Code breaking on PS3 Xubuntu

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http://www.linuxforums.org – I needed to recover an old PDF password (I have found it now), and decided to try it on the PS3. I've installed Xubuntu on it and I am using PDFcrack. The problem is that I only get like half the cracking speed that I get on my very old laptop. So obviously I am not using the full power of the PS3. Xubuntu seems to only recognize 2 of the Cell-cores, when I look in the resource monitor. What should I do to take advantage of the Cell-processor? Whould it help if I used YDL instead? (HowTos)