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[fitsbits] Rice compression from the command line
I did a simple test using bzip2 for event files on Solaris.
Sure, I got 15% savings over gzip and I'm not worried about the compression taking about twice as long. But the decompression taking an order of magnitude longer than gunzip bothers me. Even if it is more than compensated for by what's gained in transmission time, the users' perception will be that things are worse, since decompression taking 10 times as long appears far worse than what a 10% reduction in transmission has gained - even if in absolute terms there is a net gain. Granted, this is only true, of course, for situations where transmission and decompression are separate actions. - Arnold Mark Calabretta wrote: On Tue 2006/07/18 16:42:28 MST, Rob Seaman wrote in a message to: I now mostly use bzip2 (GPL, bzip.org), it usually outperforms gzip by about 10% for binary data. It's quite a bit slower, however. Of course, it does depend on the type of binary data - pure random data should not be compressible. I measured the 10% figure for the FLC animations distributed from my web site. If the files are intended for download, especially very large files, the extra time taken to compress/uncompress them is more than compensated by the faster download time. Mark Calabretta ATNF _______________________________________________ fitsbits mailing list http://listmgr.cv.nrao.edu/mailman/listinfo/fitsbits -------------------------------------------------------------------------- Arnold H. Rots Chandra X-ray Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 67 fax: +1 617 495 7356 Cambridge, MA 02138 USA http://hea-www.harvard.edu/~arots/ -------------------------------------------------------------------------- |
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