When moving from a 32-bit to a 64-bit server, will apps take more memory on 64-bit machines because of the increased dataspace?
The answer is YES apps will use more memory on a 64 bit OS, but not because of the dataspace, but for other reasons.
- memory pointesr now take up 8 bytes instead of 4
- typically applications load 32 bit binaries as well as 64 bit native binaries
Note that we're not talking about vast quatities of overhead, we're talking about 100MB range, but its important to think about that in a Virtual Desktop environment, especially when you think you will be deploying hundreds of VMs