hw04 #18
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hw04 #18
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-O3 -ffast-math -march=native似乎没有在CMakeLists.txt中写对。于是这次实验在cmd里编译的。
什么都不开: g++ main.cpp -o main
Initial energy: -8.571527
Final energy: -8.511589
Time elapsed: 21081 ms
开启优化编译选项：g++ -O3 -ffast-math -march=native main.cpp -o main
Initial energy: -8.571528
Final energy: -8.511649
Time elapsed: 1670 ms
做了一些人工的优化：
Initial energy: -8.571528
Final energy: -8.562015
Time elapsed: 917 ms
包括：struct填充至32字节；Gdt, epseps提到循环外；先累加到局部变量，再赋给AOS。
有点遗憾没在win下调好CMakeLists，然后omp simd没有感受到。