What is 50 percent rule ?

50 percent rule :

Depending on the total amount of memory storage and the average process size, external fragmentation may be a minor or a major problem. Statistical analysis of first fit, for instance, reveals that, even with some optimization, given N allocated blocks, another N/2 blocks will be lost to fragmentation. That is, one-third of memory may be unusable. This property is known as the 50 percent rule.

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