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Add documentation about the CRANELIFT_FILETESTS_THREADS environment variable

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Nick Fitzgerald
2020-05-01 09:15:46 -07:00
parent c4292fb2be
commit c0503455be
1 changed files with 9 additions and 0 deletions
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cranelift/docs/testing.md
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@@ -74,6 +74,15 @@ run will also have the RISC-V specific flag `supports_m` disabled.
The filetests are run automatically as part of `cargo test`, and they can The filetests are run automatically as part of `cargo test`, and they can
also be run manually with the `clif-util test` command. also be run manually with the `clif-util test` command.
By default, the test runner will spawn a thread pool with as many threads as
there are logical CPUs. You can explicitly control how many threads are spawned
via the `CRANELIFT_FILETESTS_THREADS` environment variable. For example, to
limit the test runner to a single thread, use:
```
$ CRANELIFT_FILETESTS_THREADS=1 clif-util test path/to/file.clif
```
### Filecheck ### Filecheck
Many of the test commands described below use *filecheck* to verify their Many of the test commands described below use *filecheck* to verify their