Recent questions tagged Optimization

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optimization - Is there a way to tell GCC not to optimise a particular piece of code?

I am working on a project that relies on compiler optimisations but I need some code not to be optimised by GCC. Is this possible? 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 - Java Preprocessor

If I have a boolean field like: private static final boolean DEBUG = false; and within my code I have ... statement and the unreachable code? 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 - Java: Calculate SHA-256 hash of large file efficiently

I need to calculate a SHA-256 hash of a large file (or portion of it). My implementation works fine, but its ... e) { e.printStackTrace(); } 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 - CUDA Block and Grid size efficiencies

What is the advised way of dealing with dynamically-sized datasets in cuda? Is it a case of 'set the block and ... 't really touch on this area. 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 - MySQL EXPLAIN: "Using index" vs. "Using index condition"

The MySQL 5.4 documentation, on Optimizing Queries with EXPLAIN, says this about these Extra remarks: Using index The ... , index was enough")? 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 - What can I do in Java code to optimize for CPU caching?

When writing a Java program, do I have influence on how the CPU will utilize its cache to store my data? For ... don't call malloc() anymore. 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 - Why does a small change to this Scala code make such a huge difference to performance?

I'm running on a 32-bit Debian 6.0 (Squeeze) system (a 2.5 GHz Core 2 CPU), sun-java6 6. ... calculation outside function scope so much slower? 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 - Speeding up Julia's poorly written R examples

The Julia examples to compare performance against R seem particularly convoluted. https://github.com/JuliaLang/julia/blob ... ) } sortperf(5000) 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 - Fast algorithm for repeated calculation of percentile?

In an algorithm I have to calculate the 75th percentile of a data set whenever I add a value. Right now I am ... std::vector<T> _upper; }; 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 - Useful Android system resources

Android comes with lots of system resources (android.R) that can be used to save you time and make your ... from the Android source code. 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 - What are some best practices for reducing memory usage in C?

What are some best practice for "Memory Efficient C programming". Mostly for embedded/mobile device what should be ... memory b) data memory 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 to optimize webpack's build time using prefetchPlugin & analyse tool?

Previous research: As webpack's wiki says, it is possible to use the analyse tool to optimize build performance: ... Analyse tools. Thank you. 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 - Good introductory text about GHC implementation?

When programming in Haskell (and especially when solving Project Euler problems, where suboptimal solutions tend to stress ... I have no clue) 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 - What's the "average" requests per second for a production web application?

I have no frame of reference in terms of what's considered "fast"; I'd always wondered this but have never found a straight answer... 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 - Define a `static const` SIMD Variable within a `C` Function

I have a function in this form (From Fastest Implementation of Exponential Function Using SSE): __m128 FastExpSse( ... t inlined? Thank You. See Question&Answers more detail:os...

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

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367 views

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optimization - Pass by value or reference, to a C++ constructor that needs to store a copy?

Should a C++ (implicit or explicit) value constructor accept its parameter(s) by value or reference-to-const, ... -const instead of by value? 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 - Why does MySQL not use an index for a greater than comparison?

I am trying to optimize a bigger query and ran into this wall when I realized this part of the query was doing a full ... ? Or am I out of luck? 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 - Python garbage collection

I have created some python code which creates an object in a loop, and in every iteration overwrites this ... remove the objects from memory? 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 - In R, how do I find the optimal variable to maximize or minimize correlation between several datasets

I am able to do this easily in Excel, but my dataset has gotten too large. In excel, I would use solver. Column ... in R? Thanks for the help. 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 - Detecting FPU presence on Android

I want to get the most performance of my mobile application on Android. I would like to know if someone ... performance the device can offer. See Question&Answers more detail:os...

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

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358 views

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optimization - Does "if ([bool] == true)" require one more step than "if ([bool])"?

This is a purely pedantic question, to sate my own curiosity. I tend to go with the latter option in the question ( ... , etc.), they 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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470 views

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optimization - C++: optimizing function with no side effects

Is there a way in C++ to declare that a function has no side effects? Consider: LOG("message").SetCategory( ... the whole call can be skipped? 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 - Can I check if the C# compiler inlined a method call?

I'm writing an XNA game where I do per-pixel collision checks. The loop which checks this does so by shifting an ... it, so can I detect 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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415 views

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optimization - Prevent unnecessary copies of C++ functor objects

I have a class which accumulates information about a set of objects, and can act as either a functor or an ... and return that same reference? 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 write a generic memoize function?

I'm writing a function to find triangle numbers and the natural way to write it is recursively: function triangle (x ... function I pass to 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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496 views

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optimization - Can C++ compilers optimize "if" statements inside "for" loops?

Consider an example like this: if (flag) for (condition) do_something(); else for (condition) do_something_else ... conditions is this possible? See Question&Answers more detail:os...

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

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401 views

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optimization - Hyperparameter tune for Tensorflow

I am searching for a hyperparameter tune package for code written directly in Tensorflow (not Keras or Tflearn). Could you make some suggestion? 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 - scipy.optimize.fmin_l_bfgs_b returns 'ABNORMAL_TERMINATION_IN_LNSRCH'

I am using scipy.optimize.fmin_l_bfgs_b to solve a gaussian mixture problem. The means of mixture distributions are ... to the previous one. See Question&Answers more detail:os...

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

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