2014-04-26 10:52:28 -04:00
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thundering herd problem
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2014-04-26 11:54:15 -04:00
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Scheduler thrashing. This can happen under Unix when you have a number of
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processes that are waiting on a single event. When that event (a connection
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to the web server, say) happens, every process which could possibly handle
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the event is awakened. In the end, only one of those processes will actually
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be able to do the work, but, in the meantime, all the others wake up and
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contend for CPU time before being put back to sleep. Thus the system
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thrashes briefly while a herd of processes thunders through. If this starts
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to happen many times per second, the performance impact can be significant.
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