CPU instruction is driven by the Linux kernel. Not any packages you install. I'm genuinely just trying to understand how you can claim you are using added cores when I see no evidence of that...
if you run 'top' and press '1'. It will list individual cores, as follows:
top - 13:25:01 up 20 days, 6:35, 1 user, load average: 0.05, 0.02, 0.00
Tasks: 292 total, 1 running, 291 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.1%us, 0.0%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.4%us, 0.1%sy, 0.0%ni, 99.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 0.1%us, 0.0%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.1%us, 0.1%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 0.1%us, 0.0%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 : 0.2%us, 0.1%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 0.1%us, 0.0%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.4%us, 0.1%sy, 0.0%ni, 99.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3924032k total, 1496160k used, 2427872k free, 331848k buffers
Swap: 10289144k total, 0k used, 10289144k free, 699296k cached
I only see Cpu0 in your images...