Apache2 and mysql-server consume maximum physical memory

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http://serverfault.com – i am using ubuntu 12.04LTS on my linode vps include core2 cpu, 2gb RAM. I am doing a lot of research on optimizing memory for mysql and apache process -> optimize apache memory use, there i am using two scripts for compute memory per process. Here is the output of total memory usage : Total used by apache2 (150 instances): 0.67G Total used by other > processes: 0.21G > > Average memory used per apache2 process: 4.57M Recommended number of > processes based on Average: 395 Needed memory for 500 processes based > on Average: 2.23G > > Max memory used for apache2 p (HowTos)