cron.php high cpu usage

[kh99]

It may turn out to be the Event Reminder, but the error messages here:

Process 23618 attached - interrupt to quit
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "H", 1, MSG_PEEK, NULL, NULL) = 1
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "H", 1, MSG_PEEK, NULL, NULL) = 1
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "H", 1, MSG_PEEK, NULL, NULL) = 1
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "H", 1, MSG_PEEK

refer to the operating system functions poll() and recvfrom() which have to do with reading from sockets (network connections), so the problem doesn't necessarily have anything to do with vbulletin events or polls.

If the problem still exists after upgrading to vb3.8.9, I would look at things that make network connections, like sending emails (birthdays?) or getting RSS feeds (if you have any of those defined).