xz: Try to clarify --memlimit-mt-decompress vs. --memlimit-compress.
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src/xz/xz.1
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src/xz/xz.1
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@ -5,7 +5,7 @@
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.\" This file has been put into the public domain.
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.\" You can do whatever you want with this file.
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.\"
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.TH XZ 1 "2022-08-19" "Tukaani" "XZ Utils"
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.TH XZ 1 "2022-08-22" "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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@ -1067,22 +1067,26 @@ for possible ways to specify the
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.IR limit .
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.TP
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.BI \-\-memlimit\-mt\-decompress= limit
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Set a memory usage limit for decompression that can only affect
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the number of threads.
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Unlike
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.BR \-\-memlimit\-decompress ,
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this
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.I limit
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will never make
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Set a memory usage limit for multi-threaded decompression.
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This can only affect the number of threads;
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this will never make
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.B xz
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refuse to decompress a file.
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If even single-threaded mode will exceed the
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If
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.I limit
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then the
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is too low to allow any multi-threading, the
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.I limit
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is ignored and
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.B xz
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will decompress in single-threaded mode anyway.
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will continue in single-threaded mode.
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Note that if also
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.B \-\-memlimit\-decompress
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is used,
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it will always apply to both single-threaded and multi-threaded modes,
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and so the effective
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.I limit
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for multi-threading will never be higher than the limit set with
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.BR \-\-memlimit\-decompress .
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.IP ""
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In contrast to the other memory usage limit options,
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.BI \-\-memlimit\-mt\-decompress= limit
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@ -1115,7 +1119,10 @@ Setting
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.I limit
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to
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.B 0
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resets it to the default system-specific value.
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resets the
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.I limit
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to the default system-specific value.
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.IP ""
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.TP
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\fB\-M\fR \fIlimit\fR, \fB\-\-memlimit=\fIlimit\fR, \fB\-\-memory=\fIlimit
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This is equivalent to specifying
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