diff options
Diffstat (limited to 'src/xz/xz.1')
| -rw-r--r-- | src/xz/xz.1 | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/src/xz/xz.1 b/src/xz/xz.1 index 9dc354a0..aba0a693 100644 --- a/src/xz/xz.1 +++ b/src/xz/xz.1 @@ -5,7 +5,7 @@ .\" This file has been put into the public domain. .\" You can do whatever you want with this file. .\" -.TH XZ 1 "2010-01-15" "Tukaani" "XZ Utils" +.TH XZ 1 "2010-03-07" "Tukaani" "XZ Utils" .SH NAME xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files .SH SYNOPSIS @@ -195,9 +195,16 @@ is several gigabytes. .PP To prevent uncomfortable surprises caused by huge memory usage, .B xz -has a built-in memory usage limiter. The default limit is 40 % of total -physical RAM. While operating systems provide ways to limit the memory usage -of processes, relying on it wasn't deemed to be flexible enough. +has a built-in memory usage limiter. While some operating systems provide +ways to limit the memory usage of processes, relying on it wasn't deemed +to be flexible enough. The default limit depends on the total amount of +physical RAM: +.IP \(bu 3 +If 40\ % of RAM is at least 80 MiB, 40\ % of RAM is used as the limit. +.IP \(bu 3 +If 80\ % of RAM is over 80 MiB, 80 MiB is used as the limit. +.IP \(bu 3 +Otherwise 80\ % of RAM is used as the limit. .PP When compressing, if the selected compression settings exceed the memory usage limit, the settings are automatically adjusted downwards and a notice @@ -588,9 +595,11 @@ can be specified as a percentage of physical RAM. Example: .IP \(bu 3 The .I limit -can be reset back to its default value (currently 40 % of physical RAM) -by setting it to +can be reset back to its default value by setting it to .BR 0 . +See the section +.B "Memory usage" +for how the default limit is defined. .IP \(bu 3 The memory usage limiting can be effectively disabled by setting .I limit |