5g 7.0g 31648 S 4.3 45.3 39:24.71 lettuce-nioEven
618707 root 20 0 15.5g 7.0g 31648 S 3.6 45.3 0:11.44 XNIO-1 task-63
611491 root 20 0 15.5g 7.0g 31648 S 3.3 45.3 0:56.47 XNIO-1 task-20
609539 root 20 0 15.5g 7.0g 31648 S 2.3 45.3 19:00.52 XNIO-1 Accept
609532 root 20 0 15.5g 7.0g 31648 S 1.3 45.3 7:29.97 XNIO-1 I/O-2
609477 root 20 0 15.5g 7.0g 31648 S 1.0 45.3 8:22.03 kafka-producer-
609480 root 20 0 15.5g 7.0g 31648 R 1.0 45.3 9:50.90 pool-2-thread-3
609531 root 20 0 15.5g 7.0g 31648 S 1.0 45.3 7:22.77 XNIO-1 I/O-1
609534 root 20 0 15.5g 7.0g 31648 S 1.0 45.3 7:23.73 XNIO-1 I/O-4
609537 root 20 0 15.5g 7.0g 31648 S 1.0 45.3 7:21.69 XNIO-1 I/O-7
CentOS8
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
252173 root 20 0 15.3g 8.7g 31736 S 3.3 55.8 33:33.07 XNIO-1 task-24
258755 root 20 0 15.3g 8.7g 31736 S 2.7 55.8 13:13.16 XNIO-1 task-46
247548 root 20 0 15.3g 8.7g 31736 S 2.3 55.8 327:41.01 lettuce-nioEven
247552 root 20 0 15.3g 8.7g 31736 S 2.0 55.8 309:25.38 lettuce-nioEven
252176 root 20 0 15.3g 8.7g 31736 S 2.0 55.8 19:04.62 XNIO-1 task-27
247550 root 20 0 15.3g 8.7g 31736 S 1.7 55.8 297:43.67 lettuce-nioEven
247562 root 20 0 15.3g 8.7g 31736 S 1.0 55.8 76:39.45 kafka-producer-
252179 root 20 0 15.3g 8.7g 31736 S 1.0 55.8 29:18.36 XNIO-1 task-30
247614 root 20 0 15.3g 8.7g 31736 S 0.7 55.8 55:41.29 XNIO-1 I/O-6
247617 root 20 0 15.3g 8.7g 31736 S 0.7 55.8 135:45.15 XNIO-1 Accept
247554 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 42:02.05 SimplePauseDete
247555 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 41:23.20 SimplePauseDete
247609 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 55:42.72 XNIO-1 I/O-1
247612 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 56:02.54 XNIO-1 I/O-4
247613 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 55:57.00 XNIO-1 I/O-5
247881 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 17:13.01 XNIO-1 task-7
489740 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 35:56.69 pool-2-thread-1
687519 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 0:00.39 pool-2-thread-2
689693 root 20 0 15.3g 8.7g 31736 S 0.3 55.8 0:00.02 pool-2-thread-2
247518 root 20 0 15.3g 8.7g 31736 S 0.0 55.8 0:00.00 java
247519 root 20 0 15.3g 8.7g 31736 S 0.0 55.8 0:07.04 java
247520 root 20 0 15.3g 8.7g 31736 S 0.0 55.8 0:58.91 GC Thread#0
Have you ever been in this situation? Is there anything I can use to check why the JVM on RockyLinux8 is using more CPU than before?
Thank you for your help.
