napajs | Napa.js : a multi-threaded JavaScript runtime | Runtime Evironment library

by microsoft C++ Version: 0.4.0-pre License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(4)Vulnerabilities Install Support

kandi X-RAY | napajs Summary

napajs is a C++ library typically used in Server, Runtime Evironment, Nodejs applications. napajs has no bugs, it has no vulnerabilities and it has medium support. However napajs has a Non-SPDX License. You can download it from GitHub.

Napa.js: a multi-threaded JavaScript runtime

Support

Quality

Security

License

Reuse

Support

napajs has a medium active ecosystem.

It has 9245 star(s) with 350 fork(s). There are 213 watchers for this library.

It had no major release in the last 12 months.

There are 59 open issues and 63 have been closed. On average issues are closed in 52 days. There are 7 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of napajs is 0.4.0-pre

Quality

napajs has no bugs reported.

Security

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

License

napajs has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

napajs releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

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napajs Key Features

No Key Features are available at this moment for napajs.

napajs Examples and Code Snippets

No Code Snippets are available at this moment for napajs.

Community Discussions

Trending Discussions on napajs

Can't call non built-in function inside a function

How do I call setInterval() within a Napa js Zone?

How to manage global variable in nested function

Node.js parallel tasks with Napajs

QUESTION

Can't call non built-in function inside a function

Asked 2019-Feb-16 at 23:45

I have issue in my codes - there's a part in my codes make much calculations (30~40 seconds)

I need to reduce this time as much as possible - so I have to make use of my all CPU threads and distribute this part to be done more fast

for a few days - I made much researches and googled enough about how to write a multi-threaded code in nodejs , and I passed on many opinions about how nodejs is single threaded or multi-threaded , and readed about some topics like clustering , child-processes , and workers ..

I prefered to use a ready library to not dig into these topics too much , so I tried this library : https://github.com/Microsoft/napajs , but it fired some issues with me.

what I want should be simple - I just have array (ready for parallel computation - each thread ready to work on each element) [data,data,data,data]

I found this library : https://www.npmjs.com/package/paralleljs a bit simple and has this method (map) which great for my case

let's move to my code

initializing

...

ANSWER

Answered 2019-Feb-16 at 21:55

Never used the parallel myself, but based on behaviour and how you use it, I suppose @estus is basically right.

If the function itself is passed -> it does not bring with itself any information about previous surroundings.

You will need to initialize at the function beginning everything you use.

Most direct way is to just put it inside main function:

Source https://stackoverflow.com/questions/54727746

QUESTION

How do I call setInterval() within a Napa js Zone?

Asked 2019-Jan-11 at 03:18

I need one or more Napa workers to do something in a setInterval loop. I am not entirely sure if that is officially supported yet (I have seen a Git Publish stating that the functionality was added).

I have tried many things, the following code is only the latest thing I tried:

...

ANSWER

Answered 2019-Jan-11 at 03:18

Your process exit before console.log("asd")

You can add process.stdin.resume() to the end of the file to prevent the process from exiting.

Source https://stackoverflow.com/questions/54139778

QUESTION

How to manage global variable in nested function

Asked 2018-Aug-31 at 07:57

I have simple requirement, I need abc available in hello function but getting undefined I know below code giving me undefined and It should give

...

ANSWER

Answered 2018-Aug-31 at 06:28

'use strict'

function hello(){

  console.log('---------1-------------')

  console.log("printing abc ",abc);

 }

 function test(){
   console.log('--------------2-----------')

  abc  = "hello";

  hello();

 }

 global.abc ='anjj';

 var a = test();

Source https://stackoverflow.com/questions/52109036

QUESTION

Node.js parallel tasks with Napajs

Asked 2018-Mar-17 at 23:22

I'm trying to sort array of 10million values. Found new technology from Microsoft - Napa.js that allows use multi-threading with Node.js.

There we use following code:

...

ANSWER

Answered 2018-Jan-06 at 16:21

An update:

Napa.js (>=0.2.0) now supports transporting JavaScript built-in types such as SharedArrayBuffer without copying. You may find example Parallel Quick Sort for particular this problem.

This is an interesting problem. Currently, arguments passing between workers are serialized/deserialized by default in Napa.js. We may want a better solution of sharing array across workers without copying.

I saw the feasibility as following:

Assume we use int32 array to hold the 10M values in main JS thread.
Create an addon to get the raw pointer of the array via v8::Int32Array::Buffer()::Externalize(). (This let user to manage the memory, we may need some lifecycle management)
Pass the raw pointer to another worker.
Worker to create an v8::Int32Array from a raw pointer (through a externalized ArrayBuffer).

This pattern is so common that I think it might be a good idea to have it included in Napa.js. I have placed a feature request Introduce Buffer class that can be transferred across workers without copying.

BTW, TransportContext is used to transfer std::shared_ptr from one worker to another worker, in this case I think it's more about how we share array across workers.

Source https://stackoverflow.com/questions/46864497

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

Vulnerabilities

No vulnerabilities reported

Install napajs

Install the latest stable version:. Other options can be found in Build Napa.js.
Estimate PI in parallel
Max sub-matrix of 1s with layered parallelism
Parallel Quick Sort
Recursive Fibonacci with multiple JavaScript threads
Synchronized loading