Load generators
A load generator is a tool that allows you to simulate the load on a service based on a given configuration. The testing tool in Load Testing uses the Pandora and Phantom load generators.
JMeter
JMeter is an open-source tool for web app testing. It can run tests with complex scenarios. It supports the following protocols:
- FTP
- HTTP
- IMAP
- JDBC
- JMS
- LDAP
- POP3
- SOAP
- TCP
Pandora
Pandora is the main load generator in Load Testing. Pandora is written in Go and can support more than 100,000 concurrent connections and generate a load of up to 90,000 simple requests per second. Pandora features built-in testing tools for the following protocols:
- gRPC
- HTTP/2
- HTTP(S)
You can use Pandora as a framework for developing custom versions. This allows you to generate a scenario-based load and to load most protocols that have client libraries written in Go (such as WebSocket, PostgreSQL, or DNS).
Phantom
A low-level generator for loading applications over HTTP and HTTPS. It can generate more than 100,000 requests per seconds and support more than 50,000 concurrent connections to a service. It uses vCPU and memory efficiently, but may require a large disk size. To generate the load, Phantom saves all the payloads to be sent to the service during load testing to the disk.