Recent questions tagged performance

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performance - New android SDK 17 issue in my app?

Today i was update my android sdk to new android adk-17 . i am facing some problems in this, that is unable ... /app/com.veritra.iflipout-1.apk] 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 - Java.net.SocketException connection reset error in .net application

We have a n-tier (.net) web application where we have a Web tier -> App tier -> Database. ... Softwares Installed Microsoft SQL Sever 2014 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 tune hive to query metadata?

In case I am running a below hive query on table with certain partitioned column, I want to make sure hive ... the value from metadata itself. 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 - Alternative of slower ifelse in R data table

I am writing a function where multiple ifelse are being used for data table operation. Although I am using data tables for ... |!nzchar(x),1,0)] 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 series of x86 call/ret instructions form a dependent chain?

Consider the following x86-64 assembly: inner: ... ret outer: .top: call inner dec rdi jnz .top ret The ... out into "return address predictor". 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 - Finding the longest non-negative sub array

I'm looking for an more efficient alternative to brute force for finding the longest sub array of an array ... Any help would be appreciated! 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 - The Running Time For Arrays.Sort Method in Java

Does anyone know the running time in big O notation for the arrays.sort java method? I need this for my science fair project. 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 - First time a Java loop is run SLOW, why? [Sun HotSpot 1.5, sparc]

In benchmarking some Java code on a Solaris SPARC box, I noticed that the first time I call the benchmarked function it ... -= 99; } } } 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 is ftp upload slow in java 7

I wanted to ask if anyone knows about any Java 7 issues with FTP? I've used both the Sun Net and Apache ... in advance for any insight given. 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 - Multicore and thread aware .Net stopwatch?

As we all know the stopwatch might have issues in a multi-threaded async application that will be running on all ... can provide. (10-15ms) 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 - Why does the java DirectoryStream perform so slow?

I've done some testing with Streams in special with DirectoryStreams of the nio-package. I simply try to ... an Object is bursting performance. 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 - Excel VBA: Writing an array to cells is very slow

I am working with VBA in Excel to retrieve some information from the Reuters 3000 Database. The data I ... retrieved) Thanks in advanced. 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 - Textarea slow for logging

I have a Qt application and I'd like to show some log. I use a TextArea. However, if ... ; emit rawCommunicationChanged(m_rawCommunication); } 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# LockBits perfomance (int[,] to byte[])

Graphics g; using (var bmp = new Bitmap(_frame, _height, PixelFormat.Format24bppRgb)) { var data = bmp.LockBits( ... million for the same time. 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 solution to list all pairs of n integers?

I want to list all possible pairs of the integers [1, n] with a large n. I find myself looking for the ... that may or may not be faster? 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: analyze a list comprehension with dis

Recently, I had a discussion on SO (see it for the context) about the two following pieces of code: res = ... on the stack for the YIELD_VALUE. 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 of SELECT vs. SET in T-SQL

I've been led to believe that for single variable assignment in T-SQL, set is the best way to go ... really going to notice the difference? 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 exclude warmup time from JMeter summary?

I have a simple JMeter throughput test that spawns 20 threads and each thread executes a simple SQL query against a ... can do that in JMeter? 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 much does function alignment actually matter on modern processors?

When I compile C code with a recent compiler on an amd64 or x86 system, functions are aligned to a multiple ... to span multiple cache lines. 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 identify or detect data skew in Hive table?

We have many hive queries that take lot of time. We are using tez and other good practices like CBO, using ... parameter should I look for? 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 - Highlighting text in document (JavaScript) Efficiently

How can I (efficiently - not slowing the computer [cpu]) highlight a specific part of a page? Lets say that my ... ideas? (be creative :) ) 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 - Load/stores per cycle for recent CPU architecture generations

Inspired by this answer to FLOPS per cycle for sandy-bridge and haswell SSE2/AVX/AVX2 what are the numbers of ... 'm only asking about issues. 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 speed up fetching the results after running an sqlite query?

As an answer on my question: Is it normal that sqlite.fetchall() is so slow? it seems that fetch-all ... also very slow using the commandline. 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 of Comparison operators

In languages such as... well anything, both operators for < and <= (and their opposites) exist. Which would be faster, ... < y + 1) { blah; } 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 - PyPy 17x faster than Python. Can Python be sped up?

Solving a recent Advent of Code problem, I found my default Python was ~40x slower than PyPy. I was able to ... which did all this for free! 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 - Pointer into Java LinkedList Node

I am pushing n entries into Java LinkedList at O(1). There are few unique items i would like to ... other Java class already implemented. 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 - Code becomes slower as more boxed arrays are allocated

Edit: It turns out that things generally (not just array/ref operations) slow down the more arrays have been ... that causes for the GC. See Question&Answers more detail:os...

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

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