Recent questions tagged performance

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performance - Move all odd positioned element to left half and even positioned to right half in-place

Given an array with positive and negative integers, move all the odd indexed elements to the left and even indexed elements ... it in O( N )? See Question&Answers more detail:os...

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

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performance - ArrayList vs. Vectors in Java if thread safety isn't a concern

Is there really that much of a difference between the performance of Vector and ArrayList? Is it good practice to ... safety isn't an 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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789 views

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performance - Getting an accurate execution time in C++ (micro seconds)

I want to get an accurate execution time in micro seconds of my program implemented with C++. I have tried ... ? for some more general caveats) See Question&Answers more detail:os...

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

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performance - Setting image property of UIImageView causes major lag

Let me tell you about the problem I am having and how I tried to solve it. I have a UIScrollView which loads ... load)? Please help me. =( See Question&Answers more detail:os...

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

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performance - NHibernate - CreateCriteria vs CreateAlias

Assuming the following scenario: class Project{ public Job Job; } class Job{ public Name; } Assuming I want ... wise, is there any difference? 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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performance - Why is appending to a list bad?

I've recently started learning scala, and I've come across the :: (cons) function, which prepends to a list. In the ... add 4 to the end of 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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performance - sql query joins multiple tables - too slow (8 tables)

i'm trying to join 8 tables into one in order to create index used by other application, my query is ... application rules) thanks in advance See Question&Answers more detail:os...

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

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808 views

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performance - Cycles/cost for L1 Cache hit vs. Register on x86?

I remember assuming that an L1 cache hit is 1 cycle (i.e. identical to register access time) in my ... does it compare to register access? See Question&Answers more detail:os...

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

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performance - Python: get a dict from a list based on something inside the dict

I need to be able to find an item in a list (an item in this case being a dict) based on some value ... 'm not seeing thanks to brain melt. See Question&Answers more detail:os...

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

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performance - Fastest way of reading relatively huge byte-files in Java

what's the probably fastest way of reading relatively huge files with Java's I/O-methods? My current solution uses ... .length+" byte each."); See Question&Answers more detail:os...

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

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581 views

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performance - Memory Allocation/Deallocation Bottleneck?

How much of a bottleneck is memory allocation/deallocation in typical real-world programs? Answers from any type of ... be C/C++ specific. See Question&Answers more detail:os...

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

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550 views

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performance - Why is putImageData so slow?

I am working with a relatively large Canvas where various (complex) stuff is drawn to. I then want to ... using Firebug from within Firefox) See Question&Answers more detail:os...

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

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500 views

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performance - When to use each method of launching a subprocess in Ruby

1. `` The Backtick defined in Kernel 1. a) %x{} Percent X < alternate syntax for The Backtick defined ... not complete answers to this question. See Question&Answers more detail:os...

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

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539 views

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performance - MySQL: Many tables or many databases?

For a project we having a bunch of data that always have the same structure and is not linked together. ... Many tables or many databases? See Question&Answers more detail:os...

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

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543 views

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performance - find pair of numbers in array that add to given sum

Question: Given an unsorted array of positive integers, is it possible to find a pair of integers from that array ... proof given for the same? See Question&Answers more detail:os...

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

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563 views

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performance - Writing function definition in header files in C++

I have a class which has many small functions. By small functions, I mean functions that doesn't do any ... is included. Is that correct? See Question&Answers more detail:os...

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

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398 views

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performance - Tactics for using PHP in a high-load site

Before you answer this I have never developed anything popular enough to attain high server loads. Treat me as (sigh ... I should watch out for? See Question&Answers more detail:os...

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

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625 views

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performance - How can I convert seconds since the epoch to hours/minutes/seconds in Java?

Is there a fast, low-garbage way to do it? I can't just do simple modulus arithmetic since that doesn't ... and other date/time funny business. 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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performance - Assembly - How to score a CPU instruction by latency and throughput

I'm looking for a type of a formula / way to measure how fast an instruction is, or more specific to give a " ... any idea how can I do 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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565 views

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performance - How to find Cumulative Layout Shift problems if Page Speed Insights says one thing and Search Console says another

With Cumulative Layout Shift (CLS) now a criteria of Page Speed Insights (PSI) and Google Search Console ( ... Shift using developer tools? See Question&Answers more detail:os...

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

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637 views

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performance - C++ cout printing slowly

I noticed if I print out a long string(char*) using cout it seems to print 1 character at a time to the ... cout is printing so slowly for me? See Question&Answers more detail:os...

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

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759 views

1 answer

performance - How should I calculate Ramp-up time in Jmeter

There are many questions/answers available here to understand Ramp up time but I want to get something in detail ... expectation is 1200 users. See Question&Answers more detail:os...

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

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603 views

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performance - Fast Levenshtein distance in R?

Is there a package that contains Levenshtein distance counting function which is implemented as a C or Fortran code? I ... is too slow for this. See Question&Answers more detail:os...

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

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522 views

1 answer

performance - Which of these pieces of code is faster in Java?

a) for(int i = 100000; i > 0; i--) {} b) for(int i = 1; i < 100001; i++) {} The answer is ... just can't figure out why? From website: 3. a See Question&Answers more detail:os...

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

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685 views

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performance - Is ternary operator, if-else or logical OR faster in javascript?

Which method is faster or more responsive in javascript, if-else, the ternary operator or logical OR? Which is ... to use, for what reasons? See Question&Answers more detail:os...

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

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599 views

1 answer

performance - Why is looping through an Array so much faster than JavaScript's native `indexOf`?

Why is looping through an Array so much faster than JavaScript's native indexOf? Is there an error or something that ... http://jsben.ch/#/xm2BV See Question&Answers more detail:os...

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

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616 views

1 answer

performance - Do c++ templates make programs slow?

I have heard from many people that usage of templates make the code slow. Is it really true. I'm ... queries would be highly regarded. See Question&Answers more detail:os...

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

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1.4k views

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performance - PostgreSQL query very slow with limit 1

My queries get very slow when I add a limit 1. I have a table object_values with timestamped values for objects: ... there a solution for this? See Question&Answers more detail:os...

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

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