We are running a website with ROR on CentOS 6 with 2 web server and 1 database server. Some times it shows message "The website is under heavy load"... Can some plese help you what to check here.
We are using Passenger 4.0.21 with Ruby 1.8.7 and Apache 2.2.15. Web server is running with the default settings.
Below is some output of passenger-status:
# passenger-status
Version : 4.0.21
Date : Thu Dec 12 02:02:44 -0500 2013
Instance: 20126
----------- General information -----------
Max pool size : 6
Processes : 6
Requests in top-level queue : 0
----------- Application groups -----------
/home/web/html#default:
App root: /home/web/html
Requests in queue: 100
* PID: 20290 Sessions: 1 Processed: 53 Uptime: 24h 3m 5s
CPU: 0% Memory : 634M Last used: 23h 16m 8
* PID: 22657 Sessions: 1 Processed: 37 Uptime: 23h 15m 55s
CPU: 0% Memory : 609M Last used: 22h 44m
* PID: 29147 Sessions: 1 Processed: 146 Uptime: 20h 47m 48s
CPU: 0% Memory : 976M Last used: 18h 20m
* PID: 22216 Sessions: 1 Processed: 26 Uptime: 10h 3m 19s
CPU: 0% Memory : 538M Last used: 9h 44m 4
* PID: 23306 Sessions: 1 Processed: 75 Uptime: 9h 43m 22s
CPU: 0% Memory : 483M Last used: 8h 44m 4
* PID: 25626 Sessions: 1 Processed: 115 Uptime: 8h 46m 42s
CPU: 0% Memory : 540M Last used: 7h 59m 5