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Why are items limited to 1 megabyte in size in Memcache? - PHP
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Memcached's memory storage engine, uses a slabs approach to memory management. Memory is broken up into slabs chunks of varying sizes, starting at a minimum number and ascending by a factorial up to the largest possible value.
Say the minimum value is 400 bytes, and the maximum value is 1 megabyte, and the factorial is 1.20:
slab 1 - 400 bytes slab 2 - 480 bytes slab 3 - 576 bytes ... etc.
The larger the slab, the more of a gap there is between it and the previous slab. So the larger the maximum value the less efficient the memory storage is. Memcached also has to pre-allocate some memory for every slab that exists, so setting a smaller factorial with a larger max value will require even more overhead. |
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By Rekha, On - 2010-04-24 |
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