SharePoint 2007 and 2012 are memory monsters, also the SQL Server. SharePoint and SQL Server combination on a production server gave so many sleepless nights and nightmares in day time to many IT Pros. One of the application I was building in the past also had many problems related to memory. After drilling down into the roots I found that much of the processor and memory is occupied by SharePoint i.e ASP.Net i.e w3p.exe.
Read More:http://www.shailwx.com/2012/07/sharepoint-2013-net-framework-4-0-and-garbage-collection/
Aryan Nava 
thank for the shared information
its nice.