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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...
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performance
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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...
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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...
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performance
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779
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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...
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781
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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...
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performance
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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...
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performance
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votes
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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...
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71.8m
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performance
0
votes
830
views
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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...
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performance
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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...
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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...
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Oct 24, 2021
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performance
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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...
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Oct 24, 2021
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71.8m
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performance
0
votes
821
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...
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Oct 24, 2021
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71.8m
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performance
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votes
807
views
1
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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...
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Oct 24, 2021
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Technique[技术]
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71.8m
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performance
0
votes
896
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
708
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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
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Technique[技术]
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深蓝
(
71.8m
points)
performance
0
votes
724
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
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Technique[技术]
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深蓝
(
71.8m
points)
performance
0
votes
748
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)
performance
0
votes
841
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]
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深蓝
(
71.8m
points)
performance
0
votes
789
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
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Technique[技术]
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深蓝
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71.8m
points)
performance
0
votes
702
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
718
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
734
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
812
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...
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Oct 24, 2021
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71.8m
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performance
0
votes
722
views
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answer
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...
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Oct 24, 2021
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Technique[技术]
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71.8m
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performance
0
votes
988
views
1
answer
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...
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Oct 24, 2021
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71.8m
points)
performance
0
votes
748
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...
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71.8m
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performance
0
votes
878
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...
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71.8m
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performance
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votes
958
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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...
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Oct 24, 2021
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