Comment by spc476

strace was not on my radar. I know it exists, it just never occurred to me to use it. So, I tried it. Here are the results:

    4542 open
    3041 read
    2990 close
    2517 epoll_ctl
    2478 old_mmap
    2475 munmap
    2470 fstat64
    1509 epoll_wait
    1509 clock_gettime
    1501 ioctl

ioctl() (that, combined with epoll_ctl() and epoll_wait(), which was the actual problem) does show up in the top 10, but it doesn't scream "I'm the issue!"