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remove docs/misc/create_compression.txt

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outdated - it just showed different levels of zlib compression,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 2015-08-29 13:35:58 +02:00
parent 31e97d568b
commit 2332ee433e
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130
docs/misc/create_compression.txt
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@ -1,130 +0,0 @@
data compression
================
borg create --compression N repo::archive data
Currently, borg only supports zlib compression. There are plans to expand this
to other, faster or better compression algorithms in the future.
N == 0 -> zlib level 0 == very quick, no compression
N == 1 -> zlib level 1 == quick, low compression
...
N == 9 -> zlib level 9 == slow, high compression
Measurements made on a Haswell Ultrabook, SSD storage, Linux.
Example 1: lots of relatively small text files (linux kernel src)
-----------------------------------------------------------------
N == 1 does a good job here, it saves the additional time needed for
compression because it needs to store less into storage (see N == 0).
N == 6 is also quite ok, a little slower, a little less repo size.
6 was the old default of borg.
High compression levels only give a little more compression, but take a lot
of cpu time.
$ borg create --stats --compression 0
------------------------------------------------------------------------------
Duration: 50.40 seconds
Number of files: 72890
Original size Compressed size Deduplicated size
This archive: 1.17 GB 1.18 GB 1.01 GB
Unique chunks Total chunks
Chunk index: 70263 82309
------------------------------------------------------------------------------
$ borg create --stats --compression 1
------------------------------------------------------------------------------
Duration: 49.29 seconds
Number of files: 72890
Original size Compressed size Deduplicated size
This archive: 1.17 GB 368.62 MB 295.22 MB
Unique chunks Total chunks
Chunk index: 70280 82326
------------------------------------------------------------------------------
$ borg create --stats --compression 5
------------------------------------------------------------------------------
Duration: 59.99 seconds
Number of files: 72890
Original size Compressed size Deduplicated size
This archive: 1.17 GB 331.70 MB 262.20 MB
Unique chunks Total chunks
Chunk index: 70290 82336
------------------------------------------------------------------------------
$ borg create --stats --compression 6
------------------------------------------------------------------------------
Duration: 1 minutes 13.64 seconds
Number of files: 72890
Original size Compressed size Deduplicated size
This archive: 1.17 GB 328.79 MB 259.56 MB
Unique chunks Total chunks
Chunk index: 70279 82325
------------------------------------------------------------------------------
$ borg create --stats --compression 9
------------------------------------------------------------------------------
Duration: 3 minutes 1.58 seconds
Number of files: 72890
Original size Compressed size Deduplicated size
This archive: 1.17 GB 326.57 MB 257.57 MB
Unique chunks Total chunks
Chunk index: 70292 82338
------------------------------------------------------------------------------
Example 2: large VM disk file (sparse file)
-------------------------------------------
The file's directory size is 80GB, but a lot of it is sparse (and reads as
zeros).
$ borg create --stats --compression 0
------------------------------------------------------------------------------
Duration: 13 minutes 48.47 seconds
Number of files: 1
Original size Compressed size Deduplicated size
This archive: 80.54 GB 80.55 GB 10.87 GB
Unique chunks Total chunks
Chunk index: 147307 177109
------------------------------------------------------------------------------
$ borg create --stats --compression 1
------------------------------------------------------------------------------
Duration: 15 minutes 31.34 seconds
Number of files: 1
Original size Compressed size Deduplicated size
This archive: 80.54 GB 6.68 GB 5.67 GB
Unique chunks Total chunks
Chunk index: 147309 177111
------------------------------------------------------------------------------
$ borg create --stats --compression 6
------------------------------------------------------------------------------
Duration: 18 minutes 57.54 seconds
Number of files: 1
Original size Compressed size Deduplicated size
This archive: 80.54 GB 6.19 GB 5.44 GB
Unique chunks Total chunks
Chunk index: 147307 177109
------------------------------------------------------------------------------