Increase Load on Linux/Unix for testing purposes

[1]
echo "9999999999^999999" | bc
Performing calculation of large numbers. Heavy on CPU usage

[2]
- tool to impose load on and stress test systems
Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 4000M --timeout 30s
To install package on Unbuntu 9.10: apt-get install stress