I’ve got a server to host a basic Rails app ( < 2MB in total size). The
server is running Apache 2.2.14 and Passenger 2.2.7
Testing on my web server goes like this:
Apache stopped: 8% memory allocated (of 1GB)
Apache started: 51% memory now allocated, ~400MB gets allocated after
Visit my server to look at my app: memory allocation goes from 51% to
90% from just that one request, causes a 10 second delay on the first
page load, spikes CPU use up to 100% for a number of seconds, and memory
allocation sits at 90%.
The site is then really responsive and runs fine. Once passenger
processes start to time out due to inactivity memory allocation goes
back down to 51%.
Re-visit app after an hour or so: Another large sustained spike in
memory use, short burst of CPU use
Is this normal? I’ve tried to find some good resources on Passenger +
Apache and memory use yet nothing really seems to explain both why
passenger sucks up every drop of available memory and how to limit the
memory passenger consumes.