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 to show AddMob in my app, if ... .system.PathClassLoader[/data/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. Everything worked fine until we went for ... Processor Type 64 Bit 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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620 views

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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 does not do full table scan and just ... very well figure out 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 speed but multiple ifelse making my code ... ifelse(is.na(x)|!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 function outer simply repeatedly makes a ... 'm separating that 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 with a non-negative sum. The numbers ... a better direction 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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628 views

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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 runs EXTREMELY slowly (10x difference): First ... ) counter++; counter -= 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 Commons Net libraries and both ... firewall conflict. Thanks 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 cores. On a multiprocessor computer, it ... DateTime.UtcNow.Ticks 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 is a significant difference in battery ... web apps? (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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484 views

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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 get a list of all files in a directory ... twice and caching in 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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621 views

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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 retrieve comes as a bidimensional array consisting ... data has been 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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869 views

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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 the log is large or the events come ... ; m_rawCommunication = val; 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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625 views

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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(new Rectangle(0, 0, _frame, _height), ... handle an array of 4 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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546 views

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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 fastest option. This is what I've come up ... what are other options 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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484 views

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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 = [d.get(next((k for k in d if k in s), ... k in s was true, put v 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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556 views

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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 about things, for two reasons: it's the ANSI ... fast? Am I ever 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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654 views

1 answer

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 database. I have set a ramp up time of ... . Is there anyway I 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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546 views

1 answer

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 of 16 bytes. How much does this ... because the function starts 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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497 views

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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 orc files etc. Is there a way to check / ... help and if so, which 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 page is as so: <html> <head> </head> ... . Do you have any other 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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613 views

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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 just-loads/loads-and-stores which one ... /memory bandwidths, I'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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767 views

1 answer

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 and fetch-one can be incredibly slow for sqlite ... busy, so it's 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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602 views

1 answer

performance - Speed of Comparison operators

In languages such as... well anything, both operators for < and <= (and their opposites) exist. Which would be faster, and how are they interpreted? if (x <= y) { blah; } or if (x < 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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387 views

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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 get that down to about 17x with this code ... with the PyPy JIT, 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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528 views

1 answer

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 remove later on at O(1). I though ... rather use LinkedList or some 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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414 views

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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 created, so I guess this might just be ... ), and whatever overhead 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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