24 lines
989 B
Markdown
24 lines
989 B
Markdown
# What did work:
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## Removing a double calculation when step
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I changed `config[i] = 0.5*previous[i] + 0.25*previous[(i-1) % size]+ 0.25*previous[(i+1) % size];` to `config[i] = 0.5*previous[i] + 0.25*previous[(i-1) % size]*2;` in step
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This made all the improvement as far as i can tell
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## In shift_centre_to_origin compute the ratio before the for loop
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```
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const float ratio = sum/size;
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for(long i = 0; i < size; i++) config[i] -= ratio;
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```
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This did not make a noticable difference
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# What did not work and actually made it slower:
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- Trying to find a fancy way to get a random bool in stochastic_unit_step
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- Using the std::minmax_element function in elongation
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- Changing the step function to be a void that changed the array directly made it about 8 secounds slower
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# Compiler optimizations
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I treid these flags: -Ofast -march=native -flto -fno-signed-zeros -fno-trapping-math
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The improvements were in the margin of error
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# Speedup
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I got at best a 1.1 times speedup. See 12_speedup.png |