【资料整理】对linux内存的理解
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$ free -m
total used free shared buffers cached
Mem: 32127 24572 7555 0 478 16258-/+ buffers/cache: 7835 24292
Swap: 20479 97 20382注意第2行：实际被程序占用的内存：-buffers/cache=7835
(used-buffers-cached) 24572-478-16258=7836实际可用内存总数：+buffers/cache=24292
(free+buffers+cached) 7555+478+16258=24291
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再来一例：
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$ free -m
total used free shared buffers cached
Mem: 64186 619 63567 0 16 93-/+ buffers/cache: 509 63677
Swap: 32159 0 32159实际被程序占用的内存：-buffers/cache=509
(used-buffers-cached) 619-16-93=510实际可用内存总数：+buffers/cache=63677
(free+buffers+cached) 63567+16+93=63676
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本文转自 pcnk 51CTO博客，原文链接：http://blog.51cto.com/nosmoking/1595978，如需转载请自行联系原作者