mirror of https://github.com/borgbackup/borg.git
remove docs/misc/create_compression.txt
outdated - it just showed different levels of zlib compression, but not we additionally have "lzma", "lz4" and "none" compression. the "usage" and "internals" docs give some hints about them, too.
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Thomas Waldmann
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31e97d568b
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data compression
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================
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borg create --compression N repo::archive data
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Currently, borg only supports zlib compression. There are plans to expand this
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to other, faster or better compression algorithms in the future.
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N == 0 -> zlib level 0 == very quick, no compression
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N == 1 -> zlib level 1 == quick, low compression
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...
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N == 9 -> zlib level 9 == slow, high compression
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Measurements made on a Haswell Ultrabook, SSD storage, Linux.
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Example 1: lots of relatively small text files (linux kernel src)
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-----------------------------------------------------------------
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N == 1 does a good job here, it saves the additional time needed for
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compression because it needs to store less into storage (see N == 0).
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N == 6 is also quite ok, a little slower, a little less repo size.
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6 was the old default of borg.
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High compression levels only give a little more compression, but take a lot
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of cpu time.
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$ borg create --stats --compression 0
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------------------------------------------------------------------------------
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Duration: 50.40 seconds
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Number of files: 72890
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Original size Compressed size Deduplicated size
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This archive: 1.17 GB 1.18 GB 1.01 GB
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Unique chunks Total chunks
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Chunk index: 70263 82309
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------------------------------------------------------------------------------
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$ borg create --stats --compression 1
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------------------------------------------------------------------------------
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Duration: 49.29 seconds
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Number of files: 72890
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Original size Compressed size Deduplicated size
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This archive: 1.17 GB 368.62 MB 295.22 MB
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Unique chunks Total chunks
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Chunk index: 70280 82326
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------------------------------------------------------------------------------
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$ borg create --stats --compression 5
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------------------------------------------------------------------------------
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Duration: 59.99 seconds
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Number of files: 72890
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Original size Compressed size Deduplicated size
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This archive: 1.17 GB 331.70 MB 262.20 MB
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Unique chunks Total chunks
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Chunk index: 70290 82336
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------------------------------------------------------------------------------
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$ borg create --stats --compression 6
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------------------------------------------------------------------------------
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Duration: 1 minutes 13.64 seconds
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Number of files: 72890
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Original size Compressed size Deduplicated size
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This archive: 1.17 GB 328.79 MB 259.56 MB
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Unique chunks Total chunks
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Chunk index: 70279 82325
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------------------------------------------------------------------------------
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$ borg create --stats --compression 9
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------------------------------------------------------------------------------
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Duration: 3 minutes 1.58 seconds
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Number of files: 72890
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Original size Compressed size Deduplicated size
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This archive: 1.17 GB 326.57 MB 257.57 MB
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Unique chunks Total chunks
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Chunk index: 70292 82338
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------------------------------------------------------------------------------
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Example 2: large VM disk file (sparse file)
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-------------------------------------------
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The file's directory size is 80GB, but a lot of it is sparse (and reads as
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zeros).
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$ borg create --stats --compression 0
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------------------------------------------------------------------------------
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Duration: 13 minutes 48.47 seconds
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Number of files: 1
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Original size Compressed size Deduplicated size
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This archive: 80.54 GB 80.55 GB 10.87 GB
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Unique chunks Total chunks
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Chunk index: 147307 177109
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------------------------------------------------------------------------------
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$ borg create --stats --compression 1
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------------------------------------------------------------------------------
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Duration: 15 minutes 31.34 seconds
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Number of files: 1
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Original size Compressed size Deduplicated size
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This archive: 80.54 GB 6.68 GB 5.67 GB
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Unique chunks Total chunks
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Chunk index: 147309 177111
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------------------------------------------------------------------------------
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$ borg create --stats --compression 6
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------------------------------------------------------------------------------
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Duration: 18 minutes 57.54 seconds
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Number of files: 1
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Original size Compressed size Deduplicated size
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This archive: 80.54 GB 6.19 GB 5.44 GB
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Unique chunks Total chunks
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Chunk index: 147307 177109
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------------------------------------------------------------------------------
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