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Questions tagged [processing-efficiency]

622 questions
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Does the product of two constants get computed every time it is executed?

For example, if I have: if(x < 2*0.025) { ... } Does the 2*0.025 get computed every time? Or does a 0.05 get substituted in so that the multiplication operation doesn't have to run every time? In other words, is it more efficient to use 0.05 instead…
Ryan
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What is the most efficient file modification method? Adding many lines to the same file, or reading in, processing, and writing out the file?

I have a perl script that must create a file, write a few hundred lines of content to it, then read all the lines it's written and add lines whenever it finds a match based on a separate configuration file. It's not as ideal as just writing all the…
Andrew Makin
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Curious case of efficiency of equation algorithm, why are more operations faster?

I lately wrote a bit that shall smooth out the extends of a 0-1 range. Out of curiousity I measured the performance of two possibilities to acchieve the same end result. What came out is that this: _ = (Mathf.Sin(-1.57079633f + (time * 3.14159265f))…
CBX_MG
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Why are sequential regular expressions more efficient than a combined experession?

In answering a Splunk question on SO, the following sample text was given: msg: abc.asia - [2021-08-23T00:27:08.152+0000] "GET…
warren
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Is it better to increase process niceness or limit number of cores used on a shared system?

I've often worked in settings where several users have access to the same machine for computationally intensive tasks. The machines in question are standard linux machines (no docker/kubernetes or similar). In some cases, there has been a policy to…
bjarkemoensted
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c# fixed arrays - which structure is fastest to read from?

I have some large arrays of 2D data elements. A and B aren't equally sized dimensions. A) is between 5 and 20 B) is between 1000 and 100000 The initialization time is no problem as its only going to be lookup tables for realtime application, so…
BerggreenDK
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Merging overlapping images into a single image by correctly positioning the patches one on the other

Given many patches that are taken from an image, the task is creating a single image that is composed of the patches. I have tried the naive solution: for every 2 images, go over many patches and compare. If they are similar above some confidence…
GalSuchetzky
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find intersection of 2 doubly linked lists

I have an assignment where I need to find the intersections of 2 singly-linked (singly vs singly) lists. I also have to do it for 2 doubly linked (doubly vs doubly) lists: For singly linked list, I use mergeSort() to sort both lists and then…
lalaland
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Find which element of list is a key in a dictionary and what is it's value

I have a dictionary: classes_dictionary = {'/m/09x0r': 'Speech', '/m/03qc9zr': 'Screaming'} and a list: labels_list = ['/m/03k3r', '/m/04rlf', '/m/07q5rw0', '/m/09x0r', '/m/0jbk'] labels_list will always contain at least one element which is a key…
havakok
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Most efficient way to calculate frequency of pairs of numbers in a 2D Numpy array

Let's say I have the following 2D array: import numpy as np np.random.seed(123) a = np.random.randint(1, 6, size=(5, 3)) which produces: In [371]: a Out[371]: array([[3, 5, 3], [2, 4, 3], [4, 2, 2], [1, 2, 2], [1, 1,…
MaxU - stand with Ukraine
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How to read input line by line in Racket efficiently?

I currently use the following method of reading a file line by line: (for [(line (in-lines))] However, right now my code is too slow. Is there a "faster" way to read the input line by line?
Wallace
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Efficient keys for dictionaries

I'm new to posting here, so I hope I provide enough detail. I'm trying to find out if key selection effects the efficiency of dictionaries in Python. Some comparisons I'm thinking of are: numbers vs strings (e.g. would my_dict[20] be faster than…
ThatNewGuy
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What is the most efficient way to determine if a point is in any number of boxes

I know how to check if a X,Y point is a single rectangular region, but say I have multiple regions that can potentially overlap ( the regions would have X,Y,Width,Height,Z-index ( or x1,y1,x2,y2 if that's easier -- I am not fussed on how I store…
Dre
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Most efficient way to search enumerable

I am writing a small program that takes in a .csv file as input with about 45k rows. I am trying to compare the contents of this file with the contents of a table on a database (SQL Server through dynamics CRM using Xrm.Sdk if it makes a…
Ben
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JS Object of Arrays vs JS Array of Objects efficient and performance

This question regarding javascript language. Simply think we have a map and we insert item as following manner var dataMap=new Map(); //First Mechanism //firstly we can think of structure of values of map can be JSONArray of objects …
user6952310
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