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作者 latinboy 在 PTT [ Fortran ] 看板的留言(推文), 共100則
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1F推: 先測試看看沒有IO時候的速度吧03/24 14:25
4F推: 初始最大最小值應該都設定為第一個輸入的數字10/09 09:14
12F→:(1/2)這一項看起來很危險03/17 08:22
1F推: 每個語言都有它的特性 Fortran適合做陣列運算02/26 09:16
2F→: code寫得"好" compiler會自己搞定最佳化02/26 09:17
3F→: 秒殺大概真的是因為沒有輸出 過程被compiler跳過了11/14 08:24
3F推: 同樣的運算在回圈內做了很多次阿11/12 11:02
4F→: wkiG1*xyz(1)如果迴圈執行中沒有變動 應該包在第一層11/12 11:06
20F推: 有一個可能,如果你沒有開csumout,compiler說不定直接11/13 09:47
21F→: 跳過所有計算過程 因為你沒有輸出 所以把他最佳化掉了!11/13 09:47
22F→: 所以產生了速度提高的錯覺.....11/13 09:48
23F→: 沒有看到完整的code很拿抓藥 只能猜測11/13 09:49
24F→: 如果不介意 可以私信討論 以前做最佳化很有心得11/13 09:50
2F推: Compaq太古老了,在win系統上可改用intel fortran08/30 11:34
1F推: 手動拆B迴圈成兩部分 再用SECTION包成普通迴圈03/20 10:49
2F→: 如果A的運算量不大 就不要讓A平行03/20 10:50
2F噓: 作業文03/18 19:47
3F→: 何不直接宣告常數 pi = 3.14159265358979323846264d002/09 01:24