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Vast speech unistar this left uncleaned what is vietnamese anytime Generally, however, the rank order of compressors is similar to that of other benchmarks. Compression Ratings by Sami Runsas ranks programs on 5 GB of various data types from public sources using a score that combines size and speed. The data includes English text, executable code, RGB and grayscale images, CD quality audio, and a mix of data types from two video games. Some of the 10 data sets contains multiple files. Single file compressors are tested on equivalent tar file. Compressed sizes include the size of the decompression program source code or executable program compressed with 7zip. Run times are measured from RAM-disk to avoid I O delays. Programs must pass a qualifying round with minimum compression ratio and time requirements on a small data set. The benchmark includes a calculator that allows the user to rank compressors using different weightings for the importance of size, compression speed, and decompression speed. The default scale is 1 lower ratio or twice the total time is worth half the rating. This is effectively the same formula used by As of June 2012 programs were tested with 682 combinations of options. The top ranked programs for the default settings were nanozip followed by freearc, CCM, flashzip, and 7-zip. There are additional benchmarks that compare BWT based compressors and bzip2-compatible compressors, and additional benchmarks for some special file types. Some other benchmarks are mentioned briefly. Squeeze Chart by Stephen ranks programs on 6 GB of mostly private data of various types by size only. The top ranked is paq8px_v67 as of Dec. 28. Monster of Compression by Nania ranks programs by size on 1,420 bytes of mostly public data of various types with a 40 minute time limit. There are separate tests for single file compressors and archivers. As of Dec. 20 the top ranked archiver is nanozip 0a and the top ranked file compressor is ccmx 1c. Both use context mixing. UCLC by Johan de Bock contains several benchmarks of public data for compressors with a command line interface As of Feb. 2009, paq8i or paq8p was top ranked by size on most of them. Metacompressor is automated benchmark that allows developers to submit programs and test files and compare size compression time, and decompression time. Xtreme Compression compares 60 compression option combinations with their own product for size and speed on a 80 GB synthetic database file. After their product, which works only on database tables, nanozip -nm -cc ranks next, followed by zpaq as of Nov. 2011. Meyer and Bolosky a study of practical deduplication, examined the contents of 857 file systems among employees from a wide range of departments 2009. The table below gives the approximate distribution by type, as compared to similar studies by them 2000 and 2004 2004 Data type 2% 13% No filename extension 13% 10% .dll 3% 8% .lib 5% .vhd 7% 7% .pdb 6% 4% .exe 4% .pch 3% 2% .cab 4% .wma 1% .iso 5% .pst 4% .mp3% .chm 49% 43% Other The average file system 2009 had a capacity of 150 GB and was 40% full. The fraction use remained nearly constant since 2000 spite of a doubling of disk capacity almost every year. Average file size also remained nearly constant at about 4 KB since 1981. However the number of files increased, to average of 225 files 36 directories 2009. File size varies widely. About half of all data is files larger than 25 MB. One fourth is files smaller than 3 MB and one fourth files larger than 1 GB. These percentiles are also increasing as the number of larger files grow. Half of all data was files larger than 1 MB 2000 and 5 MB 2004. average file system 2009 could be compressed by 22% by whole file deduplication, i.e. reduced to 78%