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add warning about default test order causing problems with MPI #3192

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4 changes: 4 additions & 0 deletions docs/command-line.md
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Expand Up @@ -457,6 +457,10 @@ Using `random-device` asks for `std::random_device` to be used instead.
If your implementation provides working `std::random_device`, it should
be preferred to using `time`. Catch2 uses `std::random_device` by default.

> [!WARNING]
> You should not use this option when launching Catch2 tests on multiples processes that require synchronous communication,
> (e.g., Message Passing Interface (MPI) code),
> because the test order of execution will **not** be indentical on all processes.

<a id="libidentify"></a>
## Identify framework and version according to the libIdentify standard
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