Recent questions tagged Performance

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performance - Why Python is so slow for a simple for loop?

We are making some kNN and SVD implementations in Python. Others picked Java. Our execution times are very different. ... if I use it correctly? 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 - SQL primary key: integer vs varchar

The team I'm working with decided to create a table with a varchar primary key. This table is referenced by another ... . Do you have any tips? See Question&Answers more detail:os...

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

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730 views

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performance - In Javascript, is it expensive to use try-catch blocks even if an exception is never thrown?

Is it "slow" to use several try-catch blocks when no exceptions are thrown in any of them? My question is ... because of this try-catch blocks? 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 query runs slow in SSRS

I have an SSRS report that calls out to a stored procedure. If I run the stored procedure directly from ... slow in this particular environment? See Question&Answers more detail:os...

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

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515 views

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performance - Minify Html output of ASP.NET Application

What are the ways by which we can reduce the size of the HTML Response sent by an asp.net application? I am ... which can do this stuff 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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588 views

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performance - JavaScript Objects as Hashes? Is the complexity greater than O(1)?

For some algorithm I was writing recently I thought that a hash would be excellent. I thought that I could ... vs others) what are they? 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

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performance - How to write super-fast file-streaming code in C#?

I have to split a huge file into many smaller files. Each of the destination files is defined by an offset and ... into the Buffer in 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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678 views

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performance - Entity Framework query slow, but same SQL in SqlQuery is fast

I'm seeing some really strange perf related to a very simple query using Entity Framework Code-First with .NET ... between the two. What gives? See Question&Answers more detail:os...

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

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520 views

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performance - Best timing method in C?

What is the best way to time a code section with high resolution and portability? /* Time from here */ ... have a cross-platform solution? 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 - Has anyone actually implemented a Fibonacci-Heap efficiently?

Has anyone of you ever implemented a Fibonacci-Heap? I did so a few years back, but it was several ... some details would be 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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848 views

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performance - postgresql COUNT(DISTINCT ...) very slow

I have a very simple SQL query: SELECT COUNT(DISTINCT x) FROM table; My table has about 1.5 million rows. ... the same 7.5s execution 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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585 views

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performance - What is the difference between spark.sql.shuffle.partitions and spark.default.parallelism?

What's the difference between spark.sql.shuffle.partitions and spark.default.parallelism? I have tried to set both ... stage is always 200. See Question&Answers more detail:os...

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

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663 views

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performance - MongoDB ranged pagination

It's said that using skip() for pagination in MongoDB collection with many records is slow and not ... when using ranged pagination? See Question&Answers more detail:os...

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

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584 views

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performance - Creating an empty list in Python

What is the best way to create a new empty list in Python? l = [] or l = list() I am asking this ... - which one is the standard convention. See Question&Answers more detail:os...

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

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503 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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545 views

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performance - Minimizing overhead due to the large number of Numpy dot calls

My problem is the following, I have an iterative algorithm such that at each iteration it needs to perform several ... a loop of Numpy dots? See Question&Answers more detail:os...

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

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625 views

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performance - x86_64: is IMUL faster than 2x SHL + 2x ADD?

When looking at the assembly produced by Visual Studio (2015U2) in /O2 (release) mode I saw that this ... with modern Intel x86_64 processors? 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 - Why is the final reduce step extremely slow in this MapReduce? (HiveQL, HDFS MapReduce)

Some background information: I'm working with Dataiku DSS, HDFS, and partitioned datasets. I have a particular job running ( ... ,329 Stage-1 map = 100%, reduce = 41%, Cumulative...

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

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405 views

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performance - Efficiently color cycling an image in Java

I'm writing a Mandelbrot fractal viewer, and I would like to implement color cycling in a smart way. Given an ... 215); return newColors; } } See Question&Answers more detail:os...

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

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529 views

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performance - Will enabling XDebug on a production server make PHP slower?

The title pretty much says it all...is it a bad idea ? I'd like to have the enhanced debug ... VirtualHost that defines the testing sites. 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

1 answer

performance - SQL Server Query: Fast with Literal but Slow with Variable

I have a view that returns 2 ints from a table using a CTE. If I query the view like this it runs in ... results even if I clear the cache. 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 - jQuery :first vs. .first()

The .first() method was added in jQuery 1.4. The :first selector has been around since 1.0. From ... ? Performance? Please provide examples. See Question&Answers more detail:os...

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

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596 views

1 answer

performance - What is the optimal length for an email address in a database?

Here is an extracted portion of my query, reflecting the EMAIL_ADDRESS column data type and property: EMAIL_ADDRESS ... address in a database? 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

1 answer

performance - Setup HTTP expires headers using PHP and Apache

How can I setup expires headers in PHP + Apache? I'm currently using an auto_prepend to serve resources gzipped but ... How can I set these up? See Question&Answers more detail:os...

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

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615 views

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performance - Why is tuple faster than list in Python?

I've just read in "Dive into Python" that "tuples are faster than lists". Tuple is immutable, and list is ... did a performance test 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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414 views

1 answer

performance - What are the rules for the "Ω(n log n) barrier" for sorting algorithms?

I wrote a simple program that sorts in O(n). It is highly memory inefficient, but that's not the point. It ... the result in a funky format? See Question&Answers more detail:os...

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

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532 views

1 answer

performance - What is the fastest Java collection with the basic functionality of a Queue?

What is the fastest collection in Java? I only need the operations to add and remove, order is not ... is the faster Queue implementation. See Question&Answers more detail:os...

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

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580 views

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performance - atomic operation cost

What is the cost of the atomic operation (any of compare-and-swap or atomic add/decrement)? How much cycles ... x86_64, PowerPC, SPARC, Itanium. See Question&Answers more detail:os...

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

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