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The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux , although some variants of the latter can overcome this barrier. [ 2 ]
Similar displays in the Task Manager of Windows Vista and later have been changed to reflect usage of physical memory. In Task Manager's "Processes" display, each process's contribution to the "total commit charge" is shown in the "VM size" column in Windows XP and Server 2003. The same value is labeled "Commit size" in Windows Vista and later ...
Many 32-bit computers have 32 physical address bits and are thus limited to 4 GiB (2 32 words) of memory. [3] [4] x86 processors prior to the Pentium Pro have 32 or fewer physical address bits; however, most x86 processors since the Pentium Pro, which was first sold in 1995, have the Physical Address Extension (PAE) mechanism, [5]: 445 which allows addressing up to 64 GiB (2 36 words) of memory.
Memory limits on 32-bit editions of Microsoft Windows, with PAE support [17] [18] [19] Windows version Memory limit Windows 2000 Professional, Server 4 GB Windows 2000 Advanced Server 8 GB Windows 2000 Datacenter 32 GB Windows XP Starter 0.5 GB Windows XP (other editions) 4 GB Windows Server 2003 Web SP2 2 GB Windows Server 2003 Standard SP2 4 GB
MSDN Article: Memory Limits for Windows Releases; The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed – explains the issue; Windows Vista SP1 includes reporting of Installed System Memory (RAM) – details about the RAM limit
DLL hell was a very common phenomenon on pre-Windows NT versions of Microsoft operating systems, the primary cause being that the 16-bit operating systems did not restrict processes to their own memory space, thereby not allowing them to load their own version of a shared module that they were compatible with.
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Memory protection is a way to control memory access rights on a computer, and is a part of most modern instruction set architectures and operating systems.The main purpose of memory protection is to prevent a process from accessing memory that has not been allocated to it.