【资料整理】对linux内存的理解

$ free -m             total       used       free     shared    buffers     cachedMem:         32127      24572       7555          0        478      16258-/+ buffers/cache:       7835      24292Swap:        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

再来一例：

$ free -m             total       used       free     shared    buffers     cachedMem:         64186        619      63567          0         16         93-/+ buffers/cache:        509      63677Swap:        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