SimonSapin created this revision. Herald added a reviewer: hg-reviewers. Herald added a subscriber: mercurial-patches.
REVISION SUMMARY This is particularly useful when profiling. REPOSITORY rHG Mercurial BRANCH default REVISION DETAIL https://phab.mercurial-scm.org/D9625 AFFECTED FILES .hgignore rust/README.rst CHANGE DETAILS diff --git a/rust/README.rst b/rust/README.rst --- a/rust/README.rst +++ b/rust/README.rst @@ -40,7 +40,7 @@ You might want to check the `features` section in ``hg-cpython/Cargo.toml``. It may contain features that might be interesting to try out. -To use features from the Makefile, use the `HG_RUST_FEATURES` environment +To use features from the Makefile, use the `HG_RUST_FEATURES` environment variable: for instance `HG_RUST_FEATURES="some-feature other-feature"` Profiling @@ -51,6 +51,14 @@ indicate why the rust code cannot be used (say, using lookarounds in hgignore). +Creating a ``.cargo/config`` file with the following content enables +debug information in optimized builds. This make profiles more informative +with source file name and line number for Rust stack frames and +(in some cases) stack frames for Rust functions that have been inlined. + + [profile.release] + debug = true + ``py-spy`` (https://github.com/benfred/py-spy) can be used to construct a single profile with rust functions and python functions (as opposed to ``hg --profile``, which attributes time spent in rust @@ -58,6 +66,11 @@ as opposed to tools for native code like ``perf``, which attribute time to the python interpreter instead of python functions). +Example usage: + + $ make PURE=--rust local # Don't forget to recompile after a code change + $ py-spy record --native --output /tmp/profile.svg -- ./hg ... + Developing Rust =============== diff --git a/.hgignore b/.hgignore --- a/.hgignore +++ b/.hgignore @@ -64,6 +64,10 @@ # Generated wheels wheelhouse/ +syntax: rootglob +# See Profiling in rust/README.rst +.cargo/config + syntax: regexp ^\.pc/ ^\.(pydev)?project To: SimonSapin, #hg-reviewers Cc: mercurial-patches, mercurial-devel _______________________________________________ Mercurial-devel mailing list Mercurial-devel@mercurial-scm.org https://www.mercurial-scm.org/mailman/listinfo/mercurial-devel
