Performance Tips and Tricks in .NET Applications 文章Title 不知道为什麽 Jagged Arrays 会比 Rectangular arrays 好？ Use Jagged Arrays—Version 1 The v1 JIT optimizes jagged arrays (simply 'arrays-of-arrays') more efficiently than rectangular arrays, and the difference is quite noticeable. Here is a table demonstrating the performance gain resulting from using jagged arrays in place of rectangular ones in both C# and Visual Basic (higher numbers are better): C# Visual Basic 7 Assignment (jagged) Assignment (rectangular) 14.16 8.37 12.24 8.62 Neural Net (jagged) Neural net (rectangular) 4.48 3.00 4.58 3.13 Numeric Sort (jagged) Numeric Sort (rectangular) 4.88 2.05 5.07 2.06 The assignment benchmark is a simple assignment algorithm, adapted from the step-by-step guide found in Quantitative Decision Making for Business (Gordon, Pressman, and Cohn; Prentice-Hall; out of print). The neural net test runs a series of patterns over a small neural network, and the numeric sort is self-explanatory. Taken together, these benchmarks represent a good indication of real-world performance. As you can see, using jagged arrays can result in fairly dramatic performance increases. The optimizations made to jagged arrays will be added to future versions of the JIT, but for v1 you can save yourself a lot of time by using jagged arrays. -- ----------------------------------------------------------------------------- 功课重，Project多的好帮手--专案王 http://steven.twbbs.org/ProjectKing 增加右键的威力RightMenuKing--右键王 http://steven.twbbs.org/RightMenuKing/ 备份重要档案的好帮BackupKing--备份王 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.113.216.156