143 lines
7.2 KiB
HTML
143 lines
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<h1 id="關於仿真過程cpu的使用率">關於仿真過程CPU的使用率</h1>
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<h2 id="仿真的運算線程">仿真的運算線程</h2>
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<p>時序資料的計算是單線程（同一時間只使用一個CPU核心），其他資料則可以平行計算。</p>
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<h3 id="幾何移除">幾何移除</h3>
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<p>幾何移除是單線程，因為按照次序切削才能得到正確的CWE（刀具工件接觸面）。幾何移除後的工件幾何表面是淡粉色，通常代表該處的物理量尚未計算完成。</p>
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<h3 id="物理計算">物理計算</h3>
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<p>切削力的計算在取得CWE之後，因其不受計算次序影響，一般模式下為多線程計算。力矩等物理量也會在這個步驟多線程計算。</p>
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<p>溫度的計算必須是時序，所以又會收斂至單線程。</p>
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<p>整個加工仿真的計算過程就這樣分分合合，一個步被計算完成後會在該步著上指定指標的顏色。</p>
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<h2 id="cpu的使用率">CPU的使用率</h2>
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<h3 id="幾何解析度大時">幾何解析度大時</h3>
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<p>幾何解析度大的時候，幾何移除較物理計算快，所以仿真過程會看到一大片的淡粉色跟在刀具後面跑。未計算完成的步數有數量限制，幾何移除在該數量內才會運行。所以在物理計算跟不上幾何移除的速度時，粉色步數會維持固定數量。</p>
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<p>這種情況主要是CPU的多核運算（物理計算），比較容易看到CPU多核使用率偏高。</p>
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<p><img src="geom-quick.png" alt="幾何解析度大時"></p>
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<h3 id="幾何解析度小時">幾何解析度小時</h3>
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<p>幾何解析度小的時候，幾何移除較物理計算慢，所以幾乎看不到淡粉色。</p>
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<p>這種情況主要是CPU的單核運算（幾何計算）。</p>
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<p><img src="geom-slow.png" alt="幾何解析度小時"></p>
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<h3 id="平衡狀態">平衡狀態</h3>
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<p>如果幾何解析度剛好使得幾何計算與物理計算不互相拖累，那淡粉色區域會出現並在某個長度內變化。此時物理計算不會拖累幾何計算，通常幾何計算才是運算速度的瓶頸。</p>
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<h3 id="cpu未跑滿的情況">CPU未跑滿的情況</h3>
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<p>CPU沒有跑滿，原因可能包含:</p>
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<ul>
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<li>作業系統為了確保GUI能即時反應，預留空間不讓跑。如Windows桌面軟體(如WPF)會把非GUI的執行緒優先權降一個等級。</li>
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<li>軟硬件吞吐量對該程序已達極限。
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偵測的CPU使用量未達100%但是其他機能如Cache、匯流速度已滿，系統環境的智慧功能如CPU預測指令失誤(Branch Misprediction)也不會包含在偵測的CPU使用量中。</li>
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</ul>
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<p>這部分目前沒有解法。</p>
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