Mercurial > hg
comparison contrib/python-zstandard/NEWS.rst @ 31796:e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from
https://github.com/indygreg/python-zstandard is imported without
modifications (other than removing unwanted files).
Updates relevant to Mercurial include:
* Support for multi-threaded compression (we can use this for
bundle and wire protocol compression).
* APIs for batch compression and decompression operations using
multiple threads and optimal memory allocation mechanism. (Can
be useful for revlog perf improvements.)
* A ``BufferWithSegments`` type that models a single memory buffer
containing N discrete items of known lengths. This type can be
used for very efficient 0-copy data operations.
# no-check-commit
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Sat, 01 Apr 2017 15:24:03 -0700 |
| parents | c32454d69b85 |
| children | 39d36c2db68e |
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| 31795:2b130e26c3a4 | 31796:e0dc40530c5a |
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| 1 Version History | 1 Version History |
| 2 =============== | 2 =============== |
| 3 | |
| 4 0.8.0 (released 2017-03-08) | |
| 5 --------------------------- | |
| 6 | |
| 7 * CompressionParameters now has a estimated_compression_context_size() method. | |
| 8 zstd.estimate_compression_context_size() is now deprecated and slated for | |
| 9 removal. | |
| 10 * Implemented a lot of fuzzing tests. | |
| 11 * CompressionParameters instances now perform extra validation by calling | |
| 12 ZSTD_checkCParams() at construction time. | |
| 13 * multi_compress_to_buffer() API for compressing multiple inputs as a | |
| 14 single operation, as efficiently as possible. | |
| 15 * ZSTD_CStream instances are now used across multiple operations on | |
| 16 ZstdCompressor instances, resulting in much better performance for | |
| 17 APIs that do streaming. | |
| 18 * ZSTD_DStream instances are now used across multiple operations on | |
| 19 ZstdDecompressor instances, resulting in much better performance for | |
| 20 APIs that do streaming. | |
| 21 * train_dictionary() now releases the GIL. | |
| 22 * Support for training dictionaries using the COVER algorithm. | |
| 23 * multi_decompress_to_buffer() API for decompressing multiple frames as a | |
| 24 single operation, as efficiently as possible. | |
| 25 * Support for multi-threaded compression. | |
| 26 * Disable deprecation warnings when compiling CFFI module. | |
| 27 * Fixed memory leak in train_dictionary(). | |
| 28 * Removed DictParameters type. | |
| 29 * train_dictionary() now accepts keyword arguments instead of a | |
| 30 DictParameters instance to control dictionary generation. | |
| 3 | 31 |
| 4 0.7.0 (released 2017-02-07) | 32 0.7.0 (released 2017-02-07) |
| 5 --------------------------- | 33 --------------------------- |
| 6 | 34 |
| 7 * Added zstd.get_frame_parameters() to obtain info about a zstd frame. | 35 * Added zstd.get_frame_parameters() to obtain info about a zstd frame. |