> On 7 Jan 2008, at 19:28, Benjamin M. Schwartz wrote: > >> Nonetheless, I decided to benchmark the compressors on >> http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build1513/ >> devel_jffs2/xo-1-olpc-stream-joyride-build-1513-20080105_1602- >> devel_jffs2-tree.tar.bz2 >> >> Results: >> Uncompressed 732M >> LZO -1 (fast) 345M >> LZO -9 (slow) 298M >> Gzip (defaults) 269M >> Bzip2 (as downloaded) 236M >> >> Note that fast vs. slow refers to compression speed. >> Decompression is >> the same speed in either case. >> >> These tests were run on the whole tar-file. As noted by Bernie, the >> differences would likely be smaller on 4KB blocks. > > I had some notes, which I can't now find, for a real-time sample > logger we built... > Anyway, we did some tests compressing small blocks, and I am sure > we saw much less of a difference than Benjamin saw on his big block. > Also, I'm pretty sure bzip2 fared very badly in our test, the small > blocks didn't suit it at all (and it was slower, of course.) > Of course, the statistics of our sample data was probably not > representative, so YMMV... > > >
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