Recent questions tagged Performance

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performance - Python list() vs list comprehension building speed

This is interesting; list() to force an iterator to get the actual list is so much faster than [x for x in ... : ", time.clock() - timer 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 - Java benchmarking tool

I have written a small java application for which I need to obtain performance metrics such as memory ... measurement tool available? 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 - Why is recursion in python so slow?

So I was messing around in idle with recursion, and I noticed that a loop using recursion was much slower ... of this loop speed 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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performance - What are the benefits of using semantic HTML?

Are there some noticeable outcomes in terms of performance or other aspects to follow semantic HTML? 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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performance - Java JRE vs GCJ

I have this results from a speed test I wrote in Java: Java real 0m20.626s user 0m20.257s sys 0m0.244s GCJ ... -jar SpeedTest.jar // For 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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688 views

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performance - Which is the most efficient way to iterate through a list in python?

Say I have a list of items: x = [1, 2, 3, 4, 5] I need to perform some functions for each of these items. In ... for i in range(len(list)): .... 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 - How big are JavaScript function objects?

I was just wondering how the overhead is on a function object. In an OOP design model, you can spawn up ... taken up by these function objects. See Question&Answers more detail:os...

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

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597 views

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performance - Python: count occurrences in a list using dict comprehension/generator

I want to write some tests to analyse the efficiency of different operations in python, namely a comparison of ... I am trying to test. 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 - Suitable choice of data structure and algorithm for fast k-Nearest Neighbor search in 2D

I have a dataset of approximately 100,000 (X, Y) pairs representing points in 2D space. For each ... assume an almost uniform distribution. 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 to count occurrences of each unique element

What is the fastest way to compute the number of occurrences for each unique element in a vector in R? So far, I' ... 1 to max(x) are present. See Question&Answers more detail:os...

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

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642 views

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performance - How to select a maximum value row in mysql table

I have the following table Table structure: CREATE TABLE IF NOT EXISTS `people` ( `name` varchar(10) NOT NULL ... function or ORDER BY clause? See Question&Answers more detail:os...

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

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595 views

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performance - Benchmarking inside Java code

I have been looking into benchmarking lately, I have always been interested in logging program data etc. I was ... inside your java program? 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 - Why is using a sequence so much slower than using a list in this example

Background: I have a sequence of contiguous, time-stamped data. The data-sequence has holes in it, some large, ... ((fst pair).ToString())) See Question&Answers more detail:os...

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

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881 views

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performance - Is it possible to speed up a sum() in MySQL?

I'm doing a "select sum(foo) from bar" query on a MySQL database that's summing up 7.3mm records and ... trick to speeding up sums in MySQL? 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 - Does an unused import declaration eat memory, in Java?

Does an unused import like so - import android.widget.RelativeLayout; eat memory? Just want to know about how much ... I haven't found answer. See Question&Answers more detail:os...

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

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615 views

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performance - Split Python sequence (time series/array) into subsequences with overlap

I need to extract all subsequences of a time series/array of a given window. For example: >>> ts = pd ... why this version is slightly simpler). See Question&Answers more detail:os...

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

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792 views

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performance - Scroll Lag with CSS3 box-shadow property?

I added a box-shadow to a section of a page recently to give it the same shadow border effect that is seen ... at: CSS3 Info fredericiana's blog See Question&Answers more detail:os...

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

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608 views

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performance - Is there any super fast algorithm for finding LINES on picture?

So I have Image like this (source: de-viz.ru) I want to get something like this (I hevent drawn all ... such algorithm? (super duper fast=) See Question&Answers more detail:os...

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

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566 views

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performance - Fastest way to write an array of integers to a file in Java?

As the title says, I'm looking for the fastest possible way to write integer arrays to files. The arrays ... for Java IO write performance? See Question&Answers more detail:os...

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

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668 views

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performance - Compiling Android project from command line is slow

I'm compiling my (fairly simple, just 5 files with few hundred LOC) app from command line on OSX using: ant ... do to speed up this proccess? See Question&Answers more detail:os...

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

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610 views

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performance - I need a slow C# function

For some testing I'm doing I need a C# function that takes around 10 seconds to execute. It will be ... very slow calculations. Any ideas? See Question&Answers more detail:os...

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

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579 views

1 answer

performance - Java not garbage collecting memory

I am reading a very large file and extracting some small portions of text from each line. However at the end of the ... kb ",alloc,free); } } See Question&Answers more detail:os...

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

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629 views

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performance - How to avoid heap fragmentation?

I'm currently working on a project for medical image processing, that needs a huge amount of memory. Is there ... used for the image data. 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

1 answer

performance - What happens when Java Compiler sees many String concatenations in one line?

Suppose I have an expression in Java such as: String s = "abc" + methodReturningAString() + "ghi" + ... is a smart performance trick done? See Question&Answers more detail:os...

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

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629 views

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performance - Why isn't pass struct by reference a common optimization?

Up until today, I had always thought that decent compilers automatically convert struct pass-by-value to pass-by- ... cases I'm asking about. See Question&Answers more detail:os...

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

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788 views

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performance - Why is math.factorial much slower in Python 2.x than 3.x?

I get the following results on my machine: Python 3.2.2 (default, Sep 4 2011, 09:51:08) [MSC v.1500 32 bit ... 10000L) isn't any faster in 2.7. See Question&Answers more detail:os...

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

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691 views

1 answer

performance - MongoDB limit memory

I am using mongo for storing log files. Both mongoDB and mysql are running on the same machine, virtualizing ... as suggested on other forums? See Question&Answers more detail:os...

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

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705 views

1 answer

performance - How does .NET make use of IO Threads or IO Completion Ports?

We have a .NET application that makes several concurrent calls to various web services, collects their responses ... for a concise explanation. See Question&Answers more detail:os...

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

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