replaced process usage with puppeteer usage

load_index.js

-const puppeteer = require('puppeteer');
 var args = require("yargs")
-    .usage("Usage : load_index.js -saveAs metadata/attachment -file file_path")
-    .demandOption(['file'])
-    .demandOption(['saveAs'])
-    .alias("f", "file")
-    .alias("s", "saveAs")
-    .describe("file", "file containing content to put in the index, data must follow the CSV standard")
-    .describe("saveAs", "choose whether to save the index as metadata or attachments in the indexeddb")
-    .nargs("file", 1)
-    .nargs("saveAs", 1)
-    .argv;
+.usage("Usage : load_index.js -saveAs metadata/attachment -file file_path")
+.demandOption(['file'])
+.demandOption(['saveAs'])
+.alias("f", "file")
+.alias("s", "saveAs")
+.describe("file", "file containing content to put in the index, data must follow the CSV standard")
+.describe("saveAs", "choose whether to save the index as metadata or attachments in the indexeddb")
+.nargs("file", 1)
+.nargs("saveAs", 1)
+.argv;
 
 if (!(args.saveAs === "metadata" ||args.saveAs === "attachment")){
   throw 'Unrecognized save as argument';
 }
 var saveAs = args.saveAs;
 
-var browser;
+const puppeteer = require('puppeteer');
+var browser, page;
+
+const si = require("systeminformation");
 
 var Server = require('ws').Server;
 var port = 9030;
 var ws = new Server({port: port});
-    ws.on('connection', function(w){
-    w.on('message', function(msg){
-      console.log(msg);
-      const used = process.memoryUsage();
-      for (let key in used) {
-        console.log(`${key} ${Math.round(used[key] / 1024 / 1024 * 100) / 100} MB`);
-      }
+ws.on('connection', function(w){
+  w.on('message', function(msg){
+    console.log(msg);
+    page.metrics()
+      .then(function(values){
+      console.log(values.JSHeapUsedSize / 1024 / 1024);
+      si.mem(function(data){
+        console.log(data.used / 1024 / 1024);
+      });
       browser.close();
-    });
-    w.on('close', function() {
-      ws.close();
-    });
+      });
+  });
+  w.on('close', function() {
+    ws.close();
+  });
 });
 
 (async () => {
-  const used = process.memoryUsage();
-  for (let key in used) {
-    console.log(`${key} ${Math.round(used[key] / 1024 / 1024 * 100) / 100} MB`);
-  }
   browser = await puppeteer.launch();
-  const page = await browser.newPage();
+  page = await browser.newPage();
+  var metrics = await page.metrics();
+  console.log(metrics.JSHeapUsedSize / 1024 / 1024);
+  si.mem(function(data){
+    console.log(data.used / 1024 / 1024);
+  });
   await page.goto('https://softinst115787.host.vifib.net/public/unit_tests/index_load.html?saveAs='+saveAs);
   const [fileChooser] = await Promise.all([
     page.waitForFileChooser(),