Control the MaxClients setting in Apache
A webserver should never ever have to swap, as swapping increases the latency of each request.
You can, and should, control the MaxClients* setting so that your server does not spawn so many children it starts swapping. This procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes.
*MaxClients [Maximum number of connections that will be processed simultaneously]
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