How to fix “All Launchers Terminated” errors when running concurrent test sessions on a local machine
Condition
You may see the error “All launchers terminated” when trying to run multiple concurrent test sessions on your local machine.
Cause
There are two main reasons for this error:
-
Insufficient RAM capacity
- Running multiple sessions requires more memory.
- As a rule of thumb, each concurrent session needs 2 GB of RAM.
- For example: 3 sessions → 6 GB RAM required (3 × 2 GB). See Katalon’s system requirements guide for details.
-
Unsupported practice
- Running multiple tests in the same project location is not supported by Katalon and may cause failures.
Solution
To avoid this error, try the following approaches:
Option 1: Upgrade local resources
Make sure your machine has enough RAM to handle the number of concurrent sessions you want to run.
Option 2: Use Jenkins for concurrent executions
Instead of running concurrent tests locally, use Jenkins as a CI/CD tool.
Jenkins will:
- Check out your project repositories into separate workspaces.
- Allow you to run multiple test projects in parallel, each in its own location.
This avoids conflicts and improves stability. Refer to these guides for setup: Use Jenkins with Katalon Studio