I have a multisite Drupal based magazine sites and I would like to know is how can I choose the optimal memory limit to be set so that maximum numbers of users can access the site without affecting the speed and the server is also able to handle the requests.
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I got the solution to it. Install Devel Module. Enable settings for memory usage per page and execution time.
Measure the 2 parameters on different pages.
This shall give a fair idea of the execution time and memory limit settings.