Asus A7M266 motherboard (AMD760 chipset), 1.2 GHz AMD Athlon (FSB266), 512 MB DDR SDRAM (2-2-2), Windows NT4/SP6, Compaq Visual Fortran 6.5a, df -arch:p6 ---------------------------------------------- Double precision appears to have 16 digits of accuracy Assuming 8 bytes per DOUBLE PRECISION word ---------------------------------------------- Array size = 18901234 Offset = 0 The total memory requirement is 432 MB You are running each test 10 times The *best* time for each test is used ---------------------------------------------------- Your clock granularity/precision appears to be 10000 microseconds The tests below will each take a time on the order of 360000 microseconds (= 36 clock ticks) Increase the size of the arrays if this shows that you are not getting at least 20 clock ticks per test. ---------------------------------------------------- WARNING -- The above is only a rough guideline. For best results, please be sure you know the precision of your system timer. ---------------------------------------------------- Function Rate (MB/s) RMS time Min time Max time Copy: 916.4235 0.3360 0.3300 0.3400 Scale: 795.8414 0.3860 0.3800 0.3900 Add: 945.0617 0.4860 0.4800 0.4900 Triad: 872.3646 0.5200 0.5200 0.5200 Sum of a is = 2.179880794155460E+019 Sum of b is = 4.359761588853745E+018 Sum of c is = 5.813015448553570E+018