I am having problems scaling concurrent connections on Cherokee and Lighttpd. Am I right to conclude there is a physical limit (at say 250-300) to the number of concurrent PHP requests a server can handle. 20mb memory usage per fastcgi = 20*300=6GB of ram. High concurrency can only be implemented on a cluster correct? The unfortunate part is that my CPU usage is 98 idle while serving 250 concurrent requests but the server magically comes to a complete stand still. Some requests are handled in over 30 seconds. Keepalive is off.
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