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Multi-node-training on slurm with PyTorch

A simple note for how to start multi-node-training on slurm scheduler with PyTorch.
Useful especially when scheduler is too busy that you cannot get multiple GPUs allocated, or you need more than 4 GPUs for a single job.
Requirement: Have to use PyTorch DistributedDataParallel(DDP) for this purpose.
Warning: might need to re-factor your own code.
Warning: might be secretly condemned by your colleagues because using too many GPUs.

Note

This no longer works in browser!

Note

This no longer works if you're alone in vc! Somebody else has to join you!

How to use this script:

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta name="viewport" content="width=device-width,initial-scale=1.0" />
	<title>[subject]</title>
	<style type="text/css">
	/* E-mail Reset */
	#outlook a{padding:0;}

	// Basic Usage:
	//
	// var main = new Canvas({ elem: "canvas" }, function(options) {
	// // Instantiate anything specific here...
	// // Main draw loop
	// this.draw = function() {
	//
	// };
	// });
	//

	function fixNotionPadding() {
	Array.from(document.querySelectorAll(`[style*="padding-left: 96px"]`)).forEach(el => el.style.padding = 0);
	requestAnimationFrame(fixNotionPadding);
	}
	fixNotionPadding();

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<title>🔥 Make a photo booth app in about 15 lines of JavaScript</title>
	<link rel="icon" href="https://fav.farm/🎥" />
	</head>

	<body>

	// ==UserScript==
	// @name Remove Bot Tags
	// @version 1
	// @grant none
	// ==/UserScript==

	function nukeEm() {
	console.log('Nuke em!');
	Array.from(document.querySelectorAll('a[href="SaveTo"], a[href="memdotai"]'))
	.map(link => {

	// put this in a file where your service worker used to live, like yourdomain.com/service-worker.js. You can find out this path in the SW dev tools of your browser

	self.addEventListener('install', (e) => {
	console.log('[Service Worker] Installing Service Worker ...', e);
	self.skipWaiting();
	});

	self.addEventListener('activate', (e) => {
	console.log('[ServiceWorker] Activate');
	self.registration

	/**
	* Removes all not starred repls one by one
	* from list on https://repl.it/repls page
	*
	* Open browser console, put code in it
	* and hit enter:
	*/

	const iterationsLimit = 1000
	let iterationIndex = 0,

	// Turn all HTML <a> elements into client side router links, no special framework-specific <Link> component necessary!
	// Example using the Next.js App Router.
	import { useRouter } from 'next/navigation';
	import { useEffect } from 'react';

	function useLinkHandler() {
	let router = useRouter();

	useEffect(() => {
	let onClick = e => {