I just ran a benchmark test on my machine and noticed a big difference between different versions of gcc. I took gcc 2.95.3, 2.96-80 (current cooker version), and gcc3.0 (also from cooker). here are my results:
echo "GCC 2.95 performance:" GCC 2.95 performance: ./xmm_gcc ALGORITHM NB REPS TIME MFLOPS ========= ===== ===== ========== ========== atlasmm 60 1000 0.300 1440.00 echo "GCC 2.96-80 performance:" GCC 2.96-80 performance: ./xmm_ngc ALGORITHM NB REPS TIME MFLOPS ========= ===== ===== ========== ========== atlasmm 60 1000 0.590 732.20 echo "GCC 3.0 performance:" GCC 3.0 performance: ./xmm_gc3 ALGORITHM NB REPS TIME MFLOPS ========= ===== ===== ========== ========== atlasmm 60 1000 0.590 732.20 It it obvious that gcc 2.95.3 creates code that is twice as fast as the latter versions. I ran this test after reading this article: http://www.cs.utk.edu/~rwhaley/ATLAS/gcc30.html -Dave ------------------------------------------------------- ------------------------------------------------------- -------------------------------------------------------
