The Best Performance Testing Tools Open-Source is an e-book specifically designed for software testing professionals. This book gives valuable insights, ideas, and valuable information on what testing tools are available to the software community. Among these numerous valuable test cases that this book features, automation using performance testing tools is one of the most valuable ones.
This is best performance testing tools open source. We are trying to achieve this without any external dependencies. It provides an elegant way of constructing TestNG test suites through its fluent API. It reads TestNG XML files and builds the test suite according to the specifications. It provides many convenient methods for setting up your test suite.
StresStimulus
This is a popular performance testing tool. This is because; it can handle situations that may be complex to test utilizing other tools. It performs by fixing playback mistakes automatically incorporating its different autocorrelation features. The tool saves user actions before replaying them to follow changing usage patterns. It keeps a record of load impact on software responsiveness of the server infrastructure and the software. It can pinpoint hidden concurrency mistakes and offers detailed performance metrics. The main features are:
· On-premise or cloud testing utilizing various load generators
· Complete test wizard decreases the learning curve by entailing all steps
· Availability of alternative manual scripting and the tool support up to three languages.
· Permits script to transfer visual studio test format
· Can be utilized as an independent or a fiddler add on tool
SmartMeter.io
It is one of the most liked tools for performance testing among the testers. These testers want to counter the disadvantages related to JMeter. The tool backs the development of an easy scriptless test environment with its recorder. It offers test reports and contains features like comparison analysis, test runs trend, automatic test criteria assessment. The tool provides complete support for CI/CD integration. The main features are:
· Develops a scriptless test environment
· Innovative reaction body extractor
· Immediate outcomes and GUI test runs
· Complete reporting, spontaneous assessment, and test execution associations
· Ropes CI/CD integration
SmartMeter.io follows various protocols- SOAP, JMS, JDBC, LDAP, FTP, and HTTP. There is no requirement for proxy setup or browser plugins. It has good capabilities in CI integration and distributed testing. It also offers supreme performance testing support when there is a requirement for app validation.
Apache JMeter
Apache JMeter is a very famous open source performance testing tool that is developed especially for performance and load testing. it can be utilized to measure and analyze the performance of wide-ranging software, covering services encompassing servers and networks. It is largely utilized as a website load testing tool for various sorts of web service apps.
JMeter is a Java platform app that can be assimilated with the test frameworks. It also permits you to develop a functional test plan with a load test plan. Some main features are:
· Ropes various load injectors that are managed to utilize one controller
· Do not need the latest infrastructure for load testing
· Needs minimum scripting efforts in comparison to other API performance testing tools. This is because it has a user-friendly interface.
· Ropes all Java-based apps
· A simple analysis of key load based resource and stats consumption monitors by showing simple charts and graphs
The basic protocols supported by this performance test tool are: FTP, SOAP, Java-based protocols, XML, HTTP, and HTTPS
Silk Performer
Silk Performer is an enterprise class stress and load testing tool. It is capable of testing application environments along with hundreds and thousands concurrent users. It comes with CloudBurst feature that enables QA teams to efficiently launch any kind of peak load performance test without worrying about complex infrastructure. You can execute tests from over 50 locations globally. It supports Google, AWS, Azure.
Here are the key features of Silk Performer:
- Components -> Workbench, Performance Explorer, and True Log Explorer
- Minimal hardware is required for virtual user simulation
- Simulates modifiable virtual users
- It supports integrated server monitoring
- Supports six models of workloads
- Stress test website with server side diagnostics
Silk Performer supports the following protocols: HTTP/HTML, HTTPS/HTML, HTTP/HTTPS, Flash, Email (SMTP/ POP), FTP, TCP/IP, LDAP, XML/SOAP, .NET and many more.
Gatling
Gatling is a relatively new open-source load testing tool that was created in 2012. It enables you to execute load simulation of concurrent users against the system via JMS, HTTP/S, or JDBC protocols. You can use this tool to simulate web users of a system to identify bottlenecks and optimize them.
It is compatible for all operating systems as it works on Java. Gatling has two executables: one is to record tests and the other one is used to execute them. All the tests are recorded in Scala. After the execution is completed, an immersive and graphical report of the test is generated.
Here are the key features of Gatling:
- It supports any operating system or browser
- Scripting language is Scala and has its own DSL
- Can execute tests in multiple test clouds
- Capable of scaling through Taurus with BlazeMeter or flood.io
Gatling supports the following protocols: HTTP/S, JMS, and JDBC.
Taurus 
While not technically a load testing tool Taurus acts more like a wrapper on top of other solutions that hides the complexity of running performance tests.
The power of Taurus is that it allows you to write your tests in YAML.
You can actually describe a full-blown script in about ten lines of text, which gives teams the ability to describe their tests in a YAML or JSON file. The YAML is a human, readable, edible approach that enables you to describe a test in a simple text file.
This is a big leap forward from the old days of having to bring up a big, heavy vendor-specific record and scripting tool for load time measuring.
Features
- This should also allow more members of your team to contribute to performance tests. Also, since your test cases are written in YAML the tests are much more readable, making them easier to perform code reviews on.
- Taurus basically fits performance testing into your CI/CD pipeline much more efficiently.
- Taurus provides a sort of abstraction layer on top of JMeter, as well as some other tools like Locust, Gatling, the Grinder and Selenium.
It currently has 1.4k stars on GitHub.
Locust 
Locust is a simple-to-use, distributed, user load testing tool that can help you capture response times.
What scripting languages does it use? The best one — Python! 🙂
It is used to helps performance test websites or other applications.
Locust can also help you figure out how many concurrent users a system can handle.
Where tools like jMeter are based upon, a thread-based architecture that consumes a lot of resources. Locust uses an event-based approach that uses fewer resources.
Rahul Solanki a technical leader at BlueConch Technologies mentioned to me that when he compared it with JMeter, the number of resources that Locust occupies was around 70 percent less.
If you’re familiar with the term “load generators,” Locust uses the term “swarm”–as in you can point a swarm of locusts to put a load on your website.
You can define the behavior you want for each of your Locust instances. It also gives you the ability to monitor the swarming process from a web UI in real-time.
Some of the cool key features you get with Locust are:
- The ability to create your test scenarios using straight Python
- You can easily scale the number of users you need to emulate
- It has a nice Web-based UI
- Extensible
- Good for testing APIs
Cons
Since its a newer tool it has far fewer plugins than JMeter
It currently has 15.7k stars on GitHub.
Conclusion
Performance testing tools are widely used in software development. With this product you will have on hand a collection of Open Source performance testing tools that will be the best ones on the market. Although there are multiple available, they are hard to compare because they have different features. Therefore you need to compare them first on the aspects important to you.