v8-perf | Exploring v8 performance characteristics in Node across v8 | Runtime Evironment library
kandi X-RAY | v8-perf Summary
kandi X-RAY | v8-perf Summary
Authors: David Mark Clements and Matteo Collina. Reviewers: Franziska Hinkelmann and Benedikt Meurer from the V8 team. Since it's inception Node.js has depended on the V8 JavaScript engine to provide code execution in the language we all know and love. The V8 JavaScript engine is a JavaScript VM written by Google for the Chrome browser. From the beginning, a primary goal of V8 was to make JavaScript fast, or at least - faster than the competition. For a highly dynamic, loosely typed language this is no easy feat. This piece is about the evolution of V8 and JS engines performance. A central piece of the V8 engine that allows it to execute JavaScript at high speed is the JIT (Just In Time) compiler. This is a dynamic compiler that can optimize code during runtime. When V8 was first built the JIT Compiler was dubbed FullCodegen. Then, the V8 team implemented Crankshaft, which included many performance optimizations that FullCodegen did not implement. As an outside observer and user of JavaScript since the 90's, it has seemed that fast and slow paths in JavaScript (whatever the engine may be) were often counter-intuitive, the reasons for apparently slow JavaScript code were often difficult to fathom. In recent years Matteo Collina and I have focused on finding out how to write performant Node.js code. Of course this means knowing which approaches are fast and which approaches are slow when our code is executed by the V8 JavaScript engine. Now it's time for us to challenge all our assumptions about performance, because the V8 team has has written a new JIT Compiler: Turbofan. Starting with the more commonly known "V8 Killers" (pieces of code which cause optimization bail-out - a term that no longer makes sense in a Turbofan context) and moving towards the more obscure discoveries Matteo and I have made around Crankshaft performance, we're going to walk through a series of microbenchmark results and observations over progressing versions of V8. Of course, before optimizing for V8 logic paths, we should first focus on API design, algorithms and data structures. These microbenchmarks are meant as indicators of how JavaScript execution in Node is changing. We can use these indicators to influence our general code style and the ways we improve performance after we've applied the usual optimizations. We'll be looking at the performance of these microbenchmarks on V8 versions 5.1, 5.8, 5.9, 6.0 and 6.1. To put each of these versions into context: V8 5.1 is the engine used by Node 6 and uses the Crankshaft JIT Compiler, V8 5.8 is used in Node 8.0 to 8.2 and uses a mixture of Crankshaft and Turbofan. Currently 6.0 engine is due to be in Node 8.3 and V8 version 6.1 is the latest version of V8 (at the time of writing) which is integrated with Node on the experimental node-v8 repo at In other words, V8 version 6.1 will eventually be in some future version of Node, likely Node.js 9. Let's take a look at our microbenchmarks and on the other side we'll talk about what this means for the future. All the microbenchmarks are executed using benchmark.js, and the values plotted are operation per second, so higher is better in every diagram.
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QUESTION
When i set my username and password directly in a nodemailer server, it works as expected
...ANSWER
Answered 2021-Dec-31 at 07:29The syntax in your .env file is incorrect. Use equals = signs rather than colon :.
QUESTION
I am a windows user. I installed Windows Subsystem for Linux [wsl2] and then installed docker using it. Then I tried to get started with OpenSearch so I followed the documentation in the given link https://opensearch.org/downloads.html and run docker-compose up, In the shell, I am getting an error message like
opensearch-dashboards | {"type":"log","@timestamp":"2022-01-18T16:31:18Z","tags":["error","opensearch","data"],"pid":1,"message":"[ConnectionError]: getaddrinfo EAI_AGAIN opensearch-node1 opensearch-node1:9200"}
In the port http://localhost:5601/ I am getting messages like
OpenSearch Dashboards server is not ready yet
I also changed resources preference for memory to 5GB in docker-desktop but it still doesn't work. Can somebody help me with this?
...ANSWER
Answered 2022-Feb-13 at 22:00I had the same error message when opening "http://localhost:5601/" while testing opensearch and opensearch dasboard locally using Docker in Windows 10:
- OpenSearch Dashboards server is not ready yet
- opensearch-dashboards | {"type":"log","@timestamp":"2022-02-10T12:29:35Z","tags":["error","opensearch","data"],"pid":1,"message":"[ConnectionError]: getaddrinfo EAI_AGAIN opensearch-node1 opensearch-node1:9200"}
But when looking into the log I also found this other error:
- opensearch-node1 | [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
The 3 part solution working for me was:
Part 1
On each opensearch nodes update the file:
QUESTION
I'm at school and in on Campus housing which means I don't have access to the router to get the admin password to allow me to port-forward my website for my senior Capstone. I would like to know how to host a server that I can insert a MySql database, as well as my sight files from my own machine; how would I even go about getting around this without port forwarding?
There is an "Open Windows Firewall Ports for network access" embedded within MySQL Server download prosses theoretically if clicked would it allow me to embed a Website within MySQL Server and host it?? or would that just allow my database to be assessable threw my vulnerable network.
...ANSWER
Answered 2022-Jan-27 at 22:57One solution would be to use reverse proxy services like https://pagekite.net/
QUESTION
I am working on an Online E-Learning website with Laravel 5.8 and I need to run a query for updating exam results of users that have been participated in the exam.
Here is the Controller method for updating exam scores:
...ANSWER
Answered 2022-Jan-21 at 09:59There is a chunk method in laravel for queuing large data. You can chunk the data and try importing datas Here is the link for reference: here
I hope this link will help you. Here is what documentation says about it.
If you need to work with thousands of database records, consider using the chunk method provided by the DB facade. This method retrieves a small chunk of results at a time and feeds each chunk into a closure for processing. For example, let's retrieve the entire users table in chunks of 100 records at a time:
QUESTION
I am developing an app to learn serverside. I have created a node js server and an android app.
WorkFlow⚙️(What I want to achieve):-
My local IP of pc: 192.168.0.120
On the port I am listening:8443
The whole thing working fine in localhost: as I am sending POST req. on 192.168.0.120:8443 on clicking the button on my app.
But this will only work if I am connected to my wifi not when connected to the SIM network or somewhere remote location.
So my question is where to send a request by clicking the button in my app (definitely can't send on 192.168.0.120:8443 as I am won't be connected to wifi)?
server.js file
...ANSWER
Answered 2022-Jan-14 at 08:27This is more of a networking question than a node question. You'll have to be able to configure your gateway router / firewall to make it work. In addition, your ISP must permit inbound connections on the ports your listening to. Fortunately, this likely isn't going to be an issue, but just something to be aware of.
First, you'll need to configure your router to do port forwarding. Port forwarding will translate connections to a specific port on your router and then forward that request to the same port on a specific internal IP address on your local network. If your router has a firewall, you may also have to create a rule to let traffic on that port through. Most home routers won't need to do this.
Once your gateway router is set up, you'll need to find out the external IP address of your router. To find the external IP address you can go to a website such as https://whatismyipaddress.com/. Give this IP address along with the port to whoever you want to connect to your server.
Most ISPs assign IP addresses dynamically, so you'll have to check to see if your IP address has changed from time to time.
Once this is all set up and ports are forwarded to your local dev machine, you can launch your Node server and start seeing requests.
Be aware there are some risks with exposing your machine to the internet. Just be sure that you don't trust input to your server and maybe turn off port forwarding when you don't need it.
If you're not able to do any router configuration, look into ngrok. This will get though almost any NAT router or firewall. Be aware that the free version is limited to 40 connections per minute.
QUESTION
I want to call the index.html from the folder /var/www/fileUpload/html. The index.html file exists in that folder.
The / router works. the uploadFiles route as well. But when I open the upload route I get a 404 error.
...ANSWER
Answered 2022-Jan-12 at 09:01That should be alias /var/www/fileUpload/html; otherwise Nginx is looking for the file in /var/www/fileUpload/html/upload/index.html. See this document for details.
For example:
QUESTION
I am trying to send an HTTP request using Vapor, to verify a recaptcha
Google's Captcha api is defined as follows:
URL: https://www.google.com/recaptcha/api/siteverify METHOD: POST
POST Parameter Description secret Required. The shared key between your site and reCAPTCHA. response Required. The user response token provided by the reCAPTCHA client-side integration on your site. remoteip Optional. The user's IP address.So I need to make a POST request with 2 parameters (secret and response).
In Swift i have:
...ANSWER
Answered 2022-Jan-07 at 10:22As Nick stated: the problem was that instead of .formData, I needed to use .urlEncodedForm.
QUESTION
Basically i have a bot in my django webapp when given your social media credentials it manages your one of social media accounts i was able to succesfully run it while the client is still on website and as you would expect it stopped when the client closed the website. Is there any way to store the credentials and then keep the bot running even after user leaves website and so that bot still manages the account? The bot is mostly making few requests and API calls. Thank You
...ANSWER
Answered 2021-Dec-24 at 18:19Lots of options.
- Celery. A library for organizing a task queue. Production-ready, widely supported, has a great community.
- Dramatiq possibly with periodic.
Dramatiqis also a library for organizing a task queue,periodicis a task scheduler. Less popular, more lightweight, and quite stable. Entry threshold is lesser thancelery, as for me. - Supervisor. Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems. One command to install, very easy to configure, quite suitable for small projects (it's harder to use it when the amount of background routines becomes 10+).
- Tmux. It is a terminal multiplexer with the possibility to remain a process running after disconnection of it. Could be useful when you're running something one time or for tests.
- Django Background Task. It is a databased-backed work queue for Django, loosely based around Ruby’s DelayedJob library. Unmaintained and incompatible with Django versions newer than 2.2.
QUESTION
I have one of the following API URLs. At the end of the day for my use case, it doesn't matter which of these URLs I would have to use, but currently neither work.
...ANSWER
Answered 2021-Nov-22 at 17:29import * as url from "url";
const params = url.parse(req.url as string, true).query;
const {id} = params
QUESTION
I have a system that has a fastAPI server, a python client implemented on Raspberry and Javascript clients for the user interface. Data is sent from python client to server then forwarded to Js client and vice versa. I established the connection between the server and each type of client but when sending from a client-side to the server, it just send back to that client and the rest ones receive nothing. What is the proper way to deal with this problem? Hope for your help. Thanks.
...ANSWER
Answered 2021-Dec-20 at 01:50The problem with websocket is it doesn't support broadcasting. You can store somewhere list of connected clients and iterate over them to send a message
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