Lubuntu 14.04, cpufreq max 1200MHz で実行

$ wget -O linpack.c http://www.netlib.org/benchmark/linpackc.new

$ gcc-4.8 -Ofast -o ofast linpack.c

$ ./ofast
Enter array size (q to quit) [200]:
Memory required: 315K.


LINPACK benchmark, Double precision.
Machine precision: 15 digits.
Array size 200 X 200.
Average rolled and unrolled performance:

Reps Time(s) DGEFA DGESL OVERHEAD KFLOPS
----------------------------------------------------
64 0.62 89.67% 2.87% 7.46% 152457.604
128 1.25 89.68% 2.86% 7.46% 152525.333
256 2.49 89.67% 2.86% 7.47% 152549.754
512 4.98 89.67% 2.87% 7.47% 152529.237
1024 9.96 89.66% 2.87% 7.47% 152530.859
2048 19.93 89.67% 2.87% 7.46% 152534.366