Recent questions tagged Optimization

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optimization - Fibonacci numbers with OpenMP tasks

Is there any benefit by using OpenMP to parallelize the Fibonacci number calculations? There are several examples online ... dtime, result); } 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 would one ever want to compile with -O2 instead of -O3

We usually compile with -O2 because -O3 would "trigger subtle bugs". For our GCC version -O3 enables more aggressive ... a major issue for us. 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 - optimizing manually-coded k-means in MATLAB?

So I'm writing a k-means script in MATLAB, since the native function doesn't seem to be very efficient, and it ... NaNs (130 rows in mu_k). 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 compiler produce unoptimal assembler

I have compiled flowing simple test kernel (CUDA5, sm2.0): __device__ void TestKernel(int *pdata) { int a0,b0 ... 15 What is possible reason? 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 - Regression with equality and inequality constrained coefficients in R

I am trying to obtain estimated constrained coefficients using RSS. The beta coefficients are constrained between ... -06-01_Optimization.html 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 - Toggle a boolean value with mongoDB

I'm working with a mongoDB database and I want to toggle the boolean present attribute inside the Day object. Here ... my code. Thank you all 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 - Super slow C# custom control

I've made a custom control, it's a FlowLayoutPanel, into which I put a bunch of other custom controls ... imageshack.us/img156/1057/capture.png 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 mysql indexes so that INSERT operations happen quickly on a large table with frequent writes and reads?

I have a table watchlist containing today almost 3Mil records. mysql> select count(*) from watchlist; +----- ... required be a better solution? 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 Perl optimized to skip remaining logic operands if the answer is already decided?

For instance, I need to match some text if $do eq 'b'. If I run this code: if (($do eq 'b') && ( ... should make a new question or post it 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 - z3 minimization and timeout

I try to use the z3 solver for a minimization problem. I was trying to get a timeout, and return the ... of unneccessary computations I guess). See Question&Answers more detail:os...

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

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635 views

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optimization - How efficient is PHP's substr?

I'm writing a parser in PHP which must be able to handle large in-memory strings, so this is a somewhat important ... ($str, 1); in a loop? 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 - storing the weights used by scipy griddata for re-use

I am trying to interpolate data from an unstructured mesh M1 to another unstructured mesh M2. For this, scipy ... .griddata (or equivalent)? 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 is counting letters faster using String#count than using String#chars in Ruby?

Using the following benchmark: def create_genome "gattaca" * 100 end def count_frequency_using_chars( ... # execute_an_empty_loop_instead See Question&Answers more detail:os...

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

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585 views

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optimization - Mysql slow query: INNER JOIN + ORDER BY causes filesort

I'm trying to optimize this query: SELECT `posts`.* FROM `posts` INNER JOIN `posts_tags` ON ` ... index_posts_tags_on_created_at. That's all! See Question&Answers more detail:os...

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

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873 views

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optimization - Find minimum distance between points of two lists in Python

I have two lists of coordinates: s1 = [(0,0), (0,1), (1,0), (1,1)] s2 = [(3,2), (1,9)] ... and s2 (instead of points use 2d arrays for example)? See Question&Answers more detail:os...

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

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1.9k views

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optimization - Help speed up website performance, especially in IE8

Where would you start if you were trying to make this webpage load faster? Site: Game-On Glove It is ... Help would be greatly 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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646 views

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optimization - Very slow loading time with Visual Studio and ASP.NET MVC?

hi, I'm developing an ASP.NET MVC website with Visual Studio 2010. The site is built and running from the ... will return the page ALOT faster? See Question&Answers more detail:os...

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

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446 views

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optimization - Optimizing find and replace over large files in Python

I am a complete beginner to Python or any serious programming language for that matter. I finally got a ... write(inFileStr) inFile.close() See Question&Answers more detail:os...

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

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627 views

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optimization - Does Java optimize division by powers of two to bitshifting?

Does the Java compiler or the JIT compiler optimize divisions or multiplications by a constant power of two down to ... question but for Java) See Question&Answers more detail:os...

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

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769 views

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optimization - Order of columns in a multi-column index in MySQL

I'm trying to understand what is better when defining multi-column indexes: Putting the most selective column first ... for speed or space? See Question&Answers more detail:os...

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

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767 views

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optimization - Paraboloid (3D parabola) surface fitting python

I am trying to fit this x data: [0.4,0.165,0.165,0.585,0.585], this y data: [.45, .22, .63, . ... is inf. Any help would be great. 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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614 views

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optimization - Optimizing I/O(Output) in C code + a loop

I have a code which reads around (10^5) int(s) from stdin and then after performing ## i output them on stdout. I ... 1 } } } return 0; } See Question&Answers more detail:os...

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

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651 views

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optimization - SOLR index size reduction

We have a some massive SOLR indices for a large project, and its consuming above 50 GB of space . We have ... would be appreciated... 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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580 views

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optimization - Pyspark socket timeout exception after application running for a while

I am using pyspark to estimate parameters for a logistic regression model. I use spark to calculate the likelihood ... program starts to crash. See Question&Answers more detail:os...

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

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1.0k views

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optimization - Symfony - update multiple records

What is the best way to update multiple records in database using doctrine, symfony2? I receive array of records ids ... How to do it better? See Question&Answers more detail:os...

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

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725 views

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optimization - What is /optimize C# compiler key intended for?

Is there a full list of optimizations done by the /optimize C# compiler key available anywhere? EDIT: Why ... and Enabled in Release. See Question&Answers more detail:os...

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

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601 views

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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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547 views

1 answer

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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