ThreadPool | A simple C++11 Thread Pool implementation

by progschj C++ Version: Current License: Zlib

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | ThreadPool Summary

ThreadPool is a C++ library. ThreadPool has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

A simple C++11 Thread Pool implementation.

Support

Quality

Security

License

Reuse

Support

ThreadPool has a medium active ecosystem.

It has 6518 star(s) with 2022 fork(s). There are 225 watchers for this library.

It had no major release in the last 6 months.

There are 29 open issues and 43 have been closed. On average issues are closed in 35 days. There are 12 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of ThreadPool is current.

Quality

ThreadPool has no bugs reported.

Security

ThreadPool has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

ThreadPool is licensed under the Zlib License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

ThreadPool releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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ThreadPool Key Features

No Key Features are available at this moment for ThreadPool.

ThreadPool Examples and Code Snippets

No Code Snippets are available at this moment for ThreadPool.

Community Discussions

Trending Discussions on ThreadPool

for loop Multiprocessing or Multithreading in Python

java how to create thread pool for stream operation

Get C FILE pointer from bytes::Bytes in Rust

how to keep a gap of 5 seconds in every batch of request in c#

Downloading multiple urls with threadpool

Generator in threading

Spring Rabbit CachingConnectionFactory Thread Pool

JAX-RS and RegEx @Paths with spaces

Rust showing expected trait object `dyn Future`, found opaque type when passing function as a param

MariaDB optimization for Woocommerce store with more than 55k articles on sale soon

QUESTION

for loop Multiprocessing or Multithreading in Python

Asked 2021-Jun-13 at 18:03

I have the following three for loop (two of them are nested) in python. The API requests should be sent concurrently. How to parallelized the execution?

...

ANSWER

Answered 2021-Jun-13 at 18:03

Looking at the three instances of apiString and rewriting them to use the more succinct F-strings, they all appear to be of the form:

Source https://stackoverflow.com/questions/67916776

QUESTION

java how to create thread pool for stream operation

Asked 2021-Jun-12 at 20:33

I like to control the thread execution when using streams with a thread pool. Currently i have List of string

...

ANSWER

Answered 2021-Jun-12 at 20:33

The code compiles and runs fine, once the code errors are fixed (str => s).

Common Pool

Source https://stackoverflow.com/questions/67952425

QUESTION

Get C FILE pointer from bytes::Bytes in Rust

Asked 2021-Jun-12 at 13:29

I would like to read a GRIB file downloaded from server using ecCodes library in Rust. However, my current solution results in segmentation fault. The extracted example, replicating the problem, is below.

I download the file using reqwest crate and get the response as Bytes¹ using bytes(). To read the file with ecCodes I need to create a codes_handle using codes_grib_handle_new_from_file()², which as argument requires *FILE usually get from fopen(). However, I would like to skip IO operations. So I figured I could use libc::fmemopen() to get *FILE from Bytes. But when I pass the *mut FILE from fmemopen() to codes_grib_handle_new_from_file() segmentation fault occurs.

I suspect the issue is when I get from Bytes a *mut c_void required by fmemopen(). I figured I can do this like that:

...

ANSWER

Answered 2021-Jun-12 at 13:29

1- Try changing

Source https://stackoverflow.com/questions/67948101

QUESTION

how to keep a gap of 5 seconds in every batch of request in c#

Asked 2021-Jun-06 at 14:49

I have a written an application in c# that receives a request from another application and sends a request to an external broker via HTTP. broker accepts only 40 requests at a time. so I have a config where I mention the count. Broker is asking us to send 40 requests in one batch and another 40 in another batch but there should be a gap of 5 seconds. my question is how to call a method at a specific time. Presently 2 batches each with 40 requests go at the same time. My Present code looks like this. I need some idea how can I handle this .. Help will be highly appreciated. thanks.

...

ANSWER

Answered 2021-Jun-06 at 14:49

Add the following code before calling the method:

Source https://stackoverflow.com/questions/67860188

QUESTION

Downloading multiple urls with threadpool

Asked 2021-Jun-03 at 19:08

I having problem downloading multiple urls. My code still only download 1 url per session. Still need to finish the first one before downloading the next one.

I want to download like 3 urls at the same time.

Here's my code:

...

ANSWER

Answered 2021-Jun-03 at 19:08

This line

Source https://stackoverflow.com/questions/67824562

QUESTION

Generator in threading

Asked 2021-Jun-03 at 03:27

I have a generator that returns me a certain string, how can I use it together with this code?

...

ANSWER

Answered 2021-Jun-03 at 03:27

Essentially the same question that was posed here.

The essence is that multiprocessing will convert any iterable without a __len__ method into a list.

There is an open issue to add support for generators but for now, you're SOL.

If your array is too big to fit into memory, consider reading it in in chunks, processing it, and dumping the results to disk in chunks. Without more context, I can't really provide a more concrete solution.

UPDATE:

Thanks for posting your code. My first question, is it absolutely necessary to use multiprocessing? Depending on what my_function does, you may see no benefit to using a ThreadPool as python is famously limited by the GIL so any CPU bound worker function wouldn't speed up. In this case, maybe a ProcessPool would be better. Otherwise, you are probably better off just running results = map(my_function, generator).

Of course, if you don't have the memory to load the input data, it is unlikely you will have the memory to store the results.

Secondly, you can improve your generator by using itertools

Try:

Source https://stackoverflow.com/questions/67814650

QUESTION

Spring Rabbit CachingConnectionFactory Thread Pool

Asked 2021-Jun-02 at 19:21

I have around 10 different rabbit mq queues in 10 different virtual hosts to connect to. For each queue, a separate SimpleMessageListenerContainer bean is defined in my spring boot application and a separate Spring Integration flow is created using each specific SimpleMessageListenerContainer.

The concurrency for SimpleMessageListenerContainer is set to 1-3. Each of the SimpleMessageListenerContainer bean is using separate CachingConnectoryFacory beans. The Connection Factory mode is set as CHANNEL.

We also have another IntegrationFlow to publish messages to an outbound queue that is using a different connection factory. I am not setting any ThreadPool Task Executors in the ConnectionFactory, so it using the default one. While doing the Load test we are noticing that the multiple thread pool (prefixed with pool-) are getting crated and after a certain point application crashes may due to the high number of threads.

It looks like the default thread pool executor is having max value of Integer unbounded which may spinning up threads based on the demand. I tried setting custom Thread Pool task executors for each connection factory and I noticed that the threads are not growing like previously but from the java profiler it shows the SimpleMessageListenerContainer threads are getting BLOCKED frequently.

I want to know if there any best practices or to be followed while setting the custom thread pool task executors in the connection factory like a ratio between Lisneter threads and connection factory threads etc?

...

ANSWER

Answered 2021-May-27 at 19:45

I have done some debugging; ...-1 gets renamed to, for example AMQP Connection 127.0.0.1:5672.

That thread is not from the pool, but it is created by the same thread factory.

Similarly, the scheduled executor (for heartbeats) uses the same thread factory, and gets ...-2.

Hence the pool starts at ...-3. So indeed, you have a fixed pool of 8 threads, an I/O thread, and a heartbeat thread for each factory.

With a large number of factories like that, you probably don't need so many threads; I would suggest a single pooled executor with sufficient threads to satisfy your workload; experimentation is probably the only way to determine the number, but I would guess it's something less than 88 (11x8).

Source https://stackoverflow.com/questions/67709735

QUESTION

JAX-RS and RegEx @Paths with spaces

Asked 2021-May-27 at 19:58

Spaces in URIs are allowed if they're encoded, as discussed here.

JAX-RS (Jersey on Payara) doesn't seem to allow spaces defined in the path regex pattern.

...

ANSWER

Answered 2021-May-27 at 19:58

Regex patterns are not encoded, but Jersey match URLs in encoded form.

This workaround should work:

Source https://stackoverflow.com/questions/67709901

QUESTION

Rust showing expected trait object `dyn Future`, found opaque type when passing function as a param

Asked 2021-May-25 at 06:45

use std::io::prelude::*;
use std::net::TcpListener;
use std::net::TcpStream;
use std::time::Duration;

// pyO3 module
use pyo3::prelude::*;
use pyo3::wrap_pyfunction;

use std::future::Future;

#[pyfunction]
pub fn start_server() {
    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
    let pool = ThreadPool::new(4);

    for stream in listener.incoming() {
        let stream = stream.unwrap();

        pool.execute(|| {
            let rt = tokio::runtime::Runtime::new().unwrap();
            handle_connection(stream, rt, &test_helper);
        });
    }
}

#[pymodule]
pub fn roadrunner(_: Python<'_>, m: &PyModule) -> PyResult<()> {
    m.add_wrapped(wrap_pyfunction!(start_server))?;
    Ok(())
}

async fn read_file(filename: String) -> String {
    let con = tokio::fs::read_to_string(filename).await;
    con.unwrap()
}

async fn test_helper(contents: &mut String, filename: String) {
    // this function will accept custom function and return
    *contents = tokio::task::spawn(read_file(filename.clone()))
        .await
        .unwrap();
}

pub fn handle_connection(
    mut stream: TcpStream,
    runtime: tokio::runtime::Runtime,
    test: &dyn Fn(&mut String, String) -> (dyn Future + 'static),
) {
    let mut buffer = [0; 1024];
    stream.read(&mut buffer).unwrap();

    let get = b"GET / HTTP/1.1\r\n";
    let sleep = b"GET /sleep HTTP/1.1\r\n";

    let (status_line, filename) = if buffer.starts_with(get) {
        ("HTTP/1.1 200 OK", "hello.html")
    } else if buffer.starts_with(sleep) {
        thread::sleep(Duration::from_secs(5));
        ("HTTP/1.1 200 OK", "hello.html")
    } else {
        ("HTTP/1.1 404 NOT FOUND", "404.html")
    };

    let mut contents = String::new();
    let future = test_helper(&mut contents, String::from(filename));
    runtime.block_on(future);

    let response = format!(
        "{}\r\nContent-Length: {}\r\n\r\n{}",
        status_line,
        contents.len(),
        contents
    );

    stream.write(response.as_bytes()).unwrap();
    stream.flush().unwrap();
}

...

ANSWER

Answered 2021-May-25 at 06:45

You are writing a function type that returns a dyn type, not a reference to it, but the unsized type itself, that is not possible. Every time you want to write something like this, try using a generic instead:

Source https://stackoverflow.com/questions/67682758

QUESTION

MariaDB optimization for Woocommerce store with more than 55k articles on sale soon

Asked 2021-May-24 at 18:37

and I appreciate in advance for your help on this. I have a VPS with the following specs:

OS: Centos 7.x CPU Model: Common KVM processor CPU Details: 6 Core(2200 MHz) Distro Name: CentOS Linux release 7.9.2009 (Core) Kernel Version: 3.10.0-1160.25.1.el7.x86_64 Database: Server type: MariaDB Server version: 10.2.38-MariaDB - MariaDB Server

And here is mu sqltuner output from letting it run after 48 hours and uptime.

...

ANSWER

Answered 2021-May-24 at 18:37

Rules for memory allocation.

Do not allocate so much RAM that swapping will occur. Swapping is terrible for MySQL/MariaDB performance.
Do adjust innodb_buffer_pool_size such that most of RAM is in use during normal time and even for spikes in activity. (I often say "set it to 70% of available RAM", but you are asking for more details.)
Do not bother changing other settings; they add to the complexity of "getting it right".

There are 3 situations (based on innodb_buffer_pool_size and dataset size):

Tiny dataset -- buffer_pool is bigger than necessary --> wasting some of RAM, but so what; it is not useful for anything else. And it give you some room for growth.
Medium-sized dataset -- Most activity is done in RAM; the system will run nicely.
Big dataset -- The system may be I/O-bound. Adding RAM is a costly and brute force solution. However, some software techniques (eg, better indexes) may help, such as this for WordPress and WooCommerce.

Source https://stackoverflow.com/questions/67658920

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install ThreadPool

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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