premature-optimization

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Optimization of importing modules in Python

I am reading David Beazley\'s Python Reference book and he makes a point: For example, if you were performing a[详细]

2023-03-03 12:57 分类：问答
What is a good size for medium sized memory allocations?

For a serializing system, I need to allocate buffers to write data into. The size needed is not known in advance, so the basic pattern is to malloc N bytes and use realloc if more is needed. The size[详细]

2023-02-22 09:58 分类：问答
Do table slices take up memory in R?

If I take a slice of a table using, say the column names, does R allocate memory to hold the slice in a new location? Specifically, I have a table with columns depth1 and depth2, among others. I want[详细]

2023-02-17 12:27 分类：问答
Shear a numpy array

I\'d like to \'shear\' a numpy array. I\'m not sure I\'m using the term \'shear\' correctly; by shear, I mean something like:[详细]

2023-02-10 17:16 分类：问答
Java: Performance of Enums vs. if-then-else

I\'ve had no real luck getting a concise answer for this comparison by using Google and rather than do my own time consuming evaluations, I thought I would ask firs开发者_高级运维t.[详细]

2023-02-08 20:16 分类：问答
Which "if" construct is faster - statement or ternary operator?

There are开发者_如何学编程 two types of if statements in java - classic: if {} else {} and shorthand: exp ? value1 : value2. Is one faster than the other or are they the same?[详细]

2023-02-05 03:46 分类：问答
Why would this Lua optimization hack improve performance?

I\'m looking over a document that describes various techniques to improve performance of Lua script code, and I\'m shocked that such tricks would be required. (Although I\'m quoting Lua, I\'ve seen si[详细]

2023-02-04 09:36 分类：问答
ColdFusion: More efficient structKeyExists() instead of isDefined()

Which of these is more开发者_如何学C efficient in ColdFusion? isDefined(\'url.myvar\') or structKeyExists(url, \'myvar\')[详细]

2023-01-20 04:12 分类：问答
Are Java static calls more or less expensive than non-static calls?

Is there any per开发者_JAVA技巧formance benefit one way or another?Is it compiler/VM specific?I am using Hotspot.First: you shouldn\'t be making the choice of static vs non-static on the basis of perf[详细]

2023-01-17 14:40 分类：问答
How to write more efficient code

Question of the century? I basically want to know which would be more efficient if I wrote this code as several different variables or if I used small arrays.[详细]

2023-01-13 04:05 分类：问答