rust/library/test/src/bench.rs, branch try

Reformat using the new identifier sorting from rustfmt

2024-09-22T23:11:29+00:00

Reformat `use` declarations.

2024-07-28T22:26:52+00:00

The previous commit updated `rustfmt.toml` appropriately. This commit is the outcome of running `x fmt --all` with the new formatting options.

Add blank lines after module-level `//!` comments.

2024-06-19T23:23:20+00:00

Most modules have such a blank line, but some don't. Inserting the blank line makes it clearer that the `//!` comments are describing the entire module, rather than the `use` declaration(s) that immediately follows.

Run rustfmt on files that need it.

2024-05-24T05:17:21+00:00

Somehow these files aren't properly formatted. By default `x fmt` and `x tidy` only check files that have changed against master, so if an ill-formatted file somehow slips in it can stay that way as long as it doesn't get modified(?) I found these when I ran `x fmt` explicitly on every `.rs` file in the repo, while working on https://github.com/rust-lang/compiler-team/issues/750.

print walltime benchmarks with subnanosecond precision

2024-05-05T22:25:00+00:00

example results when benchmarking 1-4 serialized ADD instructions ``` running 4 tests test add ... bench: 0.24 ns/iter (+/- 0.00) test add2 ... bench: 0.48 ns/iter (+/- 0.01) test add3 ... bench: 0.72 ns/iter (+/- 0.01) test add4 ... bench: 0.96 ns/iter (+/- 0.01) ```

Do not panic when a test function returns Result::Err.

2022-09-16T14:36:00+00:00

Rust's test library allows test functions to return a Result, so that the test is deemed to have failed if the function returns a Result::Err variant. Currently, this works by having Result implement the Termination trait and asserting in assert_test_result that Termination::report() indicates successful completion. This turns a Result::Err into a panic, which is caught and unwound in the test library. This approach is problematic in certain environments where one wishes to save on both binary size and compute resources when running tests by: * Compiling all code with --panic=abort to avoid having to generate unwinding tables, and * Running most tests in-process to avoid the overhead of spawning new processes. This change removes the intermediate panic step and passes a Result::Err directly through to the test runner. To do this, it modifies assert_test_result to return a Result<(), String> where the Err variant holds what was previously the panic message. It changes the types in the TestFn enum to return Result<(), String>. This tries to minimise the changes to benchmark tests, so it calls unwrap() on the Result returned by assert_test_result, effectively keeping the same behaviour as before.

move core::hint::black_box under its own feature gate

2021-04-25T09:08:12+00:00

libtest: Index tests by a unique TestId

2021-03-25T06:08:13+00:00

This more robustly avoids problems with duplicate TestDesc. See #81852 and #82274. Signed-off-by: Anders Kaseorg

Merge set_panic and set_print into set_output_capture.

2020-11-10T20:58:13+00:00

There were no use cases for setting them separately. Merging them simplifies some things.

Remove io::LocalOutput and use Arc> for local streams.

2020-11-10T20:57:05+00:00