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static double get_use_cost(uint32_t *buffer, uint32_t nkeys, uint32_t key_size,
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size_t max_in_memory_size);
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inline static int get_cost_calc_buff_size(ulong nkeys, uint32_t key_size,
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register size_t max_elems_in_tree=
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return (int) (sizeof(uint32_t)*(1 + nkeys/max_elems_in_tree));