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31.

Once the target file has been successfully closed, the source I<file> is removed unless B<--keep> was specified. The source I<file> is never removed if the output is written to standard output.

32.

Sending B<SIGINFO> or B<SIGUSR1> to the B<xz> process makes it print progress information to standard error. This has only limited use since when standard error is a terminal, using B<--verbose> will display an automatically updating progress indicator.

33.

Memory usage

34.

The memory usage of B<xz> varies from a few hundred kilobytes to several gigabytes depending on the compression settings. The settings used when compressing a file determine the memory requirements of the decompressor. Typically the decompressor needs 5\ % to 20\ % of the amount of memory that the compressor needed when creating the file. For example, decompressing a file created with B<xz -9> currently requires 65\ MiB of memory. Still, it is possible to have B<.xz> files that require several gigabytes of memory to decompress.

35.

Especially users of older systems may find the possibility of very large memory usage annoying. To prevent uncomfortable surprises, B<xz> has a built-in memory usage limiter, which is disabled by default. While some operating systems provide ways to limit the memory usage of processes, relying on it wasn't deemed to be flexible enough (e.g. using B<ulimit>(1) to limit virtual memory tends to cripple B<mmap>(2)).

36.

The memory usage limiter can be enabled with the command line option B<--memlimit=>I<limit>. Often it is more convenient to enable the limiter by default by setting the environment variable B<XZ_DEFAULTS>, e.g.\& B<XZ_DEFAULTS=--memlimit=150MiB>. It is possible to set the limits separately for compression and decompression by using B<--memlimit-compress=>I<limit> and B<--memlimit-decompress=>I<limit>. Using these two options outside B<XZ_DEFAULTS> is rarely useful because a single run of B<xz> cannot do both compression and decompression and B<--memlimit=>I<limit> (or B<-M> I<limit>) is shorter to type on the command line.

37.

If the specified memory usage limit is exceeded when decompressing, B<xz> will display an error and decompressing the file will fail. If the limit is exceeded when compressing, B<xz> will try to scale the settings down so that the limit is no longer exceeded (except when using B<--format=raw> or B<--no-adjust>). This way the operation won't fail unless the limit is very small. The scaling of the settings is done in steps that don't match the compression level presets, e.g. if the limit is only slightly less than the amount required for B<xz -9>, the settings will be scaled down only a little, not all the way down to B<xz -8>.

38.

Concatenation and padding with .xz files

39.

It is possible to concatenate B<.xz> files as is. B<xz> will decompress such files as if they were a single B<.xz> file.

40.

It is possible to insert padding between the concatenated parts or after the last part. The padding must consist of null bytes and the size of the padding must be a multiple of four bytes. This can be useful e.g. if the B<.xz> file is stored on a medium that measures file sizes in 512-byte blocks.