I used Jupyter and finished some work few days ago. I forgot to shut down the kernel but I notice something strange today. Apparently, the julia process is occupying 40% cpu even though nothing is running.
I diagnosed further with strace and it turns up a bunch of repeated epoll_wait system calls. I don’t mind it goes into a loop but it shouldn’t occupy so much cpu either. Has anyone seen such problem before? This is v0.6.3.
$ strace -p 24868
strace: Process 24868 attached
epoll_wait(5, [], 1024, 52) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 52) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 52) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 60) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 61) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 62) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 62) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 0) = 0
epoll_wait(5, [], 1024, 62) = 0
top:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
24868 tkwong 20 0 38.865g 0.028t 0.022t S 46.5 0.9 1730:59 julia
1