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WIMOPTIMIZE(1)
User Commands
WIMOPTIMIZE(1)
NAME
wimoptimize − Optimize a WIM archive
SYNOPSIS
wimoptimize
WIMFILE
[OPTION...]
DESCRIPTION
wimoptimize,
or equivalently
wimlib-imagex optimize,
rebuilds the standalone WIM archive
WIMFILE.
The new WIM is written to a temporary file, and it is renamed to the original file when it’s ready. This will
remove any holes that have been left in the WIM as a result of appending or deleting files or images, so the
new WIM may be smaller than the old WIM.
By default,
wimoptimize
will reuse (not recompress) compressed data and will not change the solid or
pipable status of the WIM. However, it can also perform recompression and/or convert between solid, non-
solid, pipable, and non-pipable WIMs; see the options and examples below.
OPTIONS
--check
Before optimizing the WIM, verify its integrity if it contains extra integrity information. Also
include extra integrity information in the optimized WIM, even if it was not present before.
--nocheck
Do not include extra integrity information in the optimized WIM, even if it was present before.
--include-integrity
Include extra integrity information in the optimized WIM, i.e. like
--check
but don’t also verify the
WIM beforehand.
--recompress
Recompress all data in the WIM while optimizing it. This will significantly increase the time
needed to optimize the WIM, but it may result in a better compression ratio if wimlib can do a better
job than the program that created the WIM --- which is likely the case if the WIM was Microsoft-
created, as wimlib’s compressors are slightly stronger.
--compress=TYPE[:LEVEL]
Recompress the WIM using the specified compression type, and optionally the specified compres-
sion level for that compression type. This implies
--recompress.
See the documentation for this
option to
wimcapture(1)
for more details.
--chunk-size=SIZE
Set the WIM compression chunk size to
SIZE.
See the documentation for this option to
wimcap-
ture(1)
for more details.
--solid
Create a "solid" archive that compresses multiple files together. This usually results in a signifi-
cantly better compression ratio but has disadvantages such as reduced compatibility. See the docu-
mentation for this option to
wimcapture(1)
for more details.
--solid-compress=TYPE[:LEVEL]
Like
--compress,
but set the compression type used in solid resources. See the documentation for
this option to
wimcapture(1)
for more details.
--solid-chunk-size=SIZE
Like
--chunk-size,
but set the chunk size used in solid resources. See the documentation for this
option to
wimcapture(1)
for more details.
--threads=NUM_THREADS
Number of threads to use for compressing data. Default: autodetect (number of processors).
--pipable
Rebuild the WIM so that it can be applied fully sequentially, including from a pipe. See
wimcap-
ture(1)
for more details about creating pipable WIMs. By default, when neither
--pipable
or
--not-
pipable
is specified, the optimized WIM will be pipable if and only if it was pipable before.
wimlib 1.13.0
November 2018
1
WIMOPTIMIZE(1)
User Commands
WIMOPTIMIZE(1)
--not-pipable
Rebuild the WIM in the non-pipable format.
--unsafe-compact
Compact the WIM in-place, without using a temporary file. Existing resources are shifted down to
fill holes and new resources are appended as needed. The WIM is truncated to its final size, which
may shrink the on-disk file. This is more efficient than a full rebuild, but it is only supported when
no recompression is being done. More importantly, AN UNSAFE COMPACTION OPERATION
CANNOT BE SAFELY INTERRUPTED! If the operation is interrupted, then the WIM will be cor-
rupted, and it may be impossible (or at least very difficult) to recover any data from it. Users of this
option are expected to know what they are doing and assume responsibility for any data corruption
that may result.
NOTES
wimoptimize
does not support split WIMs or delta WIMs. For such files, consider using
wimexport(1)
instead. Note that
wimoptimize
is roughly equivalent to:
wimexport
WIMFILE
all tmp.wim && mv tmp.wim
WIMFILE
EXAMPLES
Rebuild ’install.wim’:
wimoptimize install.wim
Rebuild and recompress ’install.wim’:
wimoptimize install.wim --recompress
Rebuild and recompress ’install.wim’ using LZX ("maximum") compression at a higher-than-default com-
pression level. The compression chunk size remains unchanged. This command will be slow, but it might
be useful for optimizing files for distribution. See
https://wimlib.net/compression.html
for some benchmark
results.
wimoptimize install.wim --compress=LZX:100
Recompress ’install.wim’ using solid-mode compression, then rename it to ´install.esd´. This will decrease
the archive size significantly. (Also consider using ’wimexport install.wim all install.esd --solid’.):
wimoptimize install.wim --solid
mv install.wim install.esd
SEE ALSO
wimlib-imagex(1) wimexport(1) wimverify(1)
wimlib 1.13.0
November 2018
2

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