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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
first fit
A resource allocation scheme that searches a list of
free resources and returns the first one that can satisfy the
request.
For example, when allocating memory from a list of free blocks (a
heap), first fit scans the list from the beginning until it
finds a block which is big enough to satisfy the request. The
requested size is allocated from this block and the rest of the
block returned to the free pool.
First fit is faster than a best fit scheme, but results in more
fragmentation of the free space because it is more likely to
split up a large free block when a smaller block could have been
used.
(2015-01-31)