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xz: Fix outdated threading related info on the man page.
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src/xz/xz.1
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src/xz/xz.1
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@ -4,7 +4,7 @@
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.\" Authors: Lasse Collin
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.\" Jia Tan
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.\"
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.TH XZ 1 "2024-01-23" "Tukaani" "XZ Utils"
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.TH XZ 1 "2024-02-13" "Tukaani" "XZ Utils"
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.
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.SH NAME
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xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
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@ -799,8 +799,6 @@ in the single-threaded mode.
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It may vary slightly between
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.B xz
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versions.
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Memory requirements of some of the future multithreaded modes may
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be dramatically higher than that of the single-threaded mode.
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.IP \(bu 3
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DecMem contains the decompressor memory requirements.
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That is, the compression settings determine
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@ -809,6 +807,15 @@ The exact decompressor memory usage is slightly more than
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the LZMA2 dictionary size, but the values in the table
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have been rounded up to the next full MiB.
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.RE
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.IP ""
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Memory requirements of the multi-threaded mode are
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significantly higher than that of the single-threaded mode.
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With the default value of
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.BR \-\-block\-size ,
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each thread needs 3*3*DictSize plus CompMem or DecMem.
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For example, four threads with preset
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.B \-6
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needs 660\(en670\ MiB of memory.
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.TP
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.BR \-e ", " \-\-extreme
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Use a slower variant of the selected compression preset level
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@ -900,17 +907,16 @@ Using
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.I size
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less than the LZMA2 dictionary size is waste of RAM
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because then the LZMA2 dictionary buffer will never get fully used.
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The sizes of the blocks are stored in the block headers,
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which a future version of
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.B xz
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will use for multi-threaded decompression.
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In multi-threaded mode,
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the sizes of the blocks are stored in the block headers.
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This size information is required for multi-threaded decompression.
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.IP ""
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In single-threaded mode no block splitting is done by default.
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Setting this option doesn't affect memory usage.
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No size information is stored in block headers,
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thus files created in single-threaded mode
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won't be identical to files created in multi-threaded mode.
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The lack of size information also means that a future version of
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The lack of size information also means that
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.B xz
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won't be able decompress the files in multi-threaded mode.
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.TP
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