High CPU usage in macos Catalina

After upgrade to macos catelina v10.15.1, the high CPU usage start to show up once a day. It will goes up to take something like 500% CPU, it will last for dozens of seconds. No idea what trigger it, sometimes open a file, sometimes open a project.

After trying many times, i finally use Instruments to do a time profiling on creator, about 20s when the creator going crazy. One thread(_dispatch_workloop_worker_thread) use about 11s calling on kevent_id, and there are about 10000 threads in creator process, all by name _dispatch_workloop_worker_thread, which all ends up to kevent_id.