Recent questions tagged Performance

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performance - Why should recursion be preferred over iteration?

Iteration is more performant than recursion, right? Then why do some people opine that recursion is better (more ... light on this. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Most efficient code for the first 10000 prime numbers?

I want to print the first 10000 prime numbers. Can anyone give me the most efficient code for this? Clarifications ... the values in any manner. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Redis 10x more memory usage than data

I am trying to store a wordlist in redis. The performance is great. My approach is of making a set called ... way of approaching this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Bulk inserts taking longer than expected using Dapper

After reading this article I decided to take a closer look at the way I was using Dapper. I ran this code ... : trans); trans.Commit(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why are compilers so stupid?

I always wonder why compilers can't figure out simple things that are obvious to the human eye. They do lots of ... 't do this work for me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Practical limits of R data frame

I have been reading about how read.table is not efficient for large data files. Also how R is not suited for ... RInside, that would be great! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Searching for a string in a large text file - profiling various methods in python

This question has been asked many times. After spending some time reading the answers, I did some quick profiling ... the primary index on url See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Java Reflection: Why is it so slow?

I've always avoided Java reflection soley based on its reputation for slowness. I reached a point in the design of ... stuck with Java for now) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Getting total row count from OFFSET / FETCH NEXT

So, I've got a function that returns a number of records that I want to implement paging for on my website. ... performance, not slow it down. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why does direction of index matter in MongoDB?

To quote the docs: When creating an index, the number associated with a key specifies the direction of the ... explanation (or an example)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - simplest tool to measure C program cache hit/miss and cpu time in linux?

I'm writing a small program in C, and I want to measure it's performance. I want to see how much time do ... [pid]/stat, that is always there. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why is vectorization, faster in general, than loops?

Why, at the lowest level of the hardware performing operations and the general underlying operations involved (i.e.: things ... way, won't we? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Symfony2 Slow Initialization Time

I have Symfony2 running on an Ubuntu Server 12.04 (64-bit) VM (VirtualBox). The host is a MacBook pro. For ... 't seem to answer my questions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - How do you calculate log base 2 in Java for integers?

I use the following function to calculate log base 2 for integers: public static int log2(int n){ if(n <= 0) throw ... Math.log(n)/Math.log(2). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - dbms_output.put_line

Does dbms_output.put_line decrease the performance in plsql code? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Vectorizing Haversine distance calculation in Python

I am trying to calculate a distance matrix for a long list of locations identified by Latitude & Longitude using ... apply it in this context. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - for loop vs while loop vs foreach loop PHP

1st off I'm new to PHP. I have been using for loop,while loop,foreach loop in scripts. I wonder which one ... loop should be better to be used. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - jQuery select by class VS select by attribute

I want just to ask for an opinion of perfomance: Is it faster selecting elements by class name or by attribute ... more efficient on CPU usage? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Mongodb Aggregation Framework: Does $group use index?

I'm trying to use aggregation framework with $match and $group stages. Does $group stage use index data? I'm using ... mongodb version - 2.5.4 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Java Streams: How to do an efficient "distinct and sort"?

Let's assume I've got a Stream<T> and want to get only distinct elements and sorted. The na?ve approach would ... value; return takeValue; }; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Limitation on texture size? Android Open GL ES 2.0

I would like to know if there is any kind of limitation on the texture size that can be used in any Android ... load time and also run time. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - How to speed up Compile Time of my CMake enabled C++ Project?

I came across several SO questions regarding specific aspects of improving the turn-around time of CMake enabled ... standard settings/tools. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - How to detect android cpu speed?

I would like to detect how fast is the device on which my Android application is running? Is there any ... number of simultaneous HTTP request. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why inline JavaScript is bad?

It is always recommended to avoid inline Javascript codes by putting all codes in a JS file, which is included ... where they are not needed. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - What's the actual effect of successful unaligned accesses on x86?

I always hear that unaligned accesses are bad because they will either cause runtime errors and crash the program or ... two versions of code? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Fast algorithm implementation to sort very small list

This is the problem I ran into long time ago. I thought I may ask your for your ideas. assume I have ... 64-bit processor with SSE3 . Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Java benchmarking - why is the second loop faster?

I'm curious about this. I wanted to check which function was faster, so I create a little code and I ... become faster for the second loop. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Are NumPy's math functions faster than Python's?

I have a function defined by a combination of basic math functions (abs, cosh, sinh, exp, ...). I was ... numpy.abs() instead of abs()? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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