似乎考虑到列出的进程的内存百分比，我的服务器不应达到 98% 的内存使用率。为什么累积内存使用率这么高？
top - 14:34:50 up 14 days, 22:54, 3 users, load average: 0.00, 0.01, 0.05
Tasks: 139 total, 1 running, 138 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.1 us, 0.0 sy, 0.0 ni, 99.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 32949428 total, 32566440 used, 382988 free, 604072 buffers
KiB Swap: 0 total, 0 used, 0 free. 31047712 cached Mem
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5897 …