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Definition of "fragmentation" |
The subdivision of a grain into small discrete crystallites outlined by a heavily deformed network of intersecting slip bands as a result of cold working. These small crystals or fragments differ from one another in orientation and tend to rotate to a stable orientation detemined by the slip systems. / waste of memory space when allocating memory segments for processes. Internal fragmentation occurs when memory blocks are rounded up to fix block sizes, e.g., allocated in sizes of power of 2 only. E.g., if 35 K of data is allocated a 64 K block, the difference (64 − 35 = 29K) is wasted. External fragmentation occurs between allocated segments, as a result of allocating different sized segments for processes entering and leaving memory. This latter fragmentation is also called checkerboarding. |
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