This article from AMD (warning: PDF) discusses 64-vs-32 bits in some detail. The varnish http cache is a prime example of this. This affects not just "real ram", but their entire virtual address space.which is a particular problem if applications plan to make extensive use of virtual memory via mmap() or other techniques. While you can get your 32bit kernel to address more than 4GB of RAM, individual processes will still be limited to 4GB. The biggest is, as you say, the ability to address large amounts of memory. There are a number of advantages to running in a 64 bit environment. Are there any benefits or disadvantages between 64-bit and 32-bit virtualization, except theĤ gigabyte memory limit on 32-bit machines.
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