Recent questions tagged Optimization

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optimization - What to do with Java BigDecimal performance?

I write currency trading applications for living, so I have to work with monetary values (it's a shame ... than BigDecimal. Any suggestions? See Question&Answers more detail:os...

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

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856 views

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optimization - Most efficient way of converting String to Integer in java

There are many ways of converting a String to an Integer object. Which is the most efficient among the below: ... is used for read-only. See Question&Answers more detail:os...

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

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698 views

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optimization - When do compilers inline C++ code?

In C++, do methods only get inlined if they are explicitly declared inline (or defined in a header file), or ... inline methods as they see fit? See Question&Answers more detail:os...

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

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659 views

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optimization - Speed up bitstring/bit operations in Python?

I wrote a prime number generator using Sieve of Eratosthenes and Python 3.1. The code runs correctly and ... of benchmarks on my machine. See Question&Answers more detail:os...

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

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775 views

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optimization - foldl is tail recursive, so how come foldr runs faster than foldl?

I wanted to test foldl vs foldr. From what I've seen you should use foldl over foldr when ever you can due ... a clear case where foldl wins? See Question&Answers more detail:os...

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

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765 views

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optimization - When is not a good time to use python generators?

This is rather the inverse of What can you use Python generator functions for?: python generators, generator expressions, ... (). (alt link) See Question&Answers more detail:os...

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

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640 views

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optimization - Coalesce function for PHP?

Many programming languages have a coalesce function (returns the first non-NULL value, example). PHP, sadly in ... until PHP itself gets a coalesce function? Question&Answers:os...

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

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674 views

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optimization - Speeding up row counting in MySQL

Suppose, for illustrative purposes, you are running a library using a simple MySQL "books" table with three columns ... I wasn't missing an easy alternative. Question&Answers:os...

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

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700 views

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optimization - Why does the Java API use int instead of short or byte?

Why does the Java API use int, when short or even byte would be sufficient? Example: The DAY_OF_WEEK field in ... those datatypes (short, int) exist at all? Question&Answers:os...

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

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800 views

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optimization - Is the inequality operator faster than the equality operator?

I know this is a micro-optimization, so I ask out of pure curiosity. Logically, a microprocessor does not need ... it affects the execution speed of a program. Question&Answers:os...

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

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770 views

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optimization - GCC C++ "Hello World" program -> .exe is 500kb big when compiled on Windows. How can I reduce its size?

I just recently started learning C++ - I am using nuwen's version of MingW on Windows, using NetBeans as an ... just too much for such a simple application ). Question&Answers:os...

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

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755 views

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optimization - Does multithreading make sense for IO-bound operations?

When performing many disk operations, does multithreading help, hinder, or make no difference? For example, ... and responding to disk operations is better. Question&Answers:os...

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

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774 views

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optimization - Deflate compression browser compatibility and advantages over GZIP

UPDATE Feb 10 2012: zOompf has completed some very thorough research on this very topic here. It trumps any ... testing platform has been created for this here Question&Answers:os...

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

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815 views

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optimization - Time complexity of memory allocation

What is the time complexity of dynamic memory allocation using new, malloc, etc.? I know very little about ... m really interested in the average/typical case. Question&Answers:os...

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

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790 views

1 answer

optimization - Measuring actual MySQL query time

How can I measure the execution time of a query without measuring the time it spends waiting for a lock ... measure same query and record the fastest time. Question&Answers:os...

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

0 votes

763 views

1 answer

optimization - Fastest way to convert string to integer in PHP

Using PHP, what's the fastest way to convert a string like this: "123" to an integer? Why is that particular ... unexpected input, such as "hello" or an array? Question&Answers:os...

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

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649 views

1 answer

optimization - What is copy-on-write?

I would like to know what copy-on-write is and what it is used for. The term is mentioned several times in the Sun JDK tutorials. Question&Answers:os...

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

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673 views

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optimization - How can I rank observations in-group faster?

I have a really simple problem, but I'm probably not thinking vector-y enough to solve it efficiently. I tried two different ... ]$n.obs = e i=i+1 gc() } Question&Answers:os...

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

0 votes

746 views

1 answer

optimization - Why to use StringBuffer in Java instead of the string concatenation operator

Someone told me it's more efficient to use StringBuffer to concatenate strings in Java than to use the + ... do that? What does StringBuffer do differently? Question&Answers:os...

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

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786 views

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optimization - Does adding 'LIMIT 1' to MySQL queries make them faster when you know there will only be 1 result?

When I add LIMIT 1 to a MySQL query, does it stop the search after it finds 1 result (thus making it faster ... all of the results and truncate at the end? Question&Answers:os...

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

0 votes

628 views

1 answer

optimization - SIMD instructions lowering CPU frequency

I read this article. It talked about why AVX-512 instruction: Intel's latest processors have advanced instructions ( ... my C++ application for Xeon Skylake. Question&Answers:os...

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

0 votes

788 views

1 answer

optimization - Ternary operators in JavaScript without an "else"

I've always had to put null in the else conditions that don't have anything. Is there a way around it? For example, ... obj.find('img').width()+'px' : null; Question&Answers:os...

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

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733 views

1 answer

optimization - How do I add indices to MySQL tables?

I've got a very large MySQL table with about 150,000 rows of data. Currently, when I try and run SELECT * ... VARCHAR. Could this be the source of the problem? Question&Answers:os...

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

0 votes

664 views

1 answer

optimization - Why is Swift compile time so slow?

I'm using Xcode 6 Beta 6. This is something that's been bugging me for some time now, but it's reaching ... this post after it's done. Looks promising though. Question&Answers:os...

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

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831 views

1 answer

optimization - What is an Efficient algorithm to find Area of Overlapping Rectangles

My situation Input: a set of rectangles each rect is comprised of 4 ... CCCCCCCC CCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCC Question&Answers:os...

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

0 votes

789 views

1 answer

optimization - Most efficient way to increment a Map value in Java

I hope this question is not considered too basic for this forum, but we'll see. I'm wondering how to refactor ... a test of several of the answers. See below. Question&Answers:os...

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

0 votes

623 views

1 answer

optimization - What is the purpose of the "role" attribute in HTML?

I keep seeing role attributes in some people's work. I use it too, but I'm not sure about its effect. For ... use of the role attribute? Any thoughts on this? Question&Answers:os...

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

0 votes

807 views

1 answer

optimization - How do you test running time of VBA code?

Is there code in VBA I can wrap a function with that will let me know the time it took to run, so that I can compare the different running times of functions? Question&Answers:os...

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

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