Recent questions tagged optimization

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optimization - Checking for string contents? string Length Vs Empty String

Which is more efficient for the compiler and the best practice for checking whether a string is blank? Checking ... answer depend on language? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Data verifications in Getter/Setter or elsewhere?

I'm wondering if it's a good idea to make verifications in getters and setters, or elsewhere in the code. This ... or database. Am I wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - How do I find how C++ compiler implements something except inspecting emitted machine code?

Suppose I crafted a set of classes to abstract something and now I worry whether my C++ compiler will be able to peel ... what I coded in C++? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Checking for string contents? string Length Vs Empty String

Which is more efficient for the compiler and the best practice for checking whether a string is blank? Checking ... answer depend on language? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - How can I make a container with copy-on-write semantics? (Swift)

I have a very large structure, which I want to ensure is not copied needlessly. How can I make a copy-on-write container for it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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414 views

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optimization - Improve C function performance with cache locality?

I have to find a diagonal difference in a matrix represented as 2d array and the function prototype is int ... way to improve my function? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Most efficient way to find elements in jQuery

If I have a CSS class which I only ever apply to form elements, eg: <form class="myForm"> Which of these two ... .myForm') b) $('.myForm') See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - How can I force GCC to compile functions that are not used?

I am splitting off some of the code in my project into a separate library to be reused in another ... -64_linux_2.6.5_ImageSLES9SP3-3). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Applying the optim function in R in C++ with Rcpp

I am trying to call R function optim() in Rcpp. I saw an example in Calling R's optim function from within ... not sure what the error is here. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Is it possible to set the python -O (optimize) flag within a script?

I'd like to set the optimize flag (python -O myscript.py) at runtime within a python script based on a command ... for #if and #ifdef in C++? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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598 views

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optimization - How do you identify unused indexes in a MySQL database?

I have recently completely re-written a large project. In doing so, I have consolidated great number of random MySQL ... and which ones are not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Effects of branch prediction on performance?

When I'm writing some tight loop that needs to work fast I am often bothered by thoughts about how the processor ... root of all evil" phase) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Oracle: does the column order matter in an index?

An index on two columns can be created with either of the statements create index foo_ix on foo(a,b); create ... which column I put first? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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419 views

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optimization - Native way to merge objects in Javascript

Javascript's Object doesn't have any native merge operation. If you have two objects, say {a:1, b:2} {c:3, ... doesn't go all the way though. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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491 views

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optimization - Does node.js really not optimize calls to [].slice.call(arguments)?

In the bluebird docs, they have this as an anti-pattern that stops optimization.. They call it argument leaking, ... latest version of Node.js. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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386 views

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optimization - Counting collisions in a Python dictionary

my first time posting here, so hope I've asked my question in the right sort of way, After adding an element to ... " (as @John Machin put it)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Most efficient way to split strings in Python

My current Python Project will require a lot of string splitting to process incoming packages. Since I will be ... for the input, everyone. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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747 views

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optimization - Is there a way to declare an inline function in Swift?

I'm very new to the Swift language. I wanted to declare an inline function just like in C++ so my func ... way to inline the function in Swift. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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392 views

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optimization - Why not always use psyco for Python code?

psyco seems to be quite helpful in optimizing Python code, and it does it in a very non-intrusive way. Therefore, ... see no good reason not to. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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493 views

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optimization - Computing 8 horizontal sums of eight AVX single-precision floating-point vectors

I have 8 AVX vectors containing 8 floats each (64 floats in total) and I want to sum elements in each vector ... (faster) way to compute this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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433 views

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optimization - how does an optimizing c++ compiler reuse stack slots of a function?

How does an optimizing c++ compiler determine when a stack slot of a function(part of stack frame of a ... on this subject is appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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440 views

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optimization - Fast Search to see if a String Exists in Large Files with Delphi

I have a FindFile routine in my program which will list files, but if the "Containing Text" field is filled ... Thanks once again SO community. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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382 views

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optimization - What algorithm can I use to determine points within a semi-circle?

I have a list of two-dimensional points and I want to obtain which of them fall within a semi-circle. ... which are not within the bounds. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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415 views

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optimization - How to stop C# from replacing const variable with their values?

We have a project that's compiled into a DLL called consts.dll that contains something like: public static ... variables with their values? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

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optimization - Template-ing a 'for' loop in C++?

I have a C++ snippet below with a run-time for loop, for(int i = 0; i < I; i++) for (int j ... :lambda (or something else) help me create this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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444 views

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optimization - Oracle 10g - optimize WHERE IS NOT NULL

We have Oracle 10g and we need to query 1 table (no joins) and filter out rows where 1 of the columns ... there any solutions to this? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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optimization - Delphi: How to organize source code to increase compiler performance?

I'm working on a large delphi 6 project with quite a lot of dependancies. It takes several minutes to compile ... delphi on the ramdisk too) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

1 answer

optimization - Moving beyond R's optim function

I am trying to use R to estimate a multinomial logit model with a manual specification. I have found a ... certainly open to other approaches. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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