WinrarAn original compression algorithm is introduced.It provides a high compression rate for executable files, object libraries, large text files, etc.WinRAR 4.20 makes better use of multiprocessor cores, but increases memory footprint to speed up compression.In addition, the speed of the regular RAR decompression algorithm is slightly improved. Multiple CPU cores can be used to create and process recovery volumes to achieve higher processing speed.
Update log
WinRAR 4.201. Changes in RAR compression: a) The conventional RAR compression algorithm is optimized to make better use of multiprocessor cores.The compression result of multi-core environment is better when the speed is increased in the single processor mode.The speed improvement effect depends on the data type and average file size.Multi core utilization is higher when compressing large files.b) In order to achieve faster compression speed, we have to increase the use of memory.Conventional RAR compression algorithm allocates about 120 MB of memory, while WinRAR 4.11 allocates 40 MB;c) RAR text compression cannot effectively utilize multi CPU cores, so its performance is lower than that of conventional compression in a multi processor environment.No matter how many CPUs, its decompression speed is slower than the conventional algorithm, so the text algorithm is disabled by default.If you need to maximize the compression rate of plain text data, you can enable text compression in the Advanced Compression Parameters dialog box.Click the "Compression..." button on the "Advanced" page of the compression dialog box to access it.You can also permanently modify this option in the default compression configuration;In the command line mode, you can use the - mct switch to enable text compression;d) The "fastest" (- m1) compression mode now also supports multiprocessor cores.This mode in 4.11 can only use a single processor core.2. The speed of the RAR conventional decompression algorithm is slightly improved, and different Rar compression algorithms will lead to different results.RAR decompression cannot use multiprocessor cores, so its speed does not depend on the number of cores.3. Changes in ZIP compression: a) Now ZIP compression supports multiprocessor cores, which can significantly improve performance in multi-core environments.ZIP compression is also faster than 4.11 when using a single CPU;b) The memory usage of ZIP compression has increased to about 15 MB.4. The creation and processing of recovery volumes can use multiple CPU cores to achieve higher processing speed.However, the seek speed of general hard disks is a limiting factor for recovery volumes, so the effect will be more obvious when SSDs are used.5. The current value of - mt can be set to 1 - 32 instead of 0-16.6. The "Find File" command can find the data in the 7-Zip compressed file.The previous Find File does not support the. 7z compression format.7. WinRAR and WinRAR self decompression module no longer support Windows 2000.8. The "Save Current Settings" button in the "Advanced Self extracting Options" dialog box is now only available when converting an existing compressed file to a self extracting file.This button Save Yes option only applies to the operation of converting to self extracting files.When creating or updating a self extracting file, only the self extracting option stored in the default compression configuration is used.For these operations, ignore the options saved in the Advanced Self Extraction Options dialog box.
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