Recent questions tagged Performance

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performance - Python: Why is list comprehension slower than for loop

Essentially these are the same functions - except list comprehension uses sum instead of x=0; x+= since the later is ... ) for i in range(x)] See Question&Answers more detail:os...

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

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performance - Real-time interrupts in Python

I have a Python 2.7 program running an infinite while loop and I want to incorporate a timer interrupt. What I aim ... can I do that in python? See Question&Answers more detail:os...

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

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performance - binary search efficiency vs. linear search efficiency in fortran

This question is about the efficiency of a linear search vs. the efficiency of a binary search for a pre-sorted ... size around 100 elements... See Question&Answers more detail:os...

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

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performance - What is a Bookmark Lookup in Sql Server?

I'm in the process of trying to optimize a query that looks up historical data. I'm using the query analyzer to ... or a bad thing in a query? See Question&Answers more detail:os...

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

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699 views

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performance - How to multipart data using Android Volley

I am using Volley for calling web request for my app. But as i am Volley for first time. I just want ... appreciated. Thank you for your help. See Question&Answers more detail:os...

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

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799 views

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performance - What is the fastest way to merge two lists in python?

Given, list_1 = [1,2,3,4] list_2 = [5,6,7,8] What is the fastest way to achieve the following in ... I am not sure about other options 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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performance - Is there any runtime cost for Casting in Java?

Would there be any performance differences between these two chunks? public void doSomething(Supertype input) { Subtype ... between these two? See Question&Answers more detail:os...

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

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615 views

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performance - Why misaligned address access incur 2 or more accesses?

The normal answers to why data alignment is to access more efficiently and to simplify the design of CPU. A ... . Thank you in advance! See Question&Answers more detail:os...

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

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610 views

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performance - What is the fastest way to perform arithmetic operations on each element of a cell array?

Say I want to multiply each element of a cell array A with a coefficent k. I can do that by: A = cellfun(@(x) ... i] = rp[i] * coefficient; } } See Question&Answers more detail:os...

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

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714 views

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performance - Decrease loading time from coldstart in cordova ionic

I have created a cordova app using ionic, When i open my app from coldstart, It first loads the splash screen ... other hybrid apps like gmail. See Question&Answers more detail:os...

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

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851 views

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performance - Find all integer coordinates in a given radius

Given a two-dimensional coordinate system how can I find all points with integer coordinates in a radius from ... need floating point accuracy. See Question&Answers more detail:os...

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

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663 views

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performance - Drawing image with CoreGraphics on Retina iPad is slow

In my iPad app, I am rendering to an offscreen bitmap, and then drawing the bitmap to the screen. (This is ... to the GPU directly. Any ideas? See Question&Answers more detail:os...

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

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performance - How can I get CPU usage and/or RAM usage of a *THREAD* in C# (managed code)?

I know how to get CPU usage and memory usage for a process, but I was wondering how to ... .WriteLine(GetThreadSpecificCpuUsage(myThread)); See Question&Answers more detail:os...

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

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816 views

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performance - How to speed up GLM estimation?

I am using RStudio 0.97.320 (R 2.15.3) on Amazon EC2. My data frame has 200k rows and 12 columns. I ... speed this up by a significant amount? See Question&Answers more detail:os...

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

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820 views

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performance - Intel Intrinsics guide - Latency and Throughput

Can somebody explain the Latency and the Throughput values given in the Intel Intrinsic Guide? Have I understood it correctly ... (e.g. mulps)? See Question&Answers more detail:os...

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

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503 views

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performance - Why does loop alignment on 32 byte make code faster?

Look at this code: one.cpp: bool test(int a, int b, int c, int d); int main() { volatile int va = 1; ... 0f 1f 40 00 nop DWORD PTR [rax+0x0] See Question&Answers more detail:os...

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

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804 views

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performance - How to detect internet speed in PHP?

How can I create a PHP page that will detect the user's internet speed and show it on the page? Something like, Your internet speed is ??? Kbps See Question&Answers more detail:os...

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

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635 views

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performance - Why does adding one more alternative make my regex over 600 times slower?

I noticed something weird while testing a simple Perl script that's supposed to filter out filenames beginning with ... at that specific point? See Question&Answers more detail:os...

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

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768 views

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performance - C faster way to check if a directory exists

I'm using opendir function to check if a directory exists. The problem is that I'm using it on a massive loop ... create it if doesn't exists? See Question&Answers more detail:os...

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

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660 views

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performance - What's better for creating distinct data structures: HashSet or Linq's Distinct()?

I'm wondering whether I can get a consensus on which method is the better approach to creating a distinct set ... of the options. 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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898 views

1 answer

performance - Should I use prefixfilter or rowkey range scan in HBase

I don't know why it's very slow if I use prefixfilter to query. Can someone explain which is the best way to ... 1 row(s) in 0.1100 seconds See Question&Answers more detail:os...

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

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586 views

1 answer

performance - Calculating all distances between one point and a group of points efficiently in R

First of all, I am new to R (I started yesterday). I have two groups of points, data and centers, the ... computation in less than one second. See Question&Answers more detail:os...

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

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577 views

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performance - Using C/Intel assembly, what is the fastest way to test if a 128-byte memory block contains all zeros?

Continuing on from my first question, I am trying to optimize a memory hotspot found via VTune profiling a 64 ... this problem are also welcome. See Question&Answers more detail:os...

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

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performance - How can the rep stosb instruction execute faster than the equivalent loop?

How can the instruction rep stosb execute faster than this code? Clear: mov byte [edi],AL ; Write the value ... of writing the loop manually? See Question&Answers more detail:os...

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

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615 views

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performance - How can I make displaying images on WPF more “snappy”?

I'm writing a WPF image viewer, displaying a grid of images. I'm baffled because of the sluggish ... ; this.ImageSource = formatConvertedBitmap; See Question&Answers more detail:os...

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

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611 views

1 answer

performance - How heavy are Java Monitors?

Say I have an array of thousands of objects, and a small number of threads that might access each of the objects ... 'm looking for an insight). See Question&Answers more detail:os...

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

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625 views

1 answer

performance - how to reduce ssl time of website

I have an HTTPS website and I want to reduce the SSL time of this website. The SSL certificate has been ... ://www.google.com/index.html See Question&Answers more detail:os...

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

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691 views

1 answer

performance - Verifying that two files are identical using pure PHP?

TL;DR: I have an CMS system that stores attachments (opaque files) using SHA-1 of the file contents as the ... 'd rather not write that 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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