I thought it was interesting that OpenVMS runs my linpack benchmark 40% faster than HP-UX using gcc. Can anyone compile the code to make HP-UX catch up? See my web page for details:
http://www.polarhome.com:983/~jovan/linpack.html
Moderator: Moderators
SYSTEM@ia64$ gcc --version
GNV Nov 14 2011 17:57:59
HP C V7.3-020 on OpenVMS IA64 V8.4
SYSTEM@ia64$ mc <>linpack.exe
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
----------------------------------------------------
128 0.72 81.94% 9.72% 8.33% 266343.434
256 1.46 84.93% 2.74% 12.33% 274666.667
512 2.90 83.10% 1.03% 15.86% 288174.863
1024 5.82 82.65% 1.89% 15.46% 285831.978
2048 11.61 82.77% 2.58% 14.64% 283812.984
Enter array size (q to quit) [200]: q
SYSTEM@ia64$
bash-4.2# which cc
/usr/bin/cc
bash-4.2# what /usr/bin/cc
/usr/bin/cc:
HP C (bundled) for Integrity Servers B3910B A.06.12 [Oct 11 2006]
bash-4.2# ./linpack-cc
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 0.58 79.31% 1.72% 18.97% 187007.092
128 1.17 80.34% 2.56% 17.09% 181223.368
256 2.33 80.26% 1.29% 18.45% 185038.596
512 4.65 79.78% 2.58% 17.63% 183589.208
1024 9.32 80.04% 2.47% 17.49% 182872.995
2048 18.62 80.02% 2.31% 17.67% 183469.450
Enter array size (q to quit) [200]: q
bash-4.2#
bash-4.2# gcc --version
gcc (GCC) 4.2.3
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
bash-4.2# gcc -O3 -o linpack linpack.c -lm
bash-4.2# ./linpack
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
----------------------------------------------------
128 0.94 88.30% 2.13% 9.57% 206807.843
256 1.86 89.25% 3.23% 7.53% 204403.101
512 3.74 88.77% 2.67% 8.56% 205598.441
1024 7.48 89.17% 2.54% 8.29% 204999.028
2048 14.95 89.03% 2.74% 8.23% 204999.028
Enter array size (q to quit) [200]: q
bash-4.2# gcc -o linpack linpack.c -lm
bash-4.2# ./linpack
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
----------------------------------------------------
32 0.73 83.56% 4.11% 12.33% 68666.667
64 1.46 84.25% 3.42% 12.33% 68666.667
128 2.90 85.86% 2.41% 11.72% 68666.667
256 5.81 85.89% 2.41% 11.70% 68532.814
512 11.63 85.98% 2.49% 11.52% 68333.009
Enter array size (q to quit) [200]: q
bash-4.2#
bash-4.2# gcc -O1 -o linpack linpack.c -lm
bash-4.2# mv linpack linpack_O1
bash-4.2# gcc -O2 -o linpack linpack.c -lm
bash-4.2# mv linpack linpack_O2
bash-4.2# gcc -O3 -o linpack linpack.c -lm
bash-4.2# mv linpack linpack_O3
bash-4.2# gcc -Os -o linpack linpack.c -lm
bash-4.2# mv linpack linpack_Os
bash-4.2# gcc -o linpack linpack.c -lm
bash-4.2# ./linpack_O1
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
----------------------------------------------------
128 0.94 84.04% 1.06% 14.89% 219733.333
256 1.88 84.57% 1.60% 13.83% 217020.576
512 3.75 87.47% 3.47% 9.07% 206201.369
1024 7.51 87.75% 2.40% 9.85% 207724.274
2048 15.01 86.81% 2.80% 10.39% 209114.250
Enter array size (q to quit) [200]: q
bash-4.2# ./linpack_O2
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
----------------------------------------------------
128 0.95 86.32% 3.16% 10.53% 206807.843
256 1.89 88.36% 2.12% 9.52% 205598.441
512 3.79 87.86% 2.90% 9.23% 204403.101
1024 7.57 87.71% 2.77% 9.51% 205298.297
2048 15.16 87.93% 2.70% 9.37% 204700.631
Enter array size (q to quit) [200]: q
bash-4.2# ./linpack_O3
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
----------------------------------------------------
128 0.94 88.30% 5.32% 6.38% 199757.576
256 1.86 88.71% 3.23% 8.06% 205598.441
512 3.74 88.77% 2.94% 8.29% 204999.028
1024 7.48 89.17% 2.27% 8.56% 205598.441
2048 14.95 88.76% 2.74% 8.49% 205598.441
Enter array size (q to quit) [200]: q
bash-4.2# ./linpack_Os
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 0.54 85.19% 3.70% 11.11% 183111.111
128 1.06 89.62% 2.83% 7.55% 179374.150
256 2.11 88.63% 3.32% 8.06% 181223.368
512 4.23 89.13% 2.84% 8.04% 180757.498
1024 8.48 88.80% 2.95% 8.25% 180757.498
2048 16.94 89.20% 2.48% 8.32% 181106.675
Enter array size (q to quit) [200]: q
bash-4.2# ./linpack
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
----------------------------------------------------
32 0.73 83.56% 4.11% 12.33% 68666.667
64 1.46 84.93% 1.37% 13.70% 69756.614
128 2.90 84.83% 2.76% 12.41% 69207.349
256 5.81 85.71% 2.24% 12.05% 68801.044
512 11.63 85.21% 2.32% 12.47% 69071.382
Enter array size (q to quit) [200]: q
bash-4.2#
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