Recent questions tagged performance

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performance - Why does the speed of memcpy() drop dramatically every 4KB?

I tested the speed of memcpy() noticing the speed drops dramatically at i*4KB. The result is as follow: the ... sure about Leeor's 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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performance - How is pattern matching in Scala implemented at the bytecode level?

How is pattern matching in Scala implemented at the bytecode level? Is it like a series of if (x instanceof Foo) ... but it has not yet arrived. 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 - Is Laravel really this slow?

I just started using Laravel. I've barely written any code yet, but my pages are taking nearly a second to ... Does it need some fine-tuning? 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 - jQuery UI Autocomplete Combobox Very Slow With Large Select Lists

I'm using a modified version of the jQuery UI Autocomplete Combobox, as seen here: http://jqueryui.com/demos/ ... http://jsfiddle.net/9TaMu/ 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 to analyze golang memory?

I wrote a golang program, that uses 1.2GB of memory at runtime. Calling go tool pprof http://10.10.58 ... /sharewind/push-server/blob/v3/broker 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 - To use the tutorial in android 4.0.3 if had to work with AsynxTasc but i still dont work?

I used this tutorial and did some changes that it should work for android 4.0.3. But it still doesn't. Can someone ... ).show(); } } } } 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 - "GLOBAL could be very inefficient"

I am using (in Matlab) a global statement inside an if command, so that I import the global variable into ... should be slower than the second. 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 - .NET Attributes: Why does GetCustomAttributes() make a new attribute instance every time?

So I was playing around a little more with attributes in .NET, and realized that every call to Type. ... Validated is always "false". 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 - Sluggish zoom and scroll with GridView in Android

I'm creating a custom view derived from GridView. This contains a custom ImageView with zooming and panning ... ImageView. Thanks in advance. 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 - Writing huge strings in python

I have a very long string, almost a megabyte long, that I need to write to a text file. The regular file = ... method 'items' of 'dict' 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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539 views

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performance - How to get the biggest number in a file?

I want to get the maximum number in a file, where numbers are integers that can occur in any place of the ... 166s user 0m6.146s sys 0m0.011s 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 search for a row in a large Google Sheet using/in Google Apps Script

GAS is quite powerful and you could write a full fledged web-app using a Google Sheet as the DB back-end. ... Which method would be the fastest? See Question&Answers more detail:os...

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

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599 views

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performance - More efficient query to avoid OutOfMemoryError in Hive

I'm getting an exception in Hive: java.lang.OutOfMemoryError: GC overhead limit exceeded. In searching I've found ... a.imei=b.imei Thank you See Question&Answers more detail:os...

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

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482 views

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performance - Java graphics - Stages of a game

This is a topic that has been bugging me recently. When creating a game in a JFrame, and you want to add ... other, better ways of doing this? 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

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performance - Python: iterating over list vs over dict items efficiency

Is iterating over some_dict.items() as efficient as iterating over a list of the same items in CPython? See Question&Answers more detail:os...

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

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640 views

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performance - Is BitArray faster in C# for getting a bit value than a simple conjuction with bitwise shift?

1). var bitValue = (byteValue & (1 << bitNumber)) != 0; 2). using System.Collections.BitArray ... simple conjunction with the bitwise shift? See Question&Answers more detail:os...

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

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661 views

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performance - SQL Server - Does column order matter?

In terms of performance and optimizations: When constructing a table in SQL Server, does it matter what order I ... to a difference position? See Question&Answers more detail:os...

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

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512 views

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performance - Why PowerShell workflow is significantly slower than non-workflow script for XML file analysis

I am writing a PowerShell program to analyse the content of 1900+ big XML configuration files (50000+ lines, 1. ... loading XML files in WWF? 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 to parse a text file in C# and be io bound?

It is known that if you read data from disc you are IO bound and you can process/parse the read data much faster than you can read it from ... = i * 10 + (ln[ix++] - '0'); } dobul...

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

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657 views

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performance - CSS shorthand vs longhand?

Which one better? Using shorthand like: padding:5px 10px 15px 20px; Or using longhand like: padding-top:5px ... by developer) and others See Question&Answers more detail:os...

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

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502 views

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performance - What is the fastest way to count elements in an array?

In my models, one of the most repeated tasks to be done is counting the number of each element within an ... fastest way to achieve this goal? See Question&Answers more detail:os...

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

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445 views

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performance - Range() VS Cells() - run times

I see a lot of VBA code on this site using the Range method with For loops: Range("A" & i) As ... and necessary extra explanation in replies? See Question&Answers more detail:os...

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

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451 views

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performance - Denormalized Numbers - IEEE 754 Floating Point

So I'm trying to learn more about Denormalized numbers as defined in the IEEE 754 standard for ... understand about denormalized numbers? 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 - Python if vs try-except

I was wondering why the try-except is slower than the if in the program below. def tryway(): try: while True: ... why the try is so much slower? See Question&Answers more detail:os...

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

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536 views

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performance - c++ passing arguments by reference and pointer

in c++ class bar { int i; char b; float d; }; void foo ( bar arg ); void foo ( bar &arg ); ... about Old CPUs or compilers? thanks in advance See Question&Answers more detail:os...

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

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759 views

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performance - C# FindAll VS Where Speed

Anyone know any speed differences between Where and FindAll on List. I know Where is part of IEnumerable and ... just curious what's faster. See Question&Answers more detail:os...

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

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508 views

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performance - When should we use prefetch?

Some CPU and compilers supply prefetch instructions. Eg: __builtin_prefetch in GCC Document. Although there is a ... some examples? Thx! See Question&Answers more detail:os...

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

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625 views

1 answer

performance - Projecting a list of lists efficiently in F#

I have to do projection of a list of lists which returns all combinations with each element from each list. ... and readability of the function? See Question&Answers more detail:os...

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

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