README.md

Linux watcher

Get the peak memory usage in the duration

How to install

// instal node 17
bash <(curl -sL https://gist.githubusercontent.com/grieve54706/81e7c6c69b34d92f383ea151b6f28a94/raw/e7edfb4d2ea514142ca045301e090270c3637457/upgrade-node.sh)

// reload env var
source ~/.bashrc

// run tool
npx https://gist.github.com/grieve54706/81e7c6c69b34d92f383ea151b6f28a94

// remove npx cache if need to use new version
cd ~/.npm/_npx/ && rm -rf *

How to use

TBD

main.js

#!/usr/bin/env node

import figlet from 'figlet';
import gradient from 'gradient-string';
import { confirm } from '@inquirer/prompts';
import shell from 'shelljs';
import schedule from 'node-schedule';
import chalk from 'chalk';

async function main() {

    var banner = figlet.textSync('Linux Watcher');
    console.log(gradient.mind.multiline(banner));

    console.log('Welcome to use Linux Watcher')

    let peakMemory = 0;
    let job;

    const wantToStart = await confirm({ message: 'Do you want to ' + chalk.green('START') + ' to watch memory usages of system?', default: true });
    if (wantToStart) {
        job = schedule.scheduleJob('0/1 * * * * ?', () => {
            const { stdout } = shell.exec('cat /sys/fs/cgroup/memory/memory.usage_in_bytes', { silent: true })
            const memory_usage = Number(stdout.trim());
            if (memory_usage > peakMemory) {
                peakMemory = memory_usage;
            }
        })
    }
    else {
        return;
    }

    console.log('NOW, you can start your process to watch the peak memory usage of system, If your process is done, you can stop watcher to look at the results.');

    const wantToLook = await confirm({ message: 'Do you want to ' + chalk.red('STOP') + ' watcher to look at the results?', default: true });
    if (wantToLook) {
        console.log('Peak of memory usage of system is: ' + bytesToMB(peakMemory));
    }
    
    job.cancel();
}

function bytesToMB(bytes) {
    return `${parseFloat(bytes / (1024 ** 3)).toFixed(2)}Gi`
}

await main();

package.json

{
  "name": "Linux-Watcher",
  "version": "1.0.0",
  "description": "",
  "main": "main.js",
  "bin": "./main.js",
  "type": "module",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Grieve",
  "license": "ISC",
  "dependencies": {
    "@inquirer/prompts": "^3.0.0",
    "chalk": "^5.3.0",
    "figlet": "^1.6.0",
    "gradient-string": "^2.0.2",
    "node-schedule": "^2.1.1",
    "shelljs": "^0.8.5"
  }
}

upgrade-node.sh

#!/bin/bash

sudo apt-get remove nodejs
sudo apt-get remove npm
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.2/install.sh | bash
chmod +x ~/.nvm/nvm.sh
source ~/.bashrc 
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
nvm install 17
node -v
npm -v