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Can function overhead slow down a program by a factor of 50x?

I have a code that I\'m running for a project. It is O(开发者_高级运维N^2), where N is 200 for my case. There is an algorithm that turns this O(N^2) to O(N logN). This means that, with this new algori[详细]

2023-04-12 06:44 分类：问答
What is the memory overhead for analyzing a heap with jhat?

jhat is a great tool for analyzing Java heap dumps, but for large heaps its easy to waste a lot of time. Give jhat a runtime heap too small, and it may take 15 minutes to fail and run out of memory.[详细]

2023-04-10 18:50 分类：问答
OpenGL constant color

I read in this Apple documentation (under the header \"Avoid Storing Constants in Attribute Arrays\") it says that if a model\'s vertices all have the same colour then colour shouldn\'t be a vertex at[详细]

2023-04-08 16:10 分类：问答
Top head detection from overhead camera

I have a camera set up开发者_开发问答 on a ceiling , capturing people standing in line. I need to count the amount of people. Currently I do that with background subtraction and Hough transform. The d[详细]

2023-04-01 16:49 分类：问答
repeat $() all over the place or declare once and reuse?

Using jQuery, if I am writing code l开发者_StackOverflow社区ike this $(\'blah\').doSomething(); //bunch of code[详细]

2023-03-26 05:59 分类：问答
at all times text encoded in UTF-8 will never give us more than a +50% file size of the same text encoded in UTF-16. true / false?

Somewhere I read (rephrased): If we compare a UTF-8 encoded file VS a UTF-16 encoded file, At some times, the UTF-8 file may give a 50% to 100% larger file size[详细]

2023-03-24 04:24 分类：问答
Performance comparison between Windows gcc compiled & Visual Studio compiled

I\'m currently compiling an open source optimization library (n开发者_高级运维ative C++) supplied with makefiles for use with gcc. As I am a Windows user, I\'m curious on the two options I see of comp[详细]

2023-03-22 15:15 分类：问答
C++ exception overhead

Why do embedded platform developers continuosly attempt to remove usage C++ exceptions from their SDKs?[详细]

2023-03-20 04:28 分类：问答
Javascript overhead associated with Class versus object

I was wondering if the overhead associated with creating a new class instead of a new object of that class was small or large. I am using dojo, but I will provide versus examples for pure JS. I will b[详细]

2023-03-19 15:07 分类：问答
Will inline speed up void a(string b) { cout << b; }

For an assignment, we\'re supposed to write two methods for handling outputs. One for outputting strings, and one for integers.[详细]

2023-03-16 16:52 分类：问答