The ALLOC function does the heavy lifting, but that is inevitable: Only by walking the entire MCB chain can DOS coalesce all eligible memory and ensure that the largest free block is found. This means that calling the ALLOC function can be somewhat expensive if the MCB chain is long. In practice, there are unlikely to be more than a few dozen MCBs, even in a heavily loaded system.
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对国家自然科学基金委员会工作作出重要指示，提出“强化基础研究战略性、前瞻性、体系化布局”。
（作者单位：中国社会科学院考古研究所）