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I have installed Ubuntu 12.04 on a cloud server (based on VMWare). System start normaly with about 300MB of memory, after 20 minutes begin to load memory and i see 3GB of memory usage. I don't find which process use this memory, i have tried with htop too. Any idea ?

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What is the output of free -m? –  Salem Nov 8 '13 at 22:58
this is my output total used free shared buffers cached Mem: 7986 2775 5210 0 26 100 -/+ buffers/cache: 2648 5338 Swap: 511 0 511 –  user212878 Nov 11 '13 at 16:59

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