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Zipmt is a command line utility that speeds up bzip2 compression by dividing the file into multiple parts and compressing them independently in separate threads and then combining them back into a single .bz2 file. It depends on glib and libbz2 and is written in C. Features:Compresses files much faster then bzip2 with similar compression rates. Uses multiple threads for multi-CPU efficiency gains. Handy -v (verbose) mode lets you see progress per thread. Can compress large (> 2GB) files. Can compress from an input stream for pipeline processing. Limitations:Can not decompress (use bunzip2 for that). Performance:See for yourself. It's easy to see the difference on a large file: /home/drusifer> ls -lh bigfile.txt -rw-r--r-- 1 drusifer drusifer 783M Mar 23 14:09 bigfile.txtFirst I'll use bzip2 to compress it: /home/drusifer> time bzip2 bigfile.txt 477.820u 1.080s 8:06.11 98.5% 0+0k 0+0io 102pf+0w /home/drusifer> ls -lh bigfile.txt.bz2 -rw-r--r-- 1 drusifer drusifer 59M Mar 23 14:09 bigfile.txt.bz2That took just over eight minutes and compressed my file to 59M. Now I'll try zipmt. My machine has four CPUs so I'll tell it to use four threads via the -t option: /home/drusifer> time zipmt -t 4 bigfile.txt.bz2 0.000u 0.400s 1:57.27 0.3% 0+0k 0+0io 152pf+0w /home/drusifer> ls -lh bigfile.txt.bz2 -rw-r--r-- 1 drusifer drusifer 59M Mar 23 14:26 bigfile.txt.bz2Zipmt only took two minutes and achieved the same compression ratio as bzip2! It's four times faster then regular bzip2 because it's using four CPUs instead of just one!

multi-threaded compression zip c bzip


Snes9x for OSThis is a full featured port of Snes9x to Mac OS X. It aims to support all the features you would want in a modern emulator like video filtering, full screen, gamepad support, save states, and more. It also aims to be very modular. The BaseEmulation protocol/bundle makes it easy to port other emulators. Working Screenshots Save states Auto save states Loading from ZIP, GZIP, BZIP, or uncompressed files Keyboard controls SIXAXIS controls Full screen Turbo Todo Customizable controls More video filters Battery saving Xbox360 pad support Crash running Star Ocean English Translation


bzip2 is a freely available, patent free, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.

posix compression