gistfile1.txt

Xeon L5630:~$ for i in {0..7}; do sudo /usr/bin/cpufreq-set -g userspace -c $i; done
Xeon L5630:~$ for i in {0..7}; do sudo /usr/bin/cpufreq-set -f 1600 -c $i; done
Xeon L5630:~$ for i in 1 2; do perf stat -e cycles,instructions,cache-references,cache-misses,stalled-cycles-frontend,stalled-cycles-backend,LLC-loads,LLC-load-misses ./test$i; sleep 3; done
16777216

 Performance counter stats for './test1':

       12364612599 cycles                    [50.03%]
       20176026807 instructions              #    1.63  insns per cycle
                                             #    0.34  stalled cycles per insn [62.54%]
           8838679 cache-references                                             [62.56%]
           4413207 cache-misses              #   49.931 % of all cache refs     [62.57%]
        6949306494 stalled-cycles-frontend   #   56.20% frontend cycles idle    [62.57%]
         232268078 stalled-cycles-backend    #    1.88% backend  cycles idle    [62.52%]
             79215 LLC-loads                                                    [49.94%]
             16883 LLC-load-misses           #   21.31% of all LL-cache hits    [49.92%]

       7.758160333 seconds time elapsed

16777216

 Performance counter stats for './test2':

       16613859654 cycles                    [50.02%]
       20190257589 instructions              #    1.22  insns per cycle
                                             #    0.55  stalled cycles per insn [62.52%]
         148455264 cache-references                                             [62.51%]
          91421134 cache-misses              #   61.582 % of all cache refs     [62.52%]
       11055174602 stalled-cycles-frontend   #   66.54% frontend cycles idle    [62.52%]
        3057101167 stalled-cycles-backend    #   18.40% backend  cycles idle    [62.48%]
         138648427 LLC-loads                                                    [49.98%]
          86206769 LLC-load-misses           #   62.18% of all LL-cache hits    [50.00%]

      10.437229621 seconds time elapsed

Xeon L5630:~$ for i in {0..7}; do sudo /usr/bin/cpufreq-set -g performance -c $i; done
Xeon L5630:~$ for i in 1 2; do perf stat -e cycles,instructions,cache-references,cache-misses,stalled-cycles-frontend,stalled-cycles-backend,LLC-loads,LLC-load-misses ./test$i; sleep 3; done
16777216

 Performance counter stats for './test1':

       12387772412 cycles                    [50.01%]
       20194330128 instructions              #    1.63  insns per cycle
                                             #    0.34  stalled cycles per insn [62.50%]
           8439048 cache-references                                             [62.50%]
           4226535 cache-misses              #   50.083 % of all cache refs     [62.50%]
        6954956426 stalled-cycles-frontend   #   56.14% frontend cycles idle    [62.51%]
         238302493 stalled-cycles-backend    #    1.92% backend  cycles idle    [62.50%]
             42524 LLC-loads                                                    [50.04%]
             25812 LLC-load-misses           #   60.70% of all LL-cache hits    [50.00%]

       5.504984168 seconds time elapsed

16777216

 Performance counter stats for './test2':

       21290324064 cycles                    [49.95%]
       20194301356 instructions              #    0.95  insns per cycle
                                             #    0.77  stalled cycles per insn [62.46%]
         136039599 cache-references                                             [62.48%]
         119467792 cache-misses              #   87.818 % of all cache refs     [62.56%]
       15608529500 stalled-cycles-frontend   #   73.31% frontend cycles idle    [62.58%]
        6629117392 stalled-cycles-backend    #   31.14% backend  cycles idle    [62.55%]
         126630726 LLC-loads                                                    [50.00%]
         114571394 LLC-load-misses           #   90.48% of all LL-cache hits    [49.95%]

       9.431040798 seconds time elapsed

Xeon L5630:~$