How to increase available RAM on machine
We have talked in length about RAM, memory leakage and how to calculate memory requirements. The question is, what shall we do if we run out of RAM/memory?
The word increasing RAM is actually a misnomer. We all know RAM comes in the form of a chip and that is fixed, when we say increasing memory/RAM we mean to increase the Virtual memory associated with RAM. We have already seen that when a system runs out of space it allots some of the RAM to virtual memory . So can you increase this virtual memory?
- Go to Start > Control Panel > System > Click on ‘Settings’ under Performance section.
- Now go to advanced tab. Click ‘Change’ under Virtual Memory section.
- Select the drive where your paging files reside. Generally they are present in C: drive. Change the value and click on ‘Set’.
The steps given above are for Windows XP professional. I believe steps for other OS will more or less be the same.
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How to calculate memory requirement for Vusers
Memory requirement also called as Memory footprint for a Vuser can be called as a function that is dependant on Vuser type (Web, CITRIX, SAP GUI); application and system where you
intend to run the test.
So if your Web/HTTP Vuser takes 5MB when running as a process, 50 Vusers would take 250 MB. Then remote desktop connection , third party program (that is continuously running in background) , memory consumed by application all summed will give you the memory requirement for a test.
You can calculate it empirically. Do it for say 10 Vusers and than extrapolate that requirement for x no of Vusers.
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