Recent questions tagged performance

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performance - Why does the java DirectoryStream perform so slow?

I've done some testing with Streams in special with DirectoryStreams of the nio-package. I simply try to ... an Object is bursting performance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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875 views

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performance - Efficient sse shuffle mask generation for left-packing byte elements

What would be an efficient way to optimize the following code with sse ? uint16_t change1= ... ; uint8_t* pSrc = . ... )); pDest += e0.offset; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Join with Pythons sqlite module is slower than doing it manually

I am using pythons built-in sqlite3 module to access a database. My query executes a join between a table of ... slow with the sqlite3-module. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Do modern Java compilers/JVM inline functions/methods which are called exactly from one place?

I found out that the C++ compiler does so but I want to know if the Java compiler does the same since in that ... tell me and I will remove it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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922 views

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performance - High cost of polymorphism in Java Hotspot server

When I run my timing test program in Java Hotspot client, I get consistent behavior. However, when I run it in ... System.out.println(r); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why does this code using streams run so much faster in Java 9 than Java 8?

I discovered this while solving Problem 205 of Project Euler. The problem is as follows: Peter has nine four-sided ... build 9+181, mixed mode) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Fastest Linux system call

On an x86-64 Intel system that supports syscall and sysret what's the "fastest" system call from 64-bit user code ... runtime (e.g., getpid). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - jQuery what is faster: selectors or methods?

Let's say I have $('mySelector:first'); and $('mySelector').first();. Which way is the most efficient? I looked in the ... ( i, +i + 1 ); }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - How to Optimize the Use of the "OR" Clause When Used with Parameters (SQL Server 2008)

I wonder if there is any wise way to rewrite the following query so that the indexes on columns get used ... other workaround for this problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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876 views

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performance - Xcode 4.3.2 and 100% CPU constantly in the idle time

My Xcode started to behave very heavily from yesterday when working on medium size project (around 200 source files). ... " based on defaults: 1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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895 views

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performance - Best practice when working with sparse matrices

This question is based on a discussion in this question. I have been working with sparse matrices earlier and ... to the new elements. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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953 views

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performance - How to use scala.collection.immutable.List in a Java code

I need to write a code that compares performance of Java's ArrayList with Scala's List. I am having a hard ... Java but have never used Scala. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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951 views

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performance - Limiting java application's memory and cpu usage

Say, "run myApp.jar with cpu=800 and memory=1024" Ive been doing java programming for many years and it is ... I may be using wrong keywords. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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performance - Does field type matter in a MongoDB index?

Here are two examples of a document structure in MongoDB. { UserId: "123", UserName: "Usain Bolt" } { ... between the above two examples? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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836 views

1 answer

performance - Xcode 4.3.2 and 100% CPU constantly in the idle time

My Xcode started to behave very heavily from yesterday when working on medium size project (around 200 source files). ... " based on defaults: 1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

909 views

1 answer

performance - Best practice when working with sparse matrices

This question is based on a discussion in this question. I have been working with sparse matrices earlier and ... to the new elements. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

875 views

1 answer

performance - How to use scala.collection.immutable.List in a Java code

I need to write a code that compares performance of Java's ArrayList with Scala's List. I am having a hard ... Java but have never used Scala. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

952 views

1 answer

performance - Limiting java application's memory and cpu usage

Say, "run myApp.jar with cpu=800 and memory=1024" Ive been doing java programming for many years and it is ... I may be using wrong keywords. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

955 views

1 answer

performance - Does field type matter in a MongoDB index?

Here are two examples of a document structure in MongoDB. { UserId: "123", UserName: "Usain Bolt" } { ... between the above two examples? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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832 views

1 answer

performance - Does every c++ member function take `this` as an input implicitly?

When we create a member function for a class in c++, it has an implicit extra argument that is a pointer ... , but I'm just curious. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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859 views

1 answer

performance - At what point are WebSockets less efficient than Polling?

While I understand that the answer to the above question is somewhat determined by your application's architecture, ... updates to the database. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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886 views

1 answer

performance - Why does my code run slower when I remove bounds checks?

I'm writing a linear algebra library in Rust. I have a function to get a reference to a matrix cell at a ... code is slightly slower all round). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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956 views

1 answer

performance - Division by a constant using shifts and adds/subtracts

Hi all I'm trying to divide by an unsigned constant using only shifts and adds/subtracts - I have no ... more accurate solution? Many thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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862 views

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performance - Two simple codes to generate divisors of a number. Why is the recursive one faster?

While solving a problem, I had to calculate the divisors of a number. I have two implementations that produce all ... user 0m7.036s sys 0m0.020s See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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performance - Efficiently counting number of unique elements - NumPy / Python

When running np.unique(), it first flattens the array, sorts the array, then finds the unique values. When I ... array other than np.unique()? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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879 views

1 answer

performance - What's the ideal implementation for the Sieve of Eratosthenes between Lists, Arrays, and Mutable Arrays?

In Haskell, I've found three simple implementations of the Sieve of Eratosthenes on the Rosetta Code page. Now my ... Integer rather than Int... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

performance - Date roll-up in R

I have a dataset that looks as the following: ID FromDate ToDate SiteID Cost 1 8/12/2014 8/31/2014 12 245. ... way/package to use for this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

performance - What's the most efficient way to marshal C++ structs to C#?

I am about to begin reading tons of binary files, each with 1000 or more records. New files are added ... know of an alternative method. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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