nginx passenger config

nginx, worker_processes, and passenger_max_pool_size
Production Rails Tuning with Passenger: PassengerMaxProcesses

 
worker_processes 4;    <= Setting the number of Nginx workers to the number of CPU cores should be sufficient. 

http { 
passenger_max_pool_size 20; # memory 256M should be 2,  2G should be 30, max_pool 不要設太大, 不要讓它吃到swap,  free -ml ;  vmstat 2  都可以看到現在memory 的情況
passenger_max_instances_per_app 15; #每種ap 能用到最多的instance, 所以如果跑兩個app 就會再少一點

# PassengerPoolIdleTime
# Recommended to be avg time per page * 2
# In Google Analytics... (Avg time on site / Avg page views) * 2
# Default: 300
passenger_pool_idle_time 144

 } 

超小型web server 設定
How to save MUCH RAM when running rails (linode/slicehost) and mod_rails passenger