WINRAR 4.20 is a powerful archive manager. It can backup your data and reduce the size of email attachments, decompress RAR, ZIP and other files downloaded
from Internet and create new archives in RAR and ZIP file format.
Changes in RAR compression RAR general compression algorithm is
optimized for better utilization of several processor cores. While some
speed gain is possible even in single processor mode, best results are
achieved in multi-core environment. Speed gain depends on data type and average file size. Several cores are utilized more efficiently when compressing large files.
WINRAR 4.20 had to increase memory
requirements to achieve higher compression speed. General RAR
compression algorithm allocates about 120 MB comparing to 40 MB in WINRAR 4.20.
muhammadniaz.blogspot.com WINRAR
4.20 text compression algorithm cannot utilize several CPU cores
efficiently, so its performance in multiprocessor environment is much
lower than for general algorithm. Also its decompression speed is much
lower than in general algorithm regardless of CPU number. So we decided
to disable the text algorithm by default. If you need maximum possible
compression ratio for plain text data regardless of speed, you can
enable the text compression in "Advanced compression parameter" dialog.
Press "Compression" button on "Advanced" page of archiving dialog to
access it. You can also change this option permanently in default
compression profile; In the command line mode the text compression can
be enabled with much switch.
"Fastest" (-m1) compression mode also supports several processor cores now. In 4.11 it could use only a single processor core. WINRAR
4.20 general decompression algorithm speed is slightly improved,though
not same extent as RAR compression. RAR decompression is not able to
use several processor cores, so its performance does not depend on a
number of cores. Changes in ZIP compression: now ZIP compression
supports several processor cores resulting in noticeably higher
performance in multi-core environment. Single CPU ZIP compression is
also faster than in 4.11; Memory use for ZIP compression is increased to
about 15 MB.
Recovery
volume creating and processing can use several CPU cores resulting in
higher speed. Though, typically hard drive seek speed is a limiting
factor for recovery volumes, so this gain is most noticeable when
working with solid state drive. Now the allowed value for -mt switch is
1 - 32, not 0 - 16 as before. "Find files" command can search data in
7-Zip archives. Previously "Find files" did not support .7z archive
format. Windows 2000 is not supported by WINRAR 4.20 and WINRAR 4.20 self-extracting modules anymore.
"Save
current settings" button in "Advanced SFX options" dialog is now
available only when converting an existing archive to SFX. Options saved
with this button are applied only to convert to SFX operation.
If
you create or update SFX archive, only SFX options stored in default
compression profile are used. Options saved in "Advanced SFX options"
dialog are ignored for these operations.
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