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→Assignment 2
Another challenge we were presented with was getting nvcc to compile and link in 64-bit while using our static 32-bit SFML libraries. We ended up reverting to a dynamic-linking version of SFML and a 32-bit version of our executable. This change is only temporary until we can safely and more stably compile SFML and all of it’s dependencies''' '''using a 64-bit architecture.
==== Code ====
===== Old CPU Code =====
<div style='color:#000020;background:#f6f8ff;'>
<span style='color:#200080; font-weight:bold; '>void</span> Simulation<span style='color:#406080; '>::</span>Tick<span style='color:#308080; '>(</span><span style='color:#200080; font-weight:bold; '>double</span> dt<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
<span style='color:#003060; '>size_t</span> i <span style='color:#308080; '>=</span> <span style='color:#008c00; '>0</span><span style='color:#308080; '>,</span> j <span style='color:#308080; '>=</span> <span style='color:#008c00; '>0</span><span style='color:#406080; '>;</span>
<span style='color:#200080; font-weight:bold; '>for</span><span style='color:#308080; '>(</span>i <span style='color:#308080; '>=</span> <span style='color:#008c00; '>0</span><span style='color:#406080; '>;</span> i <span style='color:#308080; '><</span> bodies_<span style='color:#308080; '>.</span>size<span style='color:#308080; '>(</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span> <span style='color:#308080; '>+</span><span style='color:#308080; '>+</span>i<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
bodies_<span style='color:#308080; '>[</span>i<span style='color:#308080; '>]</span><span style='color:#308080; '>.</span>ResetForce<span style='color:#308080; '>(</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span>
<span style='color:#200080; font-weight:bold; '>for</span><span style='color:#308080; '>(</span>j <span style='color:#308080; '>=</span> <span style='color:#008c00; '>0</span><span style='color:#406080; '>;</span> j <span style='color:#308080; '><</span> bodies_<span style='color:#308080; '>.</span>size<span style='color:#308080; '>(</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span> <span style='color:#308080; '>+</span><span style='color:#308080; '>+</span>j<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
<span style='color:#200080; font-weight:bold; '>if</span><span style='color:#308080; '>(</span>i <span style='color:#308080; '>!</span><span style='color:#308080; '>=</span> j<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
bodies_<span style='color:#308080; '>[</span>i<span style='color:#308080; '>]</span><span style='color:#308080; '>.</span>AddForce<span style='color:#308080; '>(</span>bodies_<span style='color:#308080; '>[</span>j<span style='color:#308080; '>]</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
<span style='color:#200080; font-weight:bold; '>for</span><span style='color:#308080; '>(</span>i <span style='color:#308080; '>=</span> <span style='color:#008c00; '>0</span><span style='color:#406080; '>;</span> i <span style='color:#308080; '><</span> bodies_<span style='color:#308080; '>.</span>size<span style='color:#308080; '>(</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span> <span style='color:#308080; '>+</span><span style='color:#308080; '>+</span>i<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
bodies_<span style='color:#308080; '>[</span>i<span style='color:#308080; '>]</span><span style='color:#308080; '>.</span>Tick<span style='color:#308080; '>(</span>dt<span style='color:#308080; '>)</span><span style='color:#406080; '>;</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
</div>
===== Updated Kernel Code =====
<div style='color:#000020;background:#f6f8ff;'>
<span style='color:#200080; font-weight:bold; '>void</span> __global__ SimCalc<span style='color:#308080; '>(</span>BodyArray a<span style='color:#308080; '>)</span><span style='color:#406080; '>{</span>
<span style='color:#200080; font-weight:bold; '>int</span> idx <span style='color:#308080; '>=</span> blockIdx<span style='color:#308080; '>.</span>x <span style='color:#308080; '>*</span> blockDim<span style='color:#308080; '>.</span>x <span style='color:#308080; '>+</span> threadIdx<span style='color:#308080; '>.</span>x<span style='color:#406080; '>;</span>
<span style='color:#200080; font-weight:bold; '>if</span> <span style='color:#308080; '>(</span>idx <span style='color:#308080; '><</span> a<span style='color:#308080; '>.</span>size<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
a<span style='color:#308080; '>.</span>array<span style='color:#308080; '>[</span>idx<span style='color:#308080; '>]</span><span style='color:#308080; '>.</span>ResetForce<span style='color:#308080; '>(</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span>
<span style='color:#200080; font-weight:bold; '>for</span> <span style='color:#308080; '>(</span><span style='color:#003060; '>size_t</span> j <span style='color:#308080; '>=</span> <span style='color:#008c00; '>0</span><span style='color:#406080; '>;</span> j <span style='color:#308080; '><</span> a<span style='color:#308080; '>.</span>size<span style='color:#406080; '>;</span> <span style='color:#308080; '>+</span><span style='color:#308080; '>+</span>j<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
<span style='color:#200080; font-weight:bold; '>if</span> <span style='color:#308080; '>(</span>idx <span style='color:#308080; '>!</span><span style='color:#308080; '>=</span> j<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
a<span style='color:#308080; '>.</span>array<span style='color:#308080; '>[</span>idx<span style='color:#308080; '>]</span><span style='color:#308080; '>.</span>AddForce<span style='color:#308080; '>(</span>a<span style='color:#308080; '>.</span>array<span style='color:#308080; '>[</span>j<span style='color:#308080; '>]</span><span style='color:#308080; '>)</span><span style='color:#406080; '>;</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
<span style='color:#200080; font-weight:bold; '>void</span> __global__ SimTick<span style='color:#308080; '>(</span>BodyArray a<span style='color:#308080; '>,</span> <span style='color:#200080; font-weight:bold; '>float</span> dt<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
<span style='color:#200080; font-weight:bold; '>int</span> idx <span style='color:#308080; '>=</span> blockIdx<span style='color:#308080; '>.</span>x <span style='color:#308080; '>*</span> blockDim<span style='color:#308080; '>.</span>x <span style='color:#308080; '>+</span> threadIdx<span style='color:#308080; '>.</span>x<span style='color:#406080; '>;</span>
<span style='color:#200080; font-weight:bold; '>if</span> <span style='color:#308080; '>(</span>idx <span style='color:#308080; '><</span> a<span style='color:#308080; '>.</span>size<span style='color:#308080; '>)</span> <span style='color:#406080; '>{</span>
a<span style='color:#308080; '>.</span>array<span style='color:#308080; '>[</span>idx<span style='color:#308080; '>]</span><span style='color:#308080; '>.</span>Tick<span style='color:#308080; '>(</span>dt<span style='color:#308080; '>)</span><span style='color:#406080; '>;</span>
<span style='color:#406080; '>}</span>
<span style='color:#406080; '>}</span>
</div>
=== Assignment 3 ===
