Question

what is logical memory???

Answer 1

Theres Physical Memory and logical memory, physical memory obviously is the one physically attached to your computer, like in Hardrives or RAM Cards. Logical memory is more like the Virtual Memory Windows OS have, it works like the physical memory, in this case the RAM one, but is not, it is logically stablished, doesn't have a physical allocation of is own, except the one that is in the Physical Hard Drive Disk that takes X quantity of memory space (bytes, mb, gB)

Answer 2

physical memory is something that you can see..it is called as main memory
but logical memory is that memory that you cannot see but stil you use to increase the efficiency of the system.logical memory examples can be pages,segments...
it is said that our program when executed,if it does not have enough space in the main memory or the cache is divided into pages.each page is placed in a segment called page.
similarly segment too....so this cannot be seen but stil used to increse the efficiency of your system

Answer 3

Do not mistake "logical memory" with "virtual memory". Logical memory is the way your software perceives the memory you have, while the physical memory is the actual amount of memory you have physically installed on your computer. For example, your computer has two 2GB memory modules installed. So, you have 4GB of physical memory. Windows, for example, usually uses your hard disk to increase "memory", allocating data in memory into a temporary space in your hard disk. That is called virtual memory. When you are writing a software, the operating system will show you memory pointers to the entire range of memory it is actually using, including virtual memory. Therefore, logical memory is actually the amount of memory your operating system is actually addressing, or in other words, working with. In the case above, you would have 4GB of physical memory plus, let say, 2GB of virtual memory Windows is temporarily allocating in the hard disk, so you would have 6GB of logical memory being addressed.

The example above is based on Windows. If you take virtualization into account, for example, you might have 4GB of physical memory in a computer, however, since your virtual machine might only be using a fraction of it, suppose 50% and no virtual memory, you would have a logical memory of 2GB for that virtual machine.