I lost the password to open a PDF file I need to access, so I installed pdfcrack with the hope to recover my password. Actually it's one month that pdfcrack is running but I still am waiting for the result.
Looking at system monitor I noted that pdfcrack is using just one core of my CPU, the other 7 are idle. Is there a way to assign to pdfcrack more than one core to use? I'm using Ubuntu 12.04LTS 32-bit.