From stackoverflow here : http://stackoverflow.com/questions/7325211/tuning-nginx-worker-process-to-obtain-100k-hits-per-min
worker_processes 4; # 2*number of cpus
events {
worker_connections 19000; #it's the key to high performance - have a lot of coinnections available
}
worker_rlimit_nofile 20000; #each connection needs a filehandle (or 2 if you are proxying)
keepalive_timeout 5; #that' another key - close live connections as early as possible or disable them completely
#total amount of users you can serve in 1 second = worker_processes*worker_connections/keepalive_timeout
More info about nginx directive: http://blog.martinfjordvald.com/2011/04/optimizing-nginx-for-high-traffic-loads/
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