Nodejs Event Loop

Are there internally two event loops in nodejs architecture? libev/libuv v8 javascript event loop On an I/O request does node queue the request to libeio which in turn notifies the availability...

How can I compile a minimum program with libuv?

It's been quite a while since I wrote a program in C, and even so I always found the actual compiling and linking quite confusing. Since I've been playing / working with node.js lately, I have...

Async C UDP clients

I'm trying to create asynchronous high performance UDP client. I'm implementing UDP tracker protocol. Lets say I have 1000 torrent hashes. I need to make 1000/74 ~= 14 UDP requests, assuming that...

How to use libuv for direct file descriptor reads?

As part of an investigation for a project I am working on, I've been looking into different event loop mechanisms/libraries to use for detection and reading of data from sockets. Specifically,...

ASP.NET vNext on Linux Ubuntu 14.04. Unable to load Kestrel

I've installed mono 3.8.0, installed kvm and ran the kp=vm upgrade and My K runtime version is as follows Active Version Runtime Location Alias 1.0.0-beta3 ...

What is the different between JavaScript Event loop and Node.js Event loop?

In JavaScript, the event loop is used in the engine. Here is one diagram to illustrate it from this article. (source: mybalsamiq.com) For Node.js, the event loop also implemented here. Quoting...

Node.js event loop latency testing

I measure nodejs event loop using process.hrtime() also I count percentiles for measuring intervals. Here is my simple benchmark example I have run this test on PC with CPU i7-4770. This is how...

Libuv UDP basic send

When I try to send some basic UDP message it looks like it doesn't send it. I tried to run couple of examples that I found online. I am using SocketTest v3.0.0 for testing server/client. When I...

Nuget: NU1001 The dependency * could not be resolved. (Error: ...has timed out after 100000ms.)

I have cloned a repo from a friend and while I am doing Restore NugetPackages a lot of packages fails to get. In output I get a lot of records like: log : Retrying 'FindPackagesByIdAsync' for...

Is uv_write actually asynchronous?

According to tutorial for libuv, making subsequent calls to uv_write should not cause one write to block another write (my understanding was that they were supposed to occur on separate...

Relationship between event loop,libuv and v8 engine

I am learning through the architecture of Node.js. I have following questions. Is event loop a part of libuv or v8? Is event queue a part of event loop? are event queue generated by libuv or v8...

process.env.UV_THREADPOOL_SIZE not working?

I am trying to understand the threadpool in nodeJS. on running the code with creating process.env.UV_THREADPOOL_SIZE = 5; process.env.UV_THREADPOOL_SIZE = 5; const https =...

How to use libuv async handles in a thread-safe manner?

uv_async_send is thread-safe, but uv_async_init is not. If I use uv_async_init to create an async handle in the loop’s thread, I may call uv_async_send many times, but its callback will only be...

Docker - "Error: EACCES: permission denied, mkdir '/project/node_modules/.cache/@babel'"

Running yarn docker-build works fine but when yarn docker-up or yarn docker-dev an error pops up when RUN yarn is called. Nginx starts up fine but yarn fails into mkdir in the Projects...

Why is LIBUV needed in Node JS?

So, may be this question is too noob and novice to be asked but I still have no clue why LIBUV got a place in Node JS Architecture? So here is my understanding of NodeJs architecture. Node Js is...

How can i retrieve the address of the socket peer in Lisp with cl-async

I am experimenting with cl-async using SBCL, i cannot figure out how to retrieve the IP address of the socket that I'm communicating on. I'm using SBCL 1.4.16 on gnu-linux with telent 1.9.4 The...

comparing livuv, libevent or other implementations

We are currently using epoll based implementation on Linux. We plan to port our software to mac and hence looking for platform independent approach. I looked at libevent2 and libuv, both seem to...

How to fix Invalid API-key, IP, or permissions for action error?

This is Binance cryptoexchange api. Im trying to get account informations but I could not do that. It's official C++ Api. This is github link. This is error on terminal. When you answering the...

How does the libuv implementation of *non-blockingness* work exactly?

So I have just discovered that libuv is a fairly small library as far as C libraries go (compare to FFmpeg). I have spent the past 6 hours reading through the source code to get a feel for the...

NodeJS: Typescript compiler runs out of memory

I'm trying to run a node server on a free AWS EC 2 instance. Locally I can build and run my server, on AWS it keeps crashing, though. I run $ npm run build Error message: findus | <--- Last few...

how to fix the weird error "Operation not permitted"

[[email protected] tmp]$ ./sysupdate -bash: ./sysupdate: Operation not permitted [[email protected] tmp]$ chmod +x ./sysupdate [[email protected] tmp]$ ./sysupdate -bash: ./sysupdate: Operation not...

How to fix cloud firestore package not installing in flutter project?

Adding firebase cloud firestore to my project dependency packages crashes my apps. I first observed the problem when I was coding along with a youtube tutorial. Now even creating a new flutter...

How does a Node.js process behave in AWS Fargate?

I have a Node app deployed on AWS Fargate on the 1 vCPU/2GB memory task config. I have been wondering what's the behavior that Node.js has when running on this setup in relationship to the vCPUs...

WIn10 wsl2 :Ubuntu getting fatal: unable to access 'https: Failed to connect to github.com port 443: Connection timed out

no matter which HTTPS i try to connect in this example i try to clone GitHub repository I'm getting timeout error : git clone https://github.com/libuv/libuv.git Cloning into 'libuv'... fatal:...

pip install uvloop causes permission denied error

I try to install uvloop into a Python 3.9 venv on CentOS 7. These are all actions I take: cd ~ mkdir python_envs cd python_envs python -m venv test source test/bin/activate pip install --upgrade...

Error displaying Pyvis HTML inside Jupyter Lab cell

I'm using the Pyvis library to generate and display a network inside Jupyter Lab (in a cell) through the HTML format. I have managed to create the file and open it externally (with the Pyvis...

Conda - how to update only cudatoolkit in an existing environment?

This is a specific instance of a general problem that I run into when updating packages using conda. I have an environment that is working great on machine A. I want to transfer it to machine...

Updating packages in conda

I have a problem with updating packages in conda. The list of my installed packages is: # # Name Version Build Channel _anaconda_depends 2020.07 ...

What logical flow model is used for event loop in Nodejs (Google Chrome)

For a long time I thought that event loop implementation (libuv?) used in Chrome and Node.js used threads. But then I was reading this article on lightweight threads in Java that stated the...

Bokeh/panel won't render in-line with Jupyter Lab

I'm trying to visualize Bokeh plots and panels with a Bokeh backend in a notebook in JupyterLab. Things were running fine until I updated. Current packages and versions are below I have tried the...