| 1. | Typically, an operating system assigns each program its own virtual address space.
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| 2. | The original implementations had a single virtual address space, shared by all jobs.
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| 3. | Each context had its own virtual address space.
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| 4. | Each such entry describes up to 1MB ( 256KW ) of virtual address space.
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| 5. | They only use as many as needed to provide the virtual address space required.
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| 6. | This is a count of physical memory ( RAM ) rather than virtual address space.
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| 7. | The operating system manages virtual address spaces and the assignment of real memory to virtual memory.
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| 8. | A similar but less effective method is to rebase processes and libraries in the virtual address space.
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| 9. | This is still approximately 64, 000 times the virtual address space of 32-bit machines.
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| 10. | Architectures that survived evolved over time to support larger virtual address spaces using memory segmentation or other mechanisms.
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