* Rewrite complexity_test to use (hardcoded) manual time
This test is fundamentally flaky, because it tried to read tea leafs,
and is inherently misbehaving in CI environments,
since there are unmitigated sources of noise.
That being said, the computed Big-O also depends on the `--benchmark_min_time=`
Fixes https://github.com/google/benchmark/issues/272
* Correctly compute Big-O for manual timings. Fixes#1758.
* complexity_test: do more stuff in empty loop
* Make all empty loops be a bit longer empty
Looks like on windows, some of these tests still fail,
i guess clock precision is too small.
Defines a wrapper function, CheckNumCPUs, which enforces that GetNumCPUs
never returns fewer than one CPU. There is no reasonable way to
continue if we are unable to identify the number of CPUs.
Signed-off-by: Sam James <sam@gentoo.org>
* Add support for Alpha architecture
As documented, the real cycle counter is unsafe to use here, because it
is a 32-bit integer which wraps every ~4s. Use gettimeofday instead,
which has a limitation of a low-precision real-time-clock (~1ms), but no
wrapping. Passes test suite.
Support parsing /proc/cpuinfo on Alpha
tabular_test: add a missing DoNotOptimize call
Test coverage isn't great, but not worse than the existing one.
You'd think `BENCHMARK_CAPTURE` would suffice,
but you can't pass `func<targs>` to it (due to the `<` and `>`),
and when passing `(func<targs>)` we get issues with brackets.
So i'm not sure if we can fully avoid this helper.
That being said, if there is only a single template argument,
`BENCHMARK_CAPTURE()` works fine if we avoid using function name.
* CMake: `get_git_version()`: just use `--dirty` flag of `git describe`
* CMake: move version normalization out of `get_git_version()`
Mainly, i want `get_git_version()` to return true version,
not something sanitized.
* JSON reporter: store library version and schema version in `context`
* Tools: discard inputs with unexpected `json_schema_version`
* Extract version string into `GetBenchmarkVersiom()`
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Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
Also fix a mypy error in `tools.gbench.util` - the condition behaves the
same as before, but in the new mypy version, the old condition results
in an unreachable code error for the final `return False` statement.
This is most likely a bug in mypy's reachability analysis, but the fix
is easy enough here to circumvent it.
* tools/compare: when dumping json, pretty-print it
It's rather completely non-human-readable otherwise.
I can't imagine the filesize really matters,
and if it does, it should just be compressed later on.
* tools/compare: add failing test
* tools/compare: don't actually discard valid (but zero) `pvalue`
So, this is embarressing. For a very large number of repetitions,
we can end up with pvalue of a true zero, and it obviously compares false,
and we treat it as-if we failed to compute it...
* Instead of directly comparing std::cout and GetOutputStream(), the underlying buffers are retreived via rdbuf(), and then compared.
* Instead of fflush(stdout), call out.flush().
Use out << FormatString() instead of vprintf
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Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
Follow up of #1725.
`defines` propagates to reverse dependencies, while `local_defines`
don't. If we use `defines` then there's risk of ODR violation:
Suppose a user have a cc_library foo that depends on bar and benchmark:
cc_library(name = "foo", deps = [":bar", "@com_github_google_benchmark//:benchmark"])
And bar has a class that has LFS-dependant ABI:
cc_library(name = "foo")
class Bar {
off_t member;
};
Bar would be compiled without LFS, but linked to foo when assuming LFS is enabled.
So we limit LFS to within the library only. benchmark does not have
LFS dependant public ABIs so it should be fine.
* Enable Large-file Support
This should fix https://github.com/google/benchmark/issues/1725
* Use whitespaces instead of tab in BUILD.bazel
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Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
Starting with Linux 6.6 [1], RDCYCLE is a privileged instruction on
RISC-V and can't be used directly from userland. There is a sysctl
option to change that as a transition period, but it will eventually
disappear.
Use RDTIME instead, which while less accurate has the advantage of being
synchronized between CPU (and thus monotonic) and of constant frequency.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc4c07c89aada16229084eeb93895c95b7eabaa3
Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
The reason for this is that `setuptools-scm` installs a version relative
to the last release tag - if no tag is found, the default version is taken
to be v0.1.0. This was the case in GitHub Actions, where only the PR
branch is checked out.
Also unpins build system requirements in the `pyproject.toml`.
The sdist build system was changed to `build` from `python setup.py sdist`
for forward compatibility - `build` is superior in every way, and the
advertised solution by both cibuildwheel and PyPA itself.
Bump `actions/setup-python` to v5, `pypa/gh-action-pypi-publish` to v1.8.11,
and `docker/setup-qemu-action` to v3.
* Run `pre-commit autoupdate`, fix stale pyproject.toml comments
* Set `--enable_bzlmod=false` for the moment
Until the newer nanobind tags are pushed to the BCR, it's best to disable
bzlmod for the bindings, because the Python CI breaks due to Bazel 7
enabling bzlmod by default.
* Remove E203 ignore, add linebreaks to semantically group ruff options
Bumps `rules_foreign_cc` to v0.10.1 (October 2023), `bazel_skylib` to
v1.5.0 (November 2023), `rules_python` to v0.27.1 (December 2023).
Also syncs GoogleTest to v1.12.1 (the last C++11 supporting version) to
be the same as in MODULE.bazel.
Since the latest `rules_python` changed its setup calling convention,
that is updated also in the WORKSPACE file.
This method was the culprit for the recent editable install breakage,
since it just tries to copy the generated extension file without checking
its existence.
Since the `BazelExtension` uses a non-standard location to store the
build artifacts, calling the copy method fails the build since the
extension is not found in the expected location.
But, since we already copy the file into the source tree as part of the
`BazelExtension.bazel_build` method, it's fine - the extension appears
in the right place, and the egg info is generated correctly as well.
This method also does not affect the general install, so it solves the
editable problem without regressing the fixed install.
Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
There is no bug here, but it gave me a scare the other day.
It is not incorrect to use `IterationCount` here,
since it's just an `int64_t` either way,
but it's wildly confusing. Let's not do that.
Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
For some reason, editable pip installs are now broken, which means that
they will break the pre-commit workflow due to the `pip install -e .`
instruction.
Since the normal install is unaffected, we can just drop the `-e` switch.
It does not matter which mode is used, since the environment is only
used for linting.
Saves one pre-commit hook, some pyproject.toml configuration,
and provides much better performance with almost identical behavior.
Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
donotoptimize_test.cc could not be compiled under non-gnu / non-msvc compilers,
because only deprecated version of DoNotOptimize is available for these
compilers. Tests are compiled with -Werror. Patch fixes test compilation by
providing non-deprecated version of DoNotOptimize for compilers with c++11
standard support.
Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
* Add `setuptools_scm` for dynamic zero-config Python versioning
This removes the need for manually bumping versions in the Python
bindings.
For the wheel uploads, the correct semver version is inferred in the case
of tagged commits, which is exactly the case in GitHub CI.
The docs were updated to reflect the changes in the release workflow.
* Add separate version variable and module, use PEP484-compliant exports
This is the best practice mentioned in the `setuptools_scm` docs, see
https://setuptools-scm.readthedocs.io/en/latest/usage/#version-at-runtime.
This behaves the same, and saves a pre-commit step. ruff just needs an
additional package location hint to correctly map first-part packages
(in this case, `google_benchmark`).
This revealed a misformat in the `google_benchmark.__init__`, which is
now fixed.
* Add pre-commit config and GitHub Actions job
Contains the following hooks:
* buildifier - for formatting and linting Bazel files.
* mypy, ruff, isort, black - for Python typechecking, import hygiene,
static analysis, and formatting.
The pylint CI job was changed to be a pre-commit CI job, where pre-commit
is bootstrapped via Python.
Pylint is currently no longer part of the
code checks, but can be re-added if requested. The reason to drop was
that it does not play nicely with pre-commit, and lots of its
functionality and responsibilities are actually covered in ruff.
* Add dev extra to pyproject.toml for development installs
* Clarify that pre-commit contains only Python and Bazel hooks
* Add one-line docstrings to Bazel modules
* Apply buildifier pre-commit fixes to Bazel files
* Apply pre-commit fixes to Python files
* Supply --profile=black to isort to prevent conflicts
* Fix nanobind build file formatting
* Add tooling configs to `pyproject.toml`
In particular, set line length 80 for all Python files.
* Reformat all Python files to line length 80, fix return type annotations
Also ignores the `tools/compare.py` and `tools/gbench/report.py` files
for mypy, since they emit a barrage of errors which we can deal with
later. The errors are mostly related to dynamic classmethod definition.
* Add LTO builds on Windows+MSVC
Gates the MSVC switches behind an `@bazel_skylib:selects` statement.
This is a first experiment from best guesses and studying the MSVC docs.
* Fix misleading inline comment
dominic