Performance Testing

 

Fundamental of Performance Testing

Agenda

Ø  Basics of Performance Testing?

Ø  Performance testing tool – LoadRunner Overview

Ø  Key Concepts – Transactions, Think Time, Correlation

Ø  Demo – Recording a Script

What is Performance Testing?

Ø  Ensures system stability, scalability and speed

Performance testing helps identify how systems behave under expected and peak load. Each type targets a specific concern.

Ø  Types of tests:

ü  Load

ü  Stress

ü  Spike

ü  Endurance

ü  Soak

Notes:  Under a load how an application is behaving and what is the response time?
How quick the end user is getting the web page and what is the throughput?
How many end users? Can able to access the application without any performance degradation without any issues? For end user two key performance aspects 1. One how quickly you are getting the page. 2.how many users (volume)

Test case to simulate the load, concurrent users doing the same functionality, how the application is behaving and how the application response.

Types:  Load:  Online application, 200 end users uploading the document in one hour. Create 200 users and upload the document, check the response time. My load, expected load.

Stress:  More load on the system, simulate with 300 or 400 end user.

Spike:  Ramp up the users in 5 minutes,

Endurance:  Run the test for long time.

Soak: Similar of load test

It comes under non-functional testing.

Response time, throughput and security is beyond the functional.

Performance Testing Lifecycle

Analysis and Planning -> Test Design->Test Execution->Result Analysis & Reporting

Ø  Analysis and Planning

ü  Requirement gathering

Ø  Test Design

ü  Scripting

ü  Scenario creation

Ø  Test Execution

Ø  Result Analysis

Performance Testing Process

Test Phases   Initiate->Estimate->Strategize->Design->Execute->Analyze->Final Report

Automation test using Loader tool.

Open-Source & Licensed Tools

Feature/Aspect	Open-Source Tools (Jmeter, k6, Gatling)	Licensed Tools(LoadRunner) (Self performer, VCS)
Cost	Free	Expensive (based on protocol, Vusers, etc.)
Protocol Support	Mostly HTTP, Web APIs	Extensive (SAP, Citrix, Siebel, Oracle, TruClient, etc.)
Ease of Use	Varies (some CLI, some GUI)	Full-featured GUI, user-friendly
Community Support	Large (for JMeter, k6)	Vendor Support (OpenText)
Customization	High(open code base)	Moderate (through APIs or custom scripting)
Scalability	Depends on scripting and infrastructure	Highly scalable with built-in controllers and load generators
Reporting	Good (especially Gatling, k6)	Advanced Analytics and built-in reporting
Monitoring	Needs integration(AppDynamics, InfluxDB, etc.)	Built-in monitoring and third-party integration
CI/CD Integration	Strong (JMeter, K6, Gatling)	Possible but needs ALM Integration

 

Load Runner

Load Runner is a suite of tools. VuGen is where scripts are built. Controller manages the scenario. Load Generators simulate users. Analysis gives insights into performance

Ø  VuGen: Script creation

Ø  Controller: Test Scenario creation

Ø  Load Generators: Vitrual users

Ø  Analysis: Post-run reports

Load runner is a threat based tool like Java. Load can run the test scripts parallel.

Controller can run the 100 users means 100 threads parallel.

Load generator to run those threads using virtual users.

Controller sets a timer and ends when user logs off. It gives you response time.

All the logs will be collected in the controller, the tool analysis tools gives the nice presentable format of logs.

One controller machines acts as a Master and the other controller machines are slaves.

At present, everyone is using the Performance Centre. PC is a web based application.

PC application is hosted in web server; it connects to controller and load generator.

Going forward, LRE is in cloud

Performance Centre

PC is an enterprise-grade, web-base performance testing platform from OpenText that enables centralized test execution, monitoring and analysis.

Ø  PC Host- Controller & Load generators

Ø  PC Server-Test Scheduling, Results analysis and User management

Ø  ALM Server – Script & file storage and Project tracking

Load Runner Enterprise (LRE) Cloud

LRE is a cloud-based performance testing platform by OpenText that enables teams to plan, run and manage large-scale load tests across distributed environments.

Key Concepts

Ø  Transaction: Measures response time between checkpoints

Ø  Think Time: Simulates user wait

Ø  Pacing: Time between iterations

Ø  Correlation: Handles dynamic values

Ø  Parameterization: Replaces hardcoded values

 

OpenText had given the framework

1.       Virtual User Generator (Install in your machine)

2.       Analysis (Install in your machine) (Install in your machine)

Agenda

Ø  Vugen Recording Traffic

Ø  Load Runner Test Execution Architecture

Ø  Performance Center ALM

Ø  Monitoring Agent