Recent questions tagged Performance

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performance - Fast plane fitting to many points

I'm looking to fit a plane to a set of ~ 6-10k 3D points. I'm looking to do this as fast as ... I could jump straight past the best plane. 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 - Powershell Count lines extremely large file

I have a extremely large text file of size 250 GB that's given to us by a vendor. They also give us ... count Any help is appreciated Thanks MR 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 - Tarfile in Python: Can I untar more efficiently by extracting only some of the data?

I am ordering a huge pile landsat scenes from the USGS, which come as tar.gz archives. I am writing a simple ... part of an archive. 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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performance - Fastest way to filter a data.frame list column contents in R / Rcpp

I have a data.frame: df <- structure(list(id = 1:3, vars = list("a", c("a", "b", "c"), c("b", ... == character(0) if it must be a seperate step. 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 - speed comparison between fgetc/fputc and fread/fwrite in C

So(just for fun), i was just trying to write a C code to copy a file. I read around and it seems that ... to the variable st in the second 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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performance - JavaScript "classes"

Are there any downsides to using a JavaScript "class" with this pattern? var FooClass = function() { var private = ... = "bar"; foo.publicfn(); 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 - Javascript jQuery best way to insert a big piece of code into DOM

I have a big piece of code that needs to be inserted into DOM at some point. The code also contain some ... from the performance point of view? See Question&Answers more detail:os...

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

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921 views

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performance - Finding closest non-black pixel in an image fast

I have a 2D image randomly and sparsely scattered with pixels. given a point on the image, I need to find ... care about what this something is. 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 x86 bsr/bsf have fixed latency, not data dependent? Doesn't it loop over bits like the pseudocode shows?

I am on the hook to analyze some "timing channels" of some x86 binary code. I am posting one question to ... behind? Easier for CPU pipelines? 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 - Python efficient way to check if very large string contains a substring

Python is not my best language, and so I'm not all that good at finding the most efficient solutions to ... sequences, not just every line. 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 - Xcode suddenly becomes very slow

My Xcode speed has come down to a crawl. I have no idea why. CPU activity is very low on both cores, gobs ... only a little bit. 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 testing - I m getting java.net.SocketException: Connection reset exception while running a load test using Jmeter

I m running a load test on login page of my application for 100 users out of 100 20 users are passing ... java.lang.Thread.run(Unknown Source) 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 - Android EditText alternative

Currently, Android's EditText is extremely slow when dealing with a huge amount of lines of text (10000 ... android.text.StaticLayout.generate) 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 - SQL Server: Select in vs or?

Which is faster? SELECT UserName FROM dbo.UserTable WHERE UserID in (1,3,4) SELECT UserName FROM dbo.UserTable WHERE ... = 3 OR UserID = 4 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 - Why does android:singleLine="true" make ListView scrolling very laggy?

I've noticed that android:singleLine="true", if used in the TextView of Listitem in ListView, makes scrolling ... android still using that ? See Question&Answers more detail:os...

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

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1.0k views

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performance - SQL question: Does the order of the WHERE clause make a difference?

From a performance standpoint, does the order of my SQL WHERE statements make a difference? For instance SELECT . ... of my WHERE statements? 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 - Integer calculations on GPU

For my work it's particularly interesting to do integer calculations, which obviously are not what GPUs were ... precision integers on GPUs? See Question&Answers more detail:os...

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

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1.1k views

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performance - How much slower python classes are compared to their equivalent functions?

When I started learning Python, I created a few applications just using functions and procedural code. However ... difference in speed? 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 - faster membership testing in python than set()

I have to check presence of millions of elements (20-30 letters str) in the list containing 10-100k of those ... #update ids ids.remove( id ) 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 - Slow down CPU to simulate slower computers in browser testing

I'm trying to see how our web pages behave on an average customer's computer. We have not yet pinned down ... you the option of limiting this? See Question&Answers more detail:os...

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

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912 views

1 answer

performance - Java app that uses a lot of memory. Use -Xmx?

I have a java app that uses about 15G on a machine with 16G. I don't know if I should set the max heap ... 1.6.0_03-b05, mixed mode). 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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996 views

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performance - C: Comparison to NULL

Religious arguments aside: Option1: if (pointer[i] == NULL) ... Option2: if (!pointer[i]) ... In C ... quicker due to absence of a comparison ? 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 - Does a varchar field's declared size have any impact in PostgreSQL?

Is VARCHAR(100) any better than VARCHAR(500) from a performance point of view? What about disk usage? Talking ... database some time in history. See Question&Answers more detail:os...

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

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946 views

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performance - Does Linux Time Division Processes Or Threads

A prof once told us in class that Windows, Linux, OS X and UNIX scale on threads and not processes, so ... the results from my home machine? See Question&Answers more detail:os...

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

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971 views

1 answer

performance - Spark: Explicit caching can interfere with Catalyst optimizer's ability to optimize some queries?

I'm studying to take the data bricks to spark certification exam, and their practice exam ( please see > ... making things worse? /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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833 views

1 answer

performance - C# Events: How to process event in a parallel manner

I have an event which I would like to have processed in a parallel manner. My idea is to make each callback ... answer. - Updated try-out 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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1.4k views

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performance - Python subprocess.Popen slow under uWSGI

I've set up a development server running Cherokee on Fedora 14, using uWSGI to interface with my WSGI ... Have I missed something obvious? See Question&Answers more detail:os...

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

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1.0k views

1 answer

performance - do-while is the fastest loop in php?

I have profiled for, while and do-while loops with something simple: while ($var < 1000000) { ++$var; } do { ... and dont be afraid to be wrong. See Question&Answers more detail:os...

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

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