April 2014
Beginner to intermediate
830 pages
15h 21m
Chinese
Content preview from Mathematica 錦囊妙計
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第十六章
討論說明
ParallelTable
指令有許多好用的應用。例如，大量圖形最適合利用多核心電腦繪製，
而平行運算使得動畫製作更有效率。[Page-657]
ch16.indd 654 2014/4/2 下午 04:11:05
16.8 選擇適當的資料分散處理方法
|
655
多筆資料組也可平行化建立，以便進一步繪圖與運算。[Page-658]
16.8 選擇適當的資料分散處理方法
問題點
你的計算對不同輸入有很大的執行時間差異，但你想使用平行處理。[Page-659]
解決方案
平 行 運 算 的 基 本 指 令
Parallelize
、
ParallelMap
、
ParallelTable
、
ParallelDo
、
ParallelSum
與
ParallelCombine
均支援
Method
選項，可用來指定資料分割平行處理的
粗細度。
當執行時間對不同輸入而有很大差異時，建議設定
Method
→
"FinestGrained"
選項，
此選項可避免計算核心分配到過於龐大而耗時的運算量。為了說明這一點，以下使用
Pause
指令控制函數的計算時間，先以亂數建立許多小數目的計算時間，接著加入一個
大數目模擬耗時的計算。
ch16.indd 655 2014/4/2 下午 04:11:05
656
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第十六章
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.