Recent questions tagged optimization

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optimization - Pipelining vs Batching in Stackexchange.Redis

I am trying to insert a large(-ish) number of elements in the shortest time possible and I tried these two ... of TCP Sends on both versions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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520 views

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optimization - Python equivalence to inline functions or macros

I just realized that doing x.real*x.real+x.imag*x.imag is three times faster than doing abs(x)**2 ... using macro or using inline keyword? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - GCC: how is march different from mtune?

I tried to scrub the GCC man page for this, but still don't get it, really. What's the difference between ... it ever possible to just -mtune? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Speeding Up Python

This is really two questions, but they are so similar, and to keep it simple, I figured I'd just roll ... rewriting it in something like C? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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669 views

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optimization - Do modern JavaScript JITers need array-length caching in loops?

I find the practice of caching an array's length property inside a for loop quite distasteful. As in, for (var ... , almost as a style choice. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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718 views

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optimization - Skip some arguments in a C++ function?

I have a C++ function that has 5 arguments, all of which have default values. If I pass in the first ... first, second, and fifth arguments? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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701 views

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optimization - R solve:system is exactly singular

I am solving simple optimization problem. The data set has 26 columns and over 3000 rows. The source code looks ... Thank you very much, Alex See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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774 views

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optimization - A better way to replace many strings - obfuscation in C#

I'm trying to obfuscate a large amount of data. I've created a list of words (tokens) which I want to ... each 5 to 15 characters in length. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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387 views

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optimization - C for loop indexing: is forward-indexing faster in new CPUs?

On a mailing list I'm subscribed to, two fairly knowledgeable (IMO) programmers were discussing some optimized code, ... I'm just curious) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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651 views

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optimization - Are constant C expressions evaluated at compile time or at runtime?

If I write a #define that performs an operation using other preprocessor constants, is the final value computed ... would verify each case. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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415 views

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optimization - What is fusion in Haskell?

Every now and again I have been noticing the following in Haskell documentation: (for example in Data.Text): Subject to ... and how do I use it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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723 views

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optimization - Javascript Performance: While vs For Loops

The other day during a tech interview, one of the question asked was "how can you optimize Javascript code"? To my ... And if yes, why is that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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511 views

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optimization - Efficient 4x4 matrix multiplication (C vs assembly)

I'm looking for a faster and trickier way to multiply two 4x4 matrices in C. My current research is focused ... my battle against the machine? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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optimization - How to remove duplicates based on a key in Mongodb?

I have a collection in MongoDB where there are around (~3 million records). My sample record would look like ... in Mongo Internal command line? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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475 views

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optimization - What's the fastest way to read from System.in in Java?

I am reading bunch of integers separated by space or newlines from the standard in using Scanner(System.in). Is ... of doing this in Java? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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541 views

1 answer

optimization - Accelerate bulk insert using Django's ORM?

I'm planning to upload a billion records taken from ~750 files (each ~250MB) to a db using django's ORM. ... any other idea would be welcome :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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594 views

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optimization - How can I speed up my Perl program?

This is really two questions, but they are so similar, and to keep it simple, I figured I'd just roll them ... to psycho and pyrex for Perl). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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536 views

1 answer

optimization - Multiplying a huge number times random() (Python)

Problem: Generate large binary strings (length 2000+). Do it quickly, as this generateRandom() function will be called ... a float? Thank you! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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369 views

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optimization - What branch misprediction does the Branch Target Buffer detect?

I am currently looking at the various parts of the CPU pipeline which can detect branch mispredictions. I have ... raises the BPU CLEAR signal? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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optimization - What's the fastest way to divide an integer by 3?

int x = n / 3; // <-- make this faster // for instance int a = n * 3; // <-- normal integer ... ) + n; // <-- potentially faster multiplication See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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584 views

1 answer

optimization - Fast transcendent / trigonometric functions for Java

Since the trigonometric functions in java.lang.Math are quite slow: is there a library that does a quick and ... than for last bit accuracy. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

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optimization - How to do batching without UBOs?

I'm trying to implement batching for a WebGL renderer which is struggling with lots of small objects due to too ... look at that later. Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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472 views

1 answer

optimization - What does "Optimize Code" option really do in Visual Studio?

Name of the option tells something but what Visual Studio/compiler really do and what are the real consequences? Edit: ... get less time, etc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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587 views

1 answer

optimization - Logger slf4j advantages of formatting with {} instead of string concatenation

Is there any advantage of using {} instead of string concatenation? An example from slf4j logger.debug("Temperature ... views on this issue. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

1 answer

optimization - Django: Set foreign key using integer?

Is there a way to set foreign key relationship using the integer id of a model? This would be for ... get the EmployeeType object first. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

1 answer

optimization - SQL: How to properly check if a record exists

While reading some SQL Tuning-related documentation, I found this: SELECT COUNT(*) : Counts the number of rows. ... the existence of a record? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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465 views

1 answer

optimization - Can I efficiently return an object by value in Rust?

I would like to initialize a large object with a function. Currently I have: fn initialize(mydata: &mut ... or an optional optimization? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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468 views

1 answer

optimization - Fastest Way to Delete a Line from Large File in Python

I am working with a very large (~11GB) text file on a Linux system. I am running it through a program which ... (filename, lineno): Thanks, -aj See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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