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computational program spending lot of time in kernel

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Hi,

I have got a problem: I have tried to run old large Fortran code
(compiled with fort -fast) and have noticed that it is unexpectedly slow.
Closer investigation revealed that it spends more than 50% of CPU time in
kernel. I suspect that the program does some kind of ugly floating point
operations that require kernel support. The final numbers appear to be
correct (compared against other architecture).

Does anybody has ANY advice how to approach this problem? Is there any
way to find out the offending part of code? I thought I could run gprof
but I am not sure it show up in the output time spent in kernel..

/Pawel

-- 
Pawel Salek (pawsa@theochem.kth.se) http://www.theochem.kth.se/~pawsa/
Theoretical Chemistry Division, KTH voice: +46 8 790-8202
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