page-fault

segmentation fault vs page fault

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These two things are very dissimilar, actually. A segmentation fault means a program tried to access an invalid or illegal memory address: for example, 0, or a value larger than any valid pointer. A page fault is when a pointer tries to access a page of address space that’s currently not mapped onto physical memory, … Read more

Can’t understand Belady’s anomaly

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The reason that when using FIFO, increasing the number of pages can increase the fault rate in some access patterns, is because when you have more pages, recently requested pages can remain at the bottom of the FIFO queue longer. Consider the third time that “3” is requested in the wikipedia example here: http://en.wikipedia.org/wiki/Belady%27s_anomaly Page … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)