Recent questions tagged performance

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performance - Is it normal that sqlite.fetchall() is so slow?

I have an sql query that selects from two inner joined tables. The execution of the select statement takes about ... in allInfo: <do something> 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 do multiple values or ranges means as the latency for a single instruction?

I have a question about instruction latency on https://uops.info/. For some instructions like PCMPEQB(XMM, M128) ... 1 vs any higher number? 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 Java2D bilinear interpolation in Java 7 on Mac OS X

I've been testing my app in Java 7 on Mac OS X. It's running noticeable sluggish. I ... .filter(screenSliceFiltered, screenSliceFilteredScaled); 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 - libsvm compiled with AVX vs no AVX

I compiled a libsvm benchmarking app which does svm_predict() 100 times on the same image using the same model. ... JNZ 22568317 JS 2 JZ 8465164 LEA 16829548 MOV 42209235 MOVAPS...

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

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performance - Logarithm in C++ and assembly

Apparently MSVC++2017 toolset v141 (x64 Release configuration) doesn't use FYL2X x86_64 assembly instruction via ... newer x86_64 processors? 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 - scala spark dataframe explode is slow - so, alternate method - create columns and rows from arrays in a column

Scala 2.11.8, spark 2.0.1 The explode function is very slow - so, looking for an alternate method. I think ... of rows. Takes over 12 hours. 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's a fast way to space-out bits within a word?

I have a 32-bit value in the lower part of a 64-bit register; the top part is 0 (X denotes a bit with ... SM's would be the most relevant. 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 Pixel Search in Java

i have a problem regarding a pixel search in java. At the moment my Class/Programm is searching pixel by pixel thats to slow ... " + y); } } } 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 - Postgresql 9.4 - FASTEST query to select and update on large dataset (>30M rows) with heavy writes/reads and locks

I want to select one row among a large dataset (>30Million rows) with heavy writes/reads RANDOMLY. My ... advanced technique you might suggest 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 - Z3 real arithmetic and statistics

Given a problem that is encoded using Z3's reals, which of the statistics that Z3 /smt2 /st ... ) inflict significant performance penalties? 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 - Matlab: How to vectorize a nested loop over a 2D set of vectors

I have a function in the following form: function Out = DecideIfAPixelIsWithinAnEllipsoidalClass(pixel,means, ... the systam? 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 about using Angular2 + JQuery together?

I am using Angular2. I would like to implement group panel collapsable. Toward it, there are a lot of examples ... Please give me some advice. 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 - matlab: optimizing code for computing statistics in multi-scale circular neighborhoods

I've a stack of images (imgstack) over which I would like to compute some statistics (e.g. mean, std, median) in ... (:))/2 ), neigh ); end See Question&Answers more detail:os...

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

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910 views

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performance - Remove for loop from clustering algorithm in MATLAB

I am trying to improve the performance of the OPTICS clustering algorithm. The implementation i've found in open source ... .'; end many 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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909 views

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performance - fast matrix multiplication in Matlab

I need to make a matrix/vector multiplication in Matlab of very large sizes: "A" is an 655360 by 5 ... operation is more efficient? 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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847 views

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performance - In JavaScript, which method of creating an object with properties is most efficient?

I'm a little new to JavaScript. I've used it here and there on the client-side for a while, but now ... my object definitions that way. 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 - Why is Python's 'all' function so slow?

I have wrote some very simple tests (I know, they are not 'conclusive', but they make me curious). I ran ... function doesn't bail out early? See Question&Answers more detail:os...

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

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765 views

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performance - what is the easiest way for opcode caching with PHP/Apache?

I was thinking to use opcode caching for performance profit what is the easiest way for opcode caching with PHP/ ... there are more options ? See Question&Answers more detail:os...

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

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854 views

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performance - Memory benchmark plot: understanding cache behaviour

I've tried every kind of reasoning I can possibly came out with but I don't really understand this plot. ... com/u/18373264/membench/membench.c 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 INNER JOIN question

I'm creating a query that will display information for a record which is derived from 8 tables. The ... be employing a different technique. See Question&Answers more detail:os...

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

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900 views

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performance - JDK7 Application is getting slow after some Uptime

We have a large JDK7 application deployed on JBoss using several libraries like Hibernate, Spring and so on. After ... What's going on there? See Question&Answers more detail:os...

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

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928 views

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performance impact of order of rewrite rules when using apache mod_rewrite

while i have read about the 'sometimes un-obvious way' that mod_rewrite handles the various rewrite rules you feed ... near the bottom? 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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893 views

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performance - Resize the images according screen resolution Android

I have a background image in body. What I want to achieve is that: 1) - Calculate the visitor screen resolution. ... . Can anyone help? 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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930 views

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performance - java increase xmx dynamically at runtime

I have a jvm server in my machine, now I want to have 2 apservers of mine sitting in same machine, however I ... for me to achieve 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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811 views

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performance - Calculating the first triangle number to have over 500 divisors in python

I'm trying to solve the 12th problem on Project Euler. I can calculate the number that has over 500 divisors ... ) print(time.time()-startTime) See Question&Answers more detail:os...

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

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849 views

1 answer

performance - Efficient way to create a circulant matrix in R

I want to create a circulant matrix from a vector in R. A circulant matrix is a matrix with the following form ... a big difference. Thank you. 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 - Fastest way to transpose a list in R / Rcpp

I have a list: ls <- list(c("a", "b", "c"), c("1", "2", "3"), c("foo", "bar", "baz")) ls ... )? in R (if this is not the case already) with Rcpp See Question&Answers more detail:os...

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

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737 views

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performance - Android Studio Takes too long time to run the app on real device

I have a Laptop with a Core i3 processor and a 2GB of RAM, and I am using my Sony Xperia C as an ... true about the cause being something else. See Question&Answers more detail:os...

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

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