Recent questions tagged performance

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performance - What is the best approach in python: multiple OR or IN in if statement?

What is the best approach in python: multiple OR or IN in if statement? Considering performance and best pratices. if ... ','4']: Thank you. See Question&Answers more detail:os...

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

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486 views

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performance - Will using longs instead of ints benefit in 64bit java

In a 64 bit VM, will using longs instead of ints do any better in terms of performance given that longs are 64 ... then mask the top 32 bits. See Question&Answers more detail:os...

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

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490 views

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performance - Read large amount of data from file in Java

I've got text file that contains 1 000 002 numbers in following formation: 123 456 1 2 3 4 5 6 .... ... data in ./test_grz file is correct. See Question&Answers more detail:os...

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

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524 views

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performance - Ignoring a NULL parameter in T-SQL

I want to be able to pass in a list of parameters, and ignore the ones which are NULL. So that the query ... times is a big performance hit. See Question&Answers more detail:os...

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

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423 views

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performance - Can I (and do I ever want to) set the maximum heap size in .net?

Coming from a java background, one of the things I am used to is telling the JVM what the maximum heap ... Java blinkers stop me from seeing? See Question&Answers more detail:os...

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

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426 views

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performance - Is there a reason Python 3 enumerates slower than Python 2?

Python 3 appears to be slower in enumerations for a minimum loop than Python 2 by a significant margin, which ... "long" processing runs slower. See Question&Answers more detail:os...

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

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560 views

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performance - PHP image resize on the fly vs storing resized images

I'm building a image sharing site and would like to know the pros and cons of resizing images on the fly ... any helpful links on the subject. See Question&Answers more detail:os...

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

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472 views

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performance - What is faster: ScriptDb or SpreadsheetApp?

Let's say I have a a script that iterates over a list of 400 objects. Each object has anywhere from 1 to ... doing it in one bulk operation). See Question&Answers more detail:os...

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

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552 views

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performance - How do I dynamically load Google Analytics JavaScript?

Without using any other JS frameworks (dojo, jquery, etc), how would I dynamically load Google Analytic's ... dynamically-on-document-load.html See Question&Answers more detail:os...

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

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554 views

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performance - Big execution time difference between java Lambda vs Anonymous class

I was curious about performance of creation of java8 lambda instances against the same anonymous class. (Measurement ... in handling of closure? See Question&Answers more detail:os...

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

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569 views

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performance testing - How do threads and number of iterations impact test and what is JMeter’s max. thread limit

Would you please tell me the max limit of no. of threads that i can use in JMeter 2.4 for conducting a ... any difference in terms of result? See Question&Answers more detail:os...

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

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577 views

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performance - Are doubles faster than floats in C#?

I'm writing an application which reads large arrays of floats and performs some simple operations with them. I' ... anyone elaborate on this? See Question&Answers more detail:os...

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

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458 views

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performance - Trouble converting long list of data.frames (~1 million) to single data.frame using do.call and ldply

I know there are many questions here in SO about ways to convert a list of data.frames to a single data.frame using do ... ): [1] tools_2.14.1 > See Question&Answers more detail:os...

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

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766 views

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performance - C++ 11 auto compile time or runtime?

auto a = 10; When compiler knows a is int, at compile time or at run-time? If it deduce type at run-time, will it not affect performance? 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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759 views

1 answer

performance - Difference between ElapsedTicks, ElapsedMilliseconds, Elapsed.Milliseconds and Elapsed.TotalMilliseconds? (C#)

I'm totally confused between these 4. What is the difference between ElapsedMilliseconds (long), ElapsedTicks ( ... anything detailed 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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524 views

1 answer

performance - How to set initial size for a dictionary in Python?

I'm putting around 4 million different keys into a Python dictionary. Creating this dictionary takes about 15 minutes ... on different key... See Question&Answers more detail:os...

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

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620 views

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performance - Which SQL statement is faster? (HAVING vs. WHERE...)

SELECT NR_DZIALU, COUNT (NR_DZIALU) AS LICZ_PRAC_DZIALU FROM PRACOWNICY GROUP BY NR_DZIALU HAVING NR_DZIALU = 30 or ... 30 GROUP BY NR_DZIALU See Question&Answers more detail:os...

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

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608 views

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performance - Fast algorithms for computing the factorial

I found this page describing a number of algorithms for computing the factorial. Unfortunately, the explanations are terse ... my hands on it. See Question&Answers more detail:os...

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

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448 views

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performance - Inline function v. Macro in C -- What's the Overhead (Memory/Speed)?

I searched Stack Overflow for the pros/cons of function-like macros v. inline functions. I found the following ... great insight 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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740 views

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performance - Does python logging flush every log?

When I write a log to file using the standard module logging, will each log be flushed to disk separately? For ... so, will it slow down ? See Question&Answers more detail:os...

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

0 votes

608 views

1 answer

performance - How to find pair with kth largest sum?

Given two sorted arrays of numbers, we want to find the pair with the kth largest possible sum. (A pair is ... .It DOESN'T contain the answer. See Question&Answers more detail:os...

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

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1.1k views

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performance - What is the time complexity of HashMap.containsKey() in java?

I need to know: What is the time complexity of HashMap.containsKey() in java? See Question&Answers more detail:os...

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

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645 views

1 answer

performance - How slow are TCP sockets compared to named pipes on Windows for localhost IPC?

I am developing a TCP Proxy to be put in front of a TCP service that should handle between 500 and 1000 ... here is the project source 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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642 views

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performance - Fast way to copy dictionary in Python

I have a Python program that works with dictionaries a lot. I have to make copies of dictionaries thousands of ... ? What would be fastest? See Question&Answers more detail:os...

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

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450 views

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performance - How are cache memories shared in multicore Intel CPUs?

I have a few questions regarding Cache memories used in Multicore CPUs or Multiprocessor systems. (Although not ... processor's cache memory? See Question&Answers more detail:os...

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

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538 views

1 answer

performance - JavaScript Profiler in IE

Does anyone know a tool for Profiling JavaScript in IE? List available: IE8 (Internet Explorer 8 only) JavaScript Profiler YUI! See Question&Answers more detail:os...

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

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623 views

1 answer

performance - How to benchmark Swift code execution?

Is there a way/software to give precise time needed to execute a block of code written in Swift, ... ("(-date_start.timeIntervalSinceNow)") See Question&Answers more detail:os...

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

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492 views

1 answer

performance - Hashtable in C++?

I usually use C++ stdlib map whenever I need to store some data associated with a specific type of value ( ... class from the Java API. See Question&Answers more detail:os...

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

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