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Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.
Nginx is event based and by default runs as 1 process supporting max 512 concurrent connections.
What are worker_processes in Nginx. The worker_processes are used to specify the total number of worker processes to spawn simultaneously. The number of worker_processes in Nginx is set to one by default. Executing one worker process per CPU core works perfectly, and we also recommend you configure it in this way.
Config file:
worker_processes 4; # 2 * Number of CPUs
events {
worker_connections 19000; # It's the key to high performance - have a lot of connections available
}
worker_rlimit_nofile 20000; # Each connection needs a filehandle (or 2 if you are proxying)
# Total amount of users you can serve = worker_processes * worker_connections
more info: Optimizing nginx for high traffic loads
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