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3. Capacity Planning > How Much Memory Do You Need?

How Much Memory Do You Need?

The answer is “more.” It’s a rule of thumb that you always need more memory. The worst thing short of total failure that can happen to your server is a memory shortage serious enough to start the swapping of entire processes out to disk. When that happens, performance will quickly drop, and users will wonder if it’s worth their time to wait for your content. It is better to refuse the excess connections you cannot handle well than for all of your users to get unacceptable performance.

Servers that run as multiple processes, such as Apache, have a configurable limit to the number of processes and simultaneous connections per process. Multithreaded servers provide limits to the number of active threads. See


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