Recent questions tagged performance

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performance - Does a mutating struct function in swift create a new copy of self?

I like value semantics in swift but I am worried about the performance of mutating functions. Suppose we have the ... Point(x:self.x+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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847 views

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performance - JavaScript Code Works Faster when JS Profiling is on? What?

I'm facing a very strange behaviour with my application - if I start the profiler (must be JS profiler), ... be opened when running. 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 - Is str.replace(..).replace(..) ad nauseam a standard idiom in Python?

For instance, say I wanted a function to escape a string for use in HTML (as in Django's escape filter): def ... to use what I wrote before? See Question&Answers more detail:os...

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

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855 views

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performance - C# Merging Two or more Text Files side by side

using (StreamWriter writer = File.CreateText(FinishedFile)) { int lineNum = 0; while (lineNum < FilesLineCount.Min()) ... . Thanks for the help. 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 combinations without replacement for arrays - NumPy / Python

I'm after generating efficiently pairwise combinations from 1D array(s). Itertools is just too inefficient with if n > ... thing to it is here. See Question&Answers more detail:os...

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

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942 views

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performance - GIN index on smallint[] column not used or error "operator is not unique"

create table test( id serial primary key, tagged smallint[] ); There is gin index on tagged column, with _int2_ops ... that will 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 - Do comments get translated to machine code? C++

When a program written in C++ has comments, are those comments translated into machine language or do they never ... compile or run any slower? 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 definition of Floating Point Operations ( FLOPs )

I'm trying to optimize my code with SIMD ( on ARM CPUs ), and want to know its arithmetic intensity ( ... point values or vectors as inputs. 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 - Can we avoid interning of strings in java?

Can we completely disable interning of strings. It might not be really helpful, but just a thought. I can think ... still...) Any thoughts!! 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 - Large 'sync' value for ParallelGCFailedAllocation

Sometimes I see long pauses in my gc.log 2014-07-18T18:42:26.137+0400: 7846.980: [GC [PSYoungGen: 86267K-> ... does 'sync' mean in this context? 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 - Benchmarking - How to count number of instructions sent to CPU to find consumed MIPS

Consider I have a software and want to study its behavior using a black-box approach. I have a 3.0GHz CPU ... be appreciated (in any language). See Question&Answers more detail:os...

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

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954 views

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performance - Release required module from Node.js

How can one release a Node.js module during runtime in order to save memory or improve the overall performance ... . Any insights? 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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1.3k views

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performance - Why am I receiving Response code: Non HTTP response code: java.net.SocketException?

I am trying to send requests using JMeter to my application that is running on localhost but many of the ... shots of my JMeter configuration See Question&Answers more detail:os...

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

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927 views

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performance - Python string concatenation Idiom. Need Clarification.

From http://jaynes.colorado.edu/PythonIdioms.html "Build strings as a list and use ''.join at the end. join ... time and B is quadratic 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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880 views

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performance - Recursion, memoization and mutable default arguments in Python

"Base" meaning without just using lru_cache. All of these are "fast enough" -- I'm not looking for the ... apparent gains in execution speeds. See Question&Answers more detail:os...

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

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890 views

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performance - Julia vs. MATLAB - Distance Matrix - Run Time Test

I started learning Julia not a long time ago and I decided to do a simple comparison between Julia and Matlab on a simple ... n) - 2.0.*GG) 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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761 views

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performance - According to Intel my cache should be 24-way associative though its 12-way, how is that?

According to Intel 64 and IA-32 architectures optimization reference manual, April 2012 page 2-23 The physical ... readings are very welcome. 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 - Get median from AVL tree?

If you have an AVL tree, what's the best way to get the median from it? The median would be defined as the ... indexes. Is there a better way? See Question&Answers more detail:os...

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

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953 views

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performance - DevExpress controls for WPF load time

When i use DevExpress controls for WPF-load time of the window on which they are declared-increases. But on ... First load is still long. See Question&Answers more detail:os...

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

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783 views

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performance - What factors can cause Stored Procedure Recompilation on SQL Server?

What factors should I be aware of that can cause excessive stored procedure recompilation? Examples of the code ... will cause a recompile. See Question&Answers more detail:os...

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

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850 views

1 answer

performance - Python - Speed up for converting a categorical variable to it's numerical index

I need to convert a column of categorical variables in a Pandas data frame into a numerical value that ... advance for any thoughts. See Question&Answers more detail:os...

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

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739 views

1 answer

performance - Supplying 64 bit specific versions of your software

Would I expect to see any performance gain by building my native C++ Client and Server into 64 bit code? What sort ... I'm not sure what 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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732 views

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performance - Packing BCD to DPD: How to improve this amd64 assembly routine?

I'm writing a routine to convert between BCD (4 bits per decimal digit) and Densely Packed Decimal (DPD) (10 ... byte 0x6e .size lookup,.-lookup 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 - Javascript improved native for loop

I have just installed Aptana Studio for development and one of the available commands for Javascript is Insert a for ... than the first one? See Question&Answers more detail:os...

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

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788 views

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performance - When does `modify` copy the vector?

From https://hackage.haskell.org/package/vector-0.12.0.1/docs/Data-Vector.html#v:modify Apply a destructive ... will be modified in place? 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 - C# - For-loop internals

a quick, simple question from me about for-loops. Situation I'm currently writing some high-performance code when I ... under my happy rock! :) See Question&Answers more detail:os...

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

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842 views

1 answer

performance - Why do SSE instructions preserve the upper 128-bit of the YMM registers?

It seems to be a recurring problem that many Intel processors (up until Skylake, unless I'm wrong) exhibit ... registers? Is it ever useful? See Question&Answers more detail:os...

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

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751 views

1 answer

performance - Algorithm to find max cost path of length N in matrix, from [0,0] to last row

I have a n*n matrix, where each element represents an integer. Starting in [0,0] I have to find the path ... Guimar?es, http://ideone.com/0iLS2 See Question&Answers more detail:os...

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

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