PHP Performance/Scalability

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I have a very simple PHP application which I develop on Apache-Web-Server. However the application does not scale beyond 1500 concurrent users (150 requests/sec), even though there is plenty of hardware available (CPU is getting utilized 15%, Memory is getting utilized 15%).

On a similar note, when I develop the same application in Java, it scales to more than 6000 concurrent users (600 requests/sec) on the same hardware.

Any pointers on how to address this scalability issue?


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