39 lines
1.8 KiB
Plaintext
39 lines
1.8 KiB
Plaintext
when use linux xz command to create .xz file for embedded device to decompress, memory must be taken into
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consideration.
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to control memory used, following opt should be considerated:
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(https://www.freebsd.org/cgi/man.cgi?query=xz&sektion=1)
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--memlimit-compress=limit
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--memlimit-decompress=limit
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--lzma2[=options]
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Add LZMA1 or LZMA2 filter to the filter chain. These filters
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can be used only as the last filter in the chain.
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LZMA1 is a legacy filter, which is supported almost solely due
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to the legacy .lzma file format, which supports only LZMA1.
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LZMA2 is an updated version of LZMA1 to fix some practical
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issues of LZMA1. The .xz format uses LZMA2 and doesn't support
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LZMA1 at all. Compression speed and ratios of LZMA1 and LZMA2
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are practically the same.
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LZMA1 and LZMA2 share the same set of options:
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preset=preset
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Reset all LZMA1 or LZMA2 options to preset. Preset con-
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sist of an integer, which may be followed by single-let-
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ter preset modifiers. The integer can be from 0 to 9,
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matching the command line options -0 ... -9. The only
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supported modifier is currently e, which matches
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--extreme. If no preset is specified, the default values
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of LZMA1 or LZMA2 options are taken from the preset 6.
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dict=size
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--info-memory
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Display, in human-readable format, how much physical memory
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(RAM) xz thinks the system has and the memory usage limits for
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compression and decompression, and exit successfully.
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xz --keep --check=crc32 --memlimit-decompress=32KiB --lzma2=dict=32KiB toxz.bin |