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用TOP看，上面写的是对的，但具体就只有为数不多的进程，各占百分之几的内存

用FREE看，则内存占用达90％以上，实际运行中也觉得有一点卡

KiB Mem: 8149452 total, 8025672 used, 123780 free, 1031016 buffers

20 0 1248712 307988 66060 S 9.0 3.8 0:35.94 chromium-browse

20 0 1167540 169788 56144 S 1.0 2.1 0:24.27 chromium-browse

20 0 1853320 163876 78692 S 0.7 2.0 6:54.70 compiz

20 0 1449528 231212 100728 S 0.7 2.8 11:48.63 chromium-browse

20 0 1506044 82072 40724 S 0.7 1.0 4:56.23 ktorrent

20 0 1144436 117456 15884 S 0.7 1.4 2:10.66 chromium-browse

20 0 648252 34292 12352 S 0.3 0.4 0:37.58 unity-panel-ser

20 0 1054996 97092 35968 S 0.3 1.2 0:03.45 chromium-browse

Mem: 8149452 7996564 152888 157380 901476 4531972

-/+ buffers/cache: 2563116 5586336

Swap: 7811068 204 7810864