Recent questions tagged performance

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performance - Fast sqrt in Java at the expense of accuracy

I am looking for a fast square root implementation in Java for double values in the input range of [0, 2*10^12 ... .sqrt(). Any ideas? 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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661 views

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performance - Swift Dictionary slow even with optimizations: doing uncessary retain/release?

The following code, which maps simple value holders to booleans, runs over 20x faster in Java than Swift 2 - XCode 7 beta3 ... = " + rate ); } See Question&Answers more detail:os...

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

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762 views

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performance - fast python numpy where functionality?

I am using numpy's where function many times inside several for loops, but it becomes way too slow. Are there any ... )]) for i in UNIQ_IDS)] See Question&Answers more detail:os...

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

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814 views

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performance - Is it better to poll or wait?

I have seen a question on why "polling is bad". In terms of minimizing the amount of processor time used ... is not necessarily 100% accurate. See Question&Answers more detail:os...

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

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900 views

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performance - WPF Data virtualizing ListView

In our current WinForms app, we are displaying millions of records in ListView, using virtualization. Rows are ... it's data virtualization. See Question&Answers more detail:os...

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

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711 views

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performance - Which is better/more efficient: check for bad values or catch Exceptions in Java

Which is more efficient in Java: to check for bad values to prevent exceptions or let the exceptions happen and ... it and catch the exception? See Question&Answers more detail:os...

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

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682 views

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performance - How does python optimize conditional list comprehensions

I read about List comprehension without [ ] in Python so now I know that ''.join([str(x) for x in ... so conditional listcomp still is 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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778 views

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performance - Speed of CSS

This is just a question to help me understand CSS rendering better. Lets say we have a million lines of this. ... pretty large CSS file though. See Question&Answers more detail:os...

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

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695 views

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performance - How to benchmark Matlab processes?

Searching for an idea how to avoid using loop in my Matlab code, I found following comments under one question ... the times between each other? See Question&Answers more detail:os...

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

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920 views

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performance - Processing Large Files in Python [ 1000 GB or More]

Lets say i have a text file of 1000 GB. I need to find how much times a phrase occurs in the text. Is there ... drive and a file of 10000 GB. See Question&Answers more detail:os...

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

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813 views

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performance - php garbage collection while script running

I have a PHP script that runs on cron that can take up to an 15 minutes to execute. At regular intervals I ... a lot of times. Any suggestions? See Question&Answers more detail:os...

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

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794 views

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performance - Is the Perl Goatse 'Secret Operator' efficient?

The "goatse operator" or the =()= idiom in Perl causes an expression to be evaluated in list context. An ... deleting it just to count them. See Question&Answers more detail:os...

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

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917 views

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performance - WCF readerQuotas settings - drawbacks?

If a WCF service returns a byte array in its response message, there's a chance the data will exceed the default ... the data is read? 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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852 views

1 answer

performance - Deleting objects from an ArrayList in Java

I need to delete some objects from an ArrayList if they meet a condition and I'm wondering which way could ... delete objects from an ArrayList? See Question&Answers more detail:os...

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

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839 views

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performance - angular 2 animation vs css animation - when to use what?

I'm currently trying out angular2's animation and I was wondering what specific advantage they bring over ... What about angular2 animations? See Question&Answers more detail:os...

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

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811 views

1 answer

performance - Why is Oracle so slow when I pass a java.sql.Timestamp for a DATE column?

I have a table with a DATE column with time (as usual in Oracle since there isn't a TIME type). When I query that ... and I'm on Oracle 10.2.0. See Question&Answers more detail:os...

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

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682 views

1 answer

performance - Memory allocation for JavaScript types

I'm trying to optimize the hell out of a mobile app I'm working on, and I'd like to know what takes ... take the least amount of memory 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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861 views

1 answer

performance - Loading only part of a bitmap file in Android

I would like to load a cropped version of a bitmap image into a Bitmap object, without loading the original ... the raw data? Thanks, Sandor See Question&Answers more detail:os...

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

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866 views

1 answer

performance - Cache bandwidth per tick for modern CPUs

What is a speed of cache accessing for modern CPUs? How many bytes can be read or written from memory every ... , a practical limit of loading. See Question&Answers more detail:os...

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

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788 views

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performance - tensorflow code optimization strategy

Please excuse the broadness of this question. Maybe once I know more perhaps I can ask more specifically. I have ... I am not aware of.. See Question&Answers more detail:os...

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

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709 views

1 answer

performance - Python's [<generator expression>] at least 3x faster than list(<generator expression>)?

It appears that using [] around a generator expression (test1) behaves substantially better than putting it inside of list( ... 2.7 (r27:82500) See Question&Answers more detail:os...

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

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887 views

1 answer

performance - Shader position vec4 or vec3

I have read some tutorials about GLSL. In certain position attribute is a vec4 in some vec3. I know that the matrix ... MVP*vec4(position,1.0); See Question&Answers more detail:os...

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

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932 views

1 answer

performance - 'for' loop vs Qt's 'foreach' in C++

Which is better (or faster), a C++ for loop or the foreach operator provided by Qt? For example, the following ... listofstrings.at(i); //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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955 views

1 answer

performance - Java foreach efficiency

I have something like this: Map<String, String> myMap = ...; for(String key : myMap.keySet()) { System.out.println( ... key : keySet) { ... } See Question&Answers more detail:os...

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

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1.2k views

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performance - Why C++ lambda is slower than ordinary function when called multiple times?

I just have tried to compare performance of lambda expressions in C++11, so I did the test -- compute ... someone explain that behaviour to me? See Question&Answers more detail:os...

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

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737 views

1 answer

performance - How to optimize Read and Write to subsections of a matrix in R (possibly using data.table)

TL;DR What is the fastest method in R for reading and writing a subset of columns from a very large ... references and addresses of memory. See Question&Answers more detail:os...

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

0 votes

873 views

1 answer

performance - Reading Huge File in Python

I have a 384MB text file with 50 million lines. Each line contains 2 space-separated integers: a key and a ... store the result of the search See Question&Answers more detail:os...

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

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919 views

1 answer

performance - How to use Three.js InstancedBufferGeometry & InstancedBufferAttribute?

I believe "instancing" as described here provides a way to have one attribute for all the vertices/indicies of a, ... to use them in Three.js? See Question&Answers more detail:os...

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

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