Add ability to pass the concurrent id to the file under test

README.md

@@ -26,6 +26,7 @@ This will run the specified puppeteer script once in chrome headless instance.
 `--c` flag is to mention number of concurrent executions per sample
 `--silent` boolean to enable or disable logs
 `--outputFile` send performance results to output file
+`--addId` flag is to add a unique number as first argument to the puppeteer script
 
     $ puppeteer-loadtest --s=100 --c=25 --file=sample.js
 
@@ -39,6 +40,8 @@ This will run a total of 100 runs through the specified puppeteer script across
     $ puppeteer-loadtest --file=./test/sample.js  --s=100 --c=25
 
     $ puppeteer-loadtest --file=./test/sample.js  --s=100 --c=25 --silent=true
+
+	$ puppeteer-loadtest --file=./test/sample.js  --s=100 --c=25 --addId
 
     $ puppeteer-loadtest --file=./test/sample.js  -s 100 -c 25
 

bin.js

@@ -13,6 +13,7 @@ const file = argv.file;
 const samplesRequested = argv.s || 1;
 const concurrencyRequested = argv.c || 1;
 const silent = argv.silent || false;
+const addIdArgument = argv.addId || false;
 const outputFile = argv.outputFile;
 
 if (!file) {
@@ -39,8 +40,9 @@ const start = async () => {
     file,
     samplesRequested,
     concurrencyRequested,
+    addIdArgument
   });
-  
+
   if (results) {
     if (outputFile) {
       fs.writeFileSync(outputFile, JSON.stringify(results, null, "\t"));

index.js

@@ -11,6 +11,7 @@ const defaultOptions = {
   concurrencyRequested: 1,
   results: {},
   samplesCount: 0,
+  addIdArgument: false
 }
 
 debug('puppeteer-loadtest is loading...');
@@ -47,21 +48,22 @@ const executeTheCommand = function({ cmd, concurrencyCount, samplesCount, result
       if(error) reject(error);
       resolve(stdout);
     });
-  });   
+  });
 };
 
-const doAnotherSample = async (options) => { 
+const doAnotherSample = async (options) => {
   let {
     concurrencyRequested,
     file,
     samplesCount,
     samplesRequested,
     results,
+    addIdArgument
   } = options;
 
   if(samplesCount < samplesRequested) {
     startSampleLogPerformance(results, samplesCount);
-    await doConcurrency({ results,  samplesCount, concurrencyRequested, file });
+    await doConcurrency({ results,  samplesCount, concurrencyRequested, file, addIdArgument });
     stopSampleLogPerformance(results, samplesCount);
     samplesCount += 1;
     return doAnotherSample({
@@ -76,13 +78,13 @@ const doAnotherSample = async (options) => {
   return results;
 };
 
-const doConcurrency = async ({ results,  samplesCount, concurrencyRequested, file}) => {
+const doConcurrency = async ({ results,  samplesCount, concurrencyRequested, file, addIdArgument}) => {
   const promisesArray = [];
 
   for(let i=0; i < concurrencyRequested; i += 1) {
     promisesArray.push(
-      executeTheCommand({ 
-        cmd: `node ${file}`,
+      executeTheCommand({
+        cmd: addIdArgument ? `node ${file} ${i}` : `node ${file}`,
         concurrencyCount: i,
         results,
         samplesCount,