13.4.4. Scaling Action Hooks

...
# Scale up when any gear is using 400M or more memory.
mem_scale_up = 419430400

# Scale down when any gear is using 300M or less memory
mem_scale_down = 314572800

# min_gears - Once this number of gears is met, don't try to scale down any lower
min_gears = 2

gear_list['web'].each do |uuid, array|
 mem_usage = `ssh -i ~/.openshift_ssh/id_rsa #{uuid}@#{array['dns']} 'oo-cgroup-read memory.memsw.usage_in_bytes'`.to_i
 if mem_usage >= mem_scale_up
   @log.error("memory usage (#{mem_usage}) on #{array['dns']} is above threshold(#{mem_scale_up}), adding new gear")
   self.add_gear
 end
end

...
# Scale up when any gear is using 400M or more memory.
mem_scale_up = 419430400

# Scale down when any gear is using 300M or less memory
mem_scale_down = 314572800

# min_gears - Once this number of gears is met, don't try to scale down any lower
min_gears = 2

gear_list['web'].each do |uuid, array|
 mem_usage = `ssh -i ~/.openshift_ssh/id_rsa #{uuid}@#{array['dns']} 'oo-cgroup-read memory.memsw.usage_in_bytes'`.to_i
 if mem_usage >= mem_scale_up
   @log.error("memory usage (#{mem_usage}) on #{array['dns']} is above threshold(#{mem_scale_up}), adding new gear")
   self.add_gear
 end
end