Why do I run out of memory even when nothing is running?

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http://askubuntu.com – I am currently facing a problem that when I run Uclust, it keeps showing me mymalloc running ot of memory. The thing is that cuurently nothing is running in the system and my memory shows I am currently using only 1.7 GiB (3.6%) of my 47.3 GiB RAM. (HowTos)