Restart httpd when it is eating memory

gistfile1.rb

#!/bin/env ruby

require 'rubygems'
require 'pony'

# total memory used
total_memory_used = `free | awk '$1=="Mem:" {print $3 / $2 * 100}'`.to_i

# active memory used
used = `awk '$1=="Active:"{active=$2}$1=="MemTotal:"{total=$2}END{print active/total * 100}' /proc/meminfo`.to_i

acceptable = 75

if used > acceptable
  timestamp = Time.now.strftime("%d/%b/%Y:%H:%M:%S")

  top_pids = `ps -eo pmem,pid,user,args | sort -r | grep apache | head -3 | awk '{printf $2 " "}' | xargs echo`

#  top_ten_pids = `ps -eo pmem,pid,user,args,etime,ppid,rss | sort -r | grep apache | head`
  top_ten_pids = `ps -eo pmem,pid,user,args,etime,ppid,rss | sort -r `

  log_marker = "==== Apache Restarted by restart_httpd_when_eating_memory #{top_pids} @ [#{timestamp}] ===="

  [ '/var/log/httpd/main-access.log',
    '/var/log/httpd/main-error.log',
    '/var/log/php-error.log'
  ].each{ |log|
    `echo "#{log_marker}" >> #{log}`
  }

  `/sbin/service httpd restart`

  message ="

#{timestamp}

httpd on the web node has been restarted

#{total_memory_used}% of total memory was in use

#{used}% of memory was active

#{acceptable}% is the current active memory threshold

__all processes, sorted by memory usage__
#{top_ten_pids}

"

  Pony.instance_eval{
    @sendmail_binary = '/usr/sbin/sendmail'
  }

  Pony.mail(:to => '[email protected],[email protected]', :from => '[email protected]', :subject => 'httpd restarted on web server', :body=>message)

end