Recent questions tagged Performance

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How does the performance of the following two query components compare? LOWER LIKE ... LOWER(description) LIKE '%abcde% ... iLIKE '%abcde%' ... 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 - Is using java Map.containsKey() redundant when using map.get()

I have been wondering for some time whether it is allowable within best practice to refrain from using the ... much appreciate your comments. See Question&Answers more detail:os...

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

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555 views

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performance - Can I use memcpy in C++ to copy classes that have no pointers or virtual functions

Say I have a class, something like the following; class MyClass { public: MyClass(); int a,b,c; double x,y,z; ... not something I'm keen to do. 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 load data quickly into R?

I have some R scripts, where I have to load several dataframe in R as quickly as possible. This is ... the help of microbenchmark package. 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 - Here we go again: append an element to a list in R

I am not happy with the accepted answer to Append an object to a list in R in amortized constant time? > list1 ... Is there a more elegant way? See Question&Answers more detail:os...

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

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696 views

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performance - Java compile speed vs Scala compile speed

I've been programming in Scala for a while and I like it but one thing I'm annoyed by is the time it takes ... scalac ever be as fast as javac. See Question&Answers more detail:os...

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

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882 views

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performance - Would it help to add index to BIGINT column in MySQL?

I have a table that will have millions of entries, and a column that has BIGINT(20) values ... FROM table1 WHERE my_big_number=19287319283784 See Question&Answers more detail:os...

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

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828 views

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performance - improving python code in Monte Carlo simulation

I've written a Monte Carlo simulation for a "2d active ising model" and I'm trying to improve the runtime ... . Any help is greatly appreciated. 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 - Is it useful to use VZEROUPPER if your program+libraries contain no SSE instructions?

I understand it's important to use VZEROUPPER when mixing SSE and AVX code but what if I only use AVX (and ... (that might be using SSE). 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 Collections and Garbage Collector

A little question regarding performance in a Java web app. Let's assume I have a List<Rubrique> listRubriques ... might create a memory leak? See Question&Answers more detail:os...

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

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799 views

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performance - Loop counter in Java API

All, While going through some of the files in Java API, I noticed many instances where the looping counter ... counter rather than increment? See Question&Answers more detail:os...

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

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762 views

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performance - How browser executes Javascript and renders asynchronously

Here is the code on jsfiddle <script> function updateSync1() { for (var i = 0; i < 1000; i++) { document. ... id="output"></span> </div> See Question&Answers more detail:os...

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

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966 views

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performance - Gif Animated Files in C# have Lower framerates than they should

ive got a full screen loading page after my software's done running,which includes a preloader gif file .... ... (its within a winform project) See Question&Answers more detail:os...

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

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1.7k views

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performance - is php sort better than mysql "order by"?

I was wondering if, in terms of performance and considering a mysql select on a table with very very very ... someone has any suggestion? Tanks See Question&Answers more detail:os...

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

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825 views

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performance - Python: Why is IDLE so slow?

IDLE is my favorite Python editor. It offers very nice and intuitive Python shell which is extremely useful for unit ... m not really sure. Adam See Question&Answers more detail:os...

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

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585 views

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performance - Python: is "except KeyError" faster than "if key in dict"?

Edit 2: It was suggested that this is a copy of a similar question. I'd disagree since my question focuses ... of bounds, negative indexes etc. See Question&Answers more detail:os...

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

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748 views

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performance - C# Dynamic Keyword — Run-time penalty?

Does defining an instance as dynamic in C# mean: The compiler does not perform compile-time type checking, ... ? potentially significant?). See Question&Answers more detail:os...

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

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720 views

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performance - Java anonymous class efficiency implications

Is there any difference in efficiency (e.g. execution time, code size, etc.) between these two ways of doing things ... void doWork() {} }; See Question&Answers more detail:os...

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

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929 views

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performance - recursive function vs setInterval vs setTimeout javascript

i am using NodeJs and need call a infinite function, but i dont know what is the best for a optimal ... to optimize the javascript performance. See Question&Answers more detail:os...

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

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654 views

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performance - Python FAQ: “How fast are exceptions?”

I was just looking at the Python FAQ because it was mentioned in another question. Having never really looked ... checking the types before.) 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

1 answer

performance - How to retrieve a list of directories QUICKLY in Java?

Suppose a very simple program that lists out all the subdirectories of a given directory. Sound simple enough? ... part of the requirement. See Question&Answers more detail:os...

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

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590 views

1 answer

performance - SET vs. SELECT - What's the difference?

Can someone please identify the functional/performance differences, if any, between SET and SELECT in T-SQL? ... speed advantage over SET. See Question&Answers more detail:os...

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

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635 views

1 answer

performance - Convert a hexadecimal string to an integer efficiently in C?

In C, what is the most efficient way to convert a string of hex digits into a binary unsigned int or ... int with the base10 value 4294967294. See Question&Answers more detail:os...

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

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707 views

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performance - Modern x86 cost model

I'm writing a JIT compiler with an x86 backend and learning x86 assembler and machine code as I go. I used ARM ... so much lately. Am I 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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636 views

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performance - How expensive are Python dictionaries to handle?

As the title states, how expensive are Python dictionaries to handle? Creation, insertion, updating, deletion, all ... tuples or normal lists. See Question&Answers more detail:os...

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

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594 views

1 answer

performance - How expensive are Python dictionaries to handle?

As the title states, how expensive are Python dictionaries to handle? Creation, insertion, updating, deletion, all ... tuples or normal lists. See Question&Answers more detail:os...

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

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593 views

1 answer

performance - Why doesn't Python's mmap work with large files?

[Edit: This problem applies only to 32-bit systems. If your computer, your OS and your python implementation are ... Not too difficult really... See Question&Answers more detail:os...

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

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728 views

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performance - When to use .NET BufferedStream class?

The MSDN site states: A buffer is a block of bytes in memory used to cache data, thereby reducing the ... class in every possible occasion? See Question&Answers more detail:os...

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

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