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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...
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Oct 24, 2021
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performance
0
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600
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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...
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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...
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performance
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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...
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Oct 24, 2021
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performance
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votes
859
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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...
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performance
0
votes
641
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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...
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performance
0
votes
640
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...
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71.8m
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performance
0
votes
694
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answer
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...
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performance
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votes
630
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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...
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performance
0
votes
840
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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...
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performance
0
votes
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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...
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Oct 24, 2021
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71.8m
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performance
0
votes
713
views
1
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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...
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Oct 24, 2021
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71.8m
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performance
0
votes
836
views
1
answer
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...
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Oct 24, 2021
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Technique[技术]
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71.8m
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performance
0
votes
761
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...
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Oct 24, 2021
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Technique[技术]
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71.8m
points)
performance
0
votes
793
views
1
answer
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
750
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
618
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...
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Oct 24, 2021
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71.8m
points)
performance
0
votes
791
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
801
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
718
views
1
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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...
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Oct 24, 2021
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71.8m
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performance
0
votes
653
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...
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Oct 24, 2021
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71.8m
points)
performance
0
votes
801
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...
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Oct 24, 2021
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Technique[技术]
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71.8m
points)
performance
0
votes
857
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...
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Oct 24, 2021
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Technique[技术]
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71.8m
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performance
0
votes
883
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...
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71.8m
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performance
0
votes
1.1k
views
1
answer
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
671
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
791
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...
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Oct 24, 2021
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performance
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863
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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...
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Oct 24, 2021
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