So, check that: cat /proc/cpuinfo shows two (or more in your case..) processors. If not, something must be wrong with kernel, or you may need to recompile kernel or at last, you need to use FC8 :P
cat /proc/cpuinfo shows 8 CPUs.
I will prefer to recompile kernel as Tally 7.2 for linux doesnt work on FC5+
Is there any debugging tool which I can use like Dtrace on Solaris ?