| 21. | One more issue is that some complex instructions are difficult to restart, e . g . following a page fault.
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| 22. | If a page is on disk, a page fault occurs and the operating system brings the page into primary storage.
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| 23. | If a program later references the evicted page, another page fault occurs and the page must be read back into RAM.
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| 24. | If the memory access time is 0.2 ?s, then the page fault would make the operation about 40, 000 times slower.
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| 25. | So if a page fault occurs, the OS can load the page from disk and then simply re-execute the faulted instruction.
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| 26. | When I click on Details it says, " RNAAPP caused an invalid page fault in module unknown at 0000 : 575c34a43.
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| 27. | A " page fault " occurs when a page is not found, and might need to be loaded from disk into memory.
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| 28. | The operating system intercepts the page fault, loads the required memory page, and the application continues as if no fault had occurred.
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| 29. | Major page faults on conventional computers ( which use hard disk drives for storage ) can have a significant impact on performance.
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| 30. | When a page fault occurs and all frames are in use, one must be cleared to make room for the new page.
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