Linux memory problems

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http://stackoverflow.com – I am running two programs.. First program is written by c++ and Another program is written by java. Two programs need much memory. But program's memory usage reaches 26.1~26.2%, it does not increase any more and the two programs get very slow.. and i tried to use -xms -xmx arguments in java but it does not effect!.(it means the memory usage reaches 26.1~26.2% and then it does not increase any more.) What could be the problem? thanks for reading. Tasks: 126 total, 1 running, 125 sleeping, 0 stopped, 0 zombie Cpu(s): 97.5%us, 0.4%sy, 0.0%ni, 2.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st (HowTos)