INTRODUCTION
-This is wimlib version 1.7.5-BETA (January 2015). wimlib is a C library for
+This is wimlib version 1.8.0-BETA (February 2015). wimlib is a C library for
creating, modifying, extracting, and mounting files in the Windows Imaging
Format (WIM files). wimlib and its command-line frontend 'wimlib-imagex'
provide a free and cross-platform alternative to Microsoft's WIMGAPI, ImageX,
COMPRESSION RATIO
wimlib (and wimlib-imagex) can create XPRESS, LZX, or LZMS compressed WIM files.
-wimlib includes its own compression codecs and does not use the compression API
-available on some versions of Windows.
-
-I have gradually been improving the compression codecs in wimlib. For XPRESS
-and LZX, they now usually outperform and outcompress the equivalent Microsoft
-implementations. Although results will vary depending on the data being
-compressed, in the table below I present the results for a common use case:
-compressing an x86 Windows PE image. Each row displays the compression type,
-the size of the resulting WIM file in bytes, and how many seconds it took to
-create the file. When applicable, the results with the equivalent Microsoft
-implementation in WIMGAPI is included.
+wimlib's compression codecs usually outperform and outcompress their Microsoft
+equivalents. Although results will vary depending on the data being compressed,
+the table below shows results for a common use case: creating an x86 Windows PE
+image ("boot.wim"). Each row shows the compression type, the size of the
+resulting WIM file in bytes, and the time it took to create the file. When
+possible, the results with the Microsoft equivalent are included.
=============================================================================
- | Compression || wimlib (v1.7.5-BETA) | WIMGAPI (Windows 8.1) |
+ | Compression || wimlib (v1.8.0) | WIMGAPI (Windows 8.1) |
=============================================================================
| None [1] || 361,314,224 in 2.4s | 361,315,338 in 4.5s |
| XPRESS [2] || 138,218,750 in 3.0s | 140,457,436 in 6.0s |
| LZX (quick) [4] || 130,207,195 in 3.8s | N/A |
| LZX (normal) [5] || 126,522,539 in 10.4s | 127,293,240 in 19.2s |
| LZX (slow) [6] || 126,042,313 in 17.3s | N/A |
- | LZMS (non-solid) [7] || 121,909,792 in 11.9s | N/A |
- | LZMS (solid) [8] || 93,650,936 in 45.0s | 88,771,192 in 109.2 |
+ | LZMS (non-solid) [7] || 116,150,682 in 25.3s | N/A |
+ | LZMS (solid) [8] || 88,107,484 in 61.7s | 88,769,830 in 102.3s |
| "WIMBoot" [9] || 167,023,719 in 3.5s | 169,109,211 in 10.4s |
| "WIMBoot" (slow) [10] || 165,027,583 in 7.9s | N/A |
=============================================================================
[8] '--solid' for wimlib-imagex. Should be '/compress:recovery' for DISM,
but only works for /Export-Image, not /Capture-Image. Compression chunk
- size in solid resources defaults to 33554432 for wimlib, 67108864 for
- DISM.
+ size in solid resources defaults to 67108864 bytes in both cases.
[9] '--wimboot' for wimlib-imagex; '/wimboot' for DISM.
This is really XPRESS compression with 4096 byte chunks, so the same as
The compression ratio provided by wimlib is also competitive with commonly used
archive formats. Below are file sizes that result when the Canterbury corpus is
-compressed with wimlib (v1.7.2), WIMGAPI (Windows 8.1), and some other
+compressed with wimlib (v1.8.0), WIMGAPI (Windows 8.1), and some other
formats/programs:
=====================================================
| WIM (WIMGAPI, LZX) | 651,866 |
| WIM (wimlib, LZX normal) | 624,634 |
| WIM (wimlib, LZX slow) | 620,728 |
- | WIM (wimlib, LZMS non-solid) | 581,960 |
+ | WIM (wimlib, LZMS non-solid) | 581,046 |
| tar.bz2 (bzip, default) | 565,008 |
| tar.bz2 (bzip, -9) | 565,008 |
- | WIM (wimlib, LZX solid) | 527,688 |
- | WIM (wimlib, LZMS solid) | 525,990 |
- | WIM (wimlib, LZMS solid, slow) | 523,728 |
- | WIM (wimlib, LZX solid, slow) | 522,042 |
| WIM (WIMGAPI, LZMS solid) | 521,366 |
- | WIM (wimlib, LZX solid, very slow) | 519,546 |
+ | WIM (wimlib, LZMS solid) | 515,800 |
| tar.xz (xz, default) | 486,916 |
| tar.xz (xz, -9) | 486,904 |
| 7z (7-zip, default) | 484,700 |
git://wimlib.net / wimlib / blobdiff