Recent questions tagged Performance

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performance - Would a multithreaded Java application exploit a multi-core machine very well?

If I write a multi-threaded java application, will the JVM take care of utilizing all available cores? Do I have to do some work? 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 - Measure time of a function with arguments in Python

I am trying to measure the time of raw_queries(...), unsuccessfully so far. I found that I should use the ... __name__ == '__main__': main() 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 my C code run slow?

I wrote some code in C and I was surprised to see it take a longer time to execute than I expected. ... Thanks once again for the suggestions. 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 GalleryView Recycling

I'm using GalleryView with ~40 images, and so slow because no recycling... Anyone can show me a basic ... ); return i; } } 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 - Neo4j Cypher path finding slow in undirected graph

In a graph with 165k nodes and 266k relationships I'd like to run the following Cypher query: START n=node: ... for the path-returning 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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performance - Battery effects of web apps?

I am learning about mobile web apps, and they look interesting. Among other things, I am wondering whether there ... Phonegap, intel xdk, etc)? 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 - Slow range forEach in Kotlin

I used the following code to measure performance of different syntax constructions in Kotlin fun time(what: String, ... of "range forEach") 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 - Change UIScrollView scroll speed

In my app I have a view that extends UIScrollView and populates its content as the user scrolls. However, if the ... user lifts up the finger. 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 a way to get rows_examined in MySQL without the slow log?

I'm building some profile information for a home grown app. I'd like the debug page to show the query sent ... rows examined? Any other 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 - Rendering a large number of colored particles using three.js and the canvas renderer

I am trying to use the Three.js library to display a large number of colored points on the screen (about half ... the color for all the points. 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 - Indexing on a field which is in array of subdocuments

I'm trying to figure out the best design for the messaging system I'm porting from SQL Server to MongoDB - ... of a document in an array? 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 do CSS sprites speed up a web site?

I'm trying to understand how CSS sprites improve performance on a site? Why is the downloading of several small ... sum of the smaller images? 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 - C++ does printing to terminal significantly slow down code?

I have a code where I currently print a lot of diagnostic messages to terminal. Does anybody have any idea how ... speed not really an issue. 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 - MySQL ORDER BY DESC is fast but ASC is very slow

For some reason when I sort this query by DESC it's super fast, but if sorted by ASC it's extremely slow. This ... ; Is there a fix for 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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performance - Ormlite DAO in android getting really slow when querying more than few thousand results

Have a problem with querying data via Ormlite DAO, when there are few thousand results. Code: List<Point> pl = ... 'm doing wrong? Thanks, Toni 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 improve the speed of XML parsing in VBA

I have a large XML file that needs parsed in VBA (excel 2003 & 2007). There could be upwards of 11,000 ' ... Counter + 1 Next RowNode End Sub 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 - Fast Converting RGBA to ARGB

I am trying to convert a rgba buffer into argb, is there any way to improve the next algorithm, or any other faster way ... >> 16) & 0xff); } } 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 to check the network speed using swift

I have googled too many pages saying on the network reachability (only yes or no availibilty), but I never heard ... me a clue on this issue See Question&Answers more detail:os...

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

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836 views

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performance - SQL server concurrent accessing

When sql server is receiving two queries (SELECT * From the_Same_Table), at exactly the same time, and if u have ... tools to do that. 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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986 views

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performance - JQuery class selector vs id selector

I have 7 different buttons that all perform the same javascript function on click. should i use class selector or ... ? Which is more preferred. 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 the time complexity of LinkedList.getLast() in Java?

I have a private LinkedList in a Java class & will frequently need to retrieve the last element in the list. The lists ... even if it's O(1)?) See Question&Answers more detail:os...

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

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931 views

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performance - OpenGL core profile incredible slowdown on OS X

I added a new GL renderer to my engine, which uses the core profile. While it runs fine on Windows and/ ... , so obviously casues the slowdown. See Question&Answers more detail:os...

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

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991 views

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performance - How to know which count query is the fastest?

I've been exploring query optimizations in the recent releases of Spark SQL 2.3.0-SNAPSHOT and noticed different ... .collect.size q.rdd.count See Question&Answers more detail:os...

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

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878 views

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performance - How much faster is the native implementation of the native cryptographic hashes on Windows than the .Net Managed version?

I'm providing hashes for sets of data in order to fingerprint the data and identify it by hash - this is the ... much faster is the native CSP? 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 modern PC video hardware support VGA text mode in HW, or does the BIOS emulate it (with System Management Mode)?

What really happens on modern PC hardware booted in 16-bit legacy BIOS MBR mode when you store a byte such as ' ... as much overlap as I expect. 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 - How to make this Block of python code short and efficient

I am total newbie to programming and python. I was solving a problem. I found the solution but it seems like ... make it short and efficient. See Question&Answers more detail:os...

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

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940 views

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performance - Android CalendarView slowing down layout

This is driving me crazy. I have a fragment in my Android app which is laid out using a RelativeLayout. ... would be greatly appreciated. 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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1.2k views

1 answer

performance - Fastest stdin/out IO in python 3?

I've been solving a few problems on SPOJ.pl using python 3.1.2 and some peoples fast result on simple ... input and output from stdin/out? See Question&Answers more detail:os...

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

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