toporhtop— what process is using CPU?pidstat 1— confirm sustained vs spike- If multi-core:
mpstat -P ALL 1— is it pinned to one core? strace -p <pid>— what syscalls is it making? (use sparingly, can slow the process)- Application-specific: thread dump, profiler, APM data
- Is it consuming I/O too?
iostat -xz 1