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genbackupdata - generate backup test data


genbackupdata [--chunk-size=SIZE] [--config=FILE] [-c=SIZE] [--create=SIZE]
[--depth=DEPTH] [--dump-config] [--dump-memory-profile=METHOD] [--dump-setting-names]
[--file-size=SIZE] [--generate-manpage=TEMPLATE] [-h] [--help] [--help-all]
[--list-config-files] [--log=FILE] [--log-keep=N] [--log-level=LEVEL] [--log-max=SIZE]
[--log-mode=MODE] [--max-files=MAX-FILES] [--memory-dump-interval=SECONDS]
[--no-default-configs] [--no-quiet] [--output=FILE] [--quiet] [--seed=SEED] [--version]


genbackupdata generates test data sets for performance testing of backup software. It
creates a directory tree filled with files of different sizes. The total size and the
distribution of sizes between small and big are configurable. The program can also modify
an existing directory tree by creating new files, and deleting, renaming, or modifying
existing files. This can be used to generate test data for successive generations of

The program is deterministic: with a given set of parameters (and a given pre-existing
directory tree), it always creates the same output. This way, it is possible to reproduce
backup tests exactly, without having to distribute the potentially very large test sets.

The data set consists of plain files and directories. Files are either small text files
or big binary files. Text files contain the "lorem ipsum" stanza, binary files contain
randomly generated byte streams. The percentage of file data that is small text or big
binary files can be set, as can the sizes of the respective file types.

Files and directories are named "fileXXXX" or "dirXXXX", where "XXXX" is a successive
integer, separate successions for files and directories. There is an upper limit to how
many files a directory may contain. After the file limit is reached, a new sub-directory
is created. The first set of files go into the root directory of the test set.

You have to give one of the options --create, --delete, --rename, or --modify for the
program to do anything. You can, however, give more than one of them, if DIR already
exists. (Giving the same option more than once means that only the last instance is
counted.) (DIR) is created if it doesn't exist already.


generate data in chunks of this size

-c, --create=SIZE
how much data to create (default: 0)

depth of directory tree

size of one file


-h, --help
show this help message and exit

max files/dirs per dir


write output to FILE, instead of standard output

do not report progress

seed for random number generator

show program's version number and exit

Configuration files and settings
add FILE to config files

write out the entire current configuration


show all options


clear list of configuration files to read

write log entries to FILE (default is to not write log files at all); use "syslog"
to log to system log, or "none" to disable logging

keep last N logs (10)

log at LEVEL, one of debug, info, warning, error, critical, fatal (default: debug)

rotate logs larger than SIZE, zero for never (default: 0)

set permissions of new log files to MODE (octal; default 0600)

make memory profiling dumps using METHOD, which is one of: none, simple, or meliae
(default: simple)

make memory profiling dumps at least SECONDS apart


Create data for the first generation of a backup:

genbackupdata --create=10G testdir

Modify an existing set of backup data to create a new generation:

genbackupdata -c 5% -d 2% -m 5% -r 0.5% testdir

The above command can be run for each new generation.


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