thundering herd problem: Scheduler thrashing. This can happen
under Unix when you have a number of processes that are waiting on a
single event. When that event (a connection to the web server, say)
happens, every process which could possibly handle the event is
awakened. In the end, only one of those processes will actually be
able to do the work, but, in the meantime, all the others wake up
and contend for CPU time before being put back to sleep. Thus the
system thrashes briefly while a herd of processes thunders through.
If this starts to happen many times per second, the performance
impact can be significant.
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