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xz: Try to clarify --memlimit-mt-decompress vs. --memlimit-compress.

This commit is contained in:
Lasse Collin 2022-08-22 17:27:19 +03:00
parent df23c31000
commit 311e4f85ed
1 changed files with 19 additions and 12 deletions
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src/xz/xz.1
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@ -5,7 +5,7 @@
.\" This file has been put into the public domain. .\" This file has been put into the public domain.
.\" You can do whatever you want with this file. .\" You can do whatever you want with this file.
.\" .\"
.TH XZ 1 "2022-08-19" "Tukaani" "XZ Utils" .TH XZ 1 "2022-08-22" "Tukaani" "XZ Utils"
. .
.SH NAME .SH NAME
xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
@ -1067,22 +1067,26 @@ for possible ways to specify the
.IR limit . .IR limit .
.TP .TP
.BI \-\-memlimit\-mt\-decompress= limit .BI \-\-memlimit\-mt\-decompress= limit
Set a memory usage limit for decompression that can only affect Set a memory usage limit for multi-threaded decompression.
the number of threads. This can only affect the number of threads;
Unlike this will never make
.BR \-\-memlimit\-decompress ,
this
.I limit
will never make
.B xz .B xz
refuse to decompress a file. refuse to decompress a file.
If even single-threaded mode will exceed the If
.I limit .I limit
then the is too low to allow any multi-threading, the
.I limit .I limit
is ignored and is ignored and
.B xz .B xz
will decompress in single-threaded mode anyway. will continue in single-threaded mode.
Note that if also
.B \-\-memlimit\-decompress
is used,
it will always apply to both single-threaded and multi-threaded modes,
and so the effective
.I limit
for multi-threading will never be higher than the limit set with
.BR \-\-memlimit\-decompress .
.IP "" .IP ""
In contrast to the other memory usage limit options, In contrast to the other memory usage limit options,
.BI \-\-memlimit\-mt\-decompress= limit .BI \-\-memlimit\-mt\-decompress= limit
@ -1115,7 +1119,10 @@ Setting
.I limit .I limit
to to
.B 0 .B 0
resets it to the default system-specific value. resets the
.I limit
to the default system-specific value.
.IP ""
.TP .TP
\fB\-M\fR \fIlimit\fR, \fB\-\-memlimit=\fIlimit\fR, \fB\-\-memory=\fIlimit \fB\-M\fR \fIlimit\fR, \fB\-\-memlimit=\fIlimit\fR, \fB\-\-memory=\fIlimit
This is equivalent to specifying This is equivalent to specifying