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add numa related questions
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kernel.txt

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11、匿名页面和文件缓冲页面有什么区别?
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12、解释下什么是 NUMA?
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(tips:传统的总线模型,在CPU数量增多时,对应的总线长度越来越长,
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位置靠后的CPU访存延迟增高)
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13、使用哪个命令来查看NUMA信息?
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(tips:numactl命令)
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14、/proc/interrupts 文件内容解释?
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