Web servers must be protected from overload since server overload can lead to low throughput and high, unpredictable response times. In this paper we present a new admission control architecture that prevents server overload caused by high paging rates. The main idea of our admission control scheme is to delay the processing of requests when there is high memory pressure. We present experiments that show that our admission control architecture sustains high throughput even during a flash crowd of memory-intensive requests.
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