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Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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Created by Malachy Moran-Tun
over 2 years ago
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Copied by Malachy Moran-Tun
over 2 years ago
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Copied by Malachy Moran-Tun
over 2 years ago
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| Question | Answer |
| What is Paging? | > Splits RAM into small, physical sections (4Kb on 64-bit architecture) known as pages > Items in RAM are allocated a set number of pages to run in > Crucially, these items CAN be split across lots of pages that are non-contiguous (not all together) > Addresses of pages are stored in a page table > Each page is managed by a table map to keep track of which page belongs to which item |
| How does Paging affect Performance? | > Performance is not affected by having non-contiguous pages for items in RAM > Unused / inactive pages can be sent to virtual memory to free up pages for other tasks > Using virtual memory can lead to disk thrashing |
| What is Segmentation? | > No physical split, unlike paging > Splits RAM into a logical division of segments with varying lengths > Items in RAM are given enough memory for parts they initially load > The remaining part of the item is kept in storage until needed, but the logical division will need to be made bigger when the rest of the item is loaded |
| How does Segmentation affect Performance? | > Items split across non-contiguous, logical splits severely impact performance > Segmentation can still utilise virtual memory to store unused parts of programs |
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