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.
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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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