One more thing: another excerpt from top:

Cpu0  : 44.7%us, 55.3%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 41.9%us, 57.1%sy,  0.0%ni,  0.3%id,  0.0%wa,  0.0%hi,  0.7%si,  0.0%st
Mem:   2074408k total,  1798304k used,   276104k free,   109520k buffers
Swap:  1052248k total,   461136k used,   591112k free,   494596k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
22743 sean      20   0 11156  788  664 R  186  0.0   0:06.08 multicore

Of course, it's not always exactly like this excerpt, but it's generally
close.. I thought that code would use both cores at (or near) 100%.

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Multithreading not utilizing both cores
https://bugs.launchpad.net/bugs/139631
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