mirror of
https://github.com/facebook/sapling.git
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75b4f92c44
Summary: Previously, the format of an Log entry is hard-coded - length, xxhash, and content. The xxhash always takes 8 bytes. For small (ex. 40-byte) entries, xxhash32 is actually faster and takes less disk space. Introduce the "entry flags" concept so we can store some metadata about what checksum function to use. The concept could be potentially used to support other new format changes at per entry level in the future. As we're here, also support data without checksums. That can be useful for content with its own checksum, like a blob store with its own SHA1 integrity check. Performance-wise, log insertion is slower (but the majority insertaion overhead would be on the index part), iteration is a little bit faster, perhaps because the log can use less data. Before: log insertion 15.874 ms log iteration (memory) 6.778 ms log iteration (disk) 6.830 ms After: log insertion 18.114 ms log iteration (memory) 6.403 ms log iteration (disk) 6.307 ms Reviewed By: DurhamG, markbt Differential Revision: D13051386 fbshipit-source-id: 629c251633ecf85058ee7c3ce7a9f576dfac7bdf |
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| .. | ||
| argparse | ||
| bookmarkstore | ||
| cdatapack | ||
| clib | ||
| commitcloudsubscriber | ||
| configparser | ||
| encoding | ||
| hg_watchman_client | ||
| hgpython | ||
| indexedlog | ||
| linelog | ||
| lz4-pyframe | ||
| minibench | ||
| mononokeapi | ||
| mpatch | ||
| mpatch-sys | ||
| nodemap | ||
| pathmatcher | ||
| radixbuf | ||
| revisionstore | ||
| third-party | ||
| treestate | ||
| types | ||
| vlqencoding | ||
| watchman_client | ||
| zstdelta | ||
| Cargo.toml | ||
| README.md | ||
lib
Any native code (C/C++/Rust) that Mercurial (either core or extensions)
depends on should go here. Python code, or native code that depends on
Python code (e.g. #include <Python.h> or use cpython) is disallowed.
As we start to convert more of Mercurial into Rust, and write new paths entrirely in native code, we'll want to limit our dependency on Python, which is why this barrier exists.
See also hgext/extlib/README.md, mercurial/cext/README.mb.
How do I choose between lib and extlib (and cext)?
If your code is native and doesn't depend on Python (awesome!), it goes here.
Otherwise, put it in hgext/extlib (if it's only used by extensions) or
mercurial/cext (if it's used by extensions or core).