Memory leak plan

memory_plan.txt

memory plan:
============

- SSH to server
- add rbtrace (require: false) to gemfile, bundle install
- change passenger to only run 1 instance (via json config file)
- add this to before filter in applicaton_controller.rb:
  require 'rbtrace'
- add this to application.rb:
  require 'objspace'
  ObjectSpace.trace_object_allocations_start
- start passenger (normal way - from deploy/scripts/application_start.sh)
- let server take some traffic
- take memory dump!
  bundle exec rbtrace -p $PASSENGER_PID -e 'Thread.new{GC.start;require "objspace";io=File.open("./tmp/ruby-heap-#{DateTime.now.asctime}.dump", "w"); ObjectSpace.dump_all(output: io); io.close}'
- wait a bit and do the same thing a couple times
- comment out changes in application.rb, restart passenger again so that it's no longer in slow-mo (#trace_allocations_start slows things down)
- run dumps through analyzers like sam saffron's https://samsaffron.com/archive/2015/03/31/debugging-memory-leaks-in-ruby
- ???? hopefully that gives enough of a breadcrumb trail to figure out next steps

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