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    <title>Pinboard (jm)</title>
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  </channel><item rdf:about="https://en.wikipedia.org/wiki/Burrows%E2%80%93Wheeler_transform">
    <title>Burrows–Wheeler Transform</title>
    <dc:date>2025-02-04T11:04:34+00:00</dc:date>
    <link>https://en.wikipedia.org/wiki/Burrows%E2%80%93Wheeler_transform</link>
    <dc:creator>jm</dc:creator><description><![CDATA[an algorithm used to prepare data for use with data compression techniques such as bzip2. It permutes the order of characters in a string (S), sorting all the circular shifts of the text in lexicographic order, then extracting the last column and the index of the original string in the set of sorted permutations of S.

Some day when I have lots of free time to spare, I'll spend a while getting my head around this deep magic, because it's just amazing that this works.

(via John Regehr)]]></description>
<dc:subject>compression algorithms burrows-wheeler-transform bzip2 via:john-regehr magic text</dc:subject>
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<dc:identifier>https://pinboard.in/u:jm/b:67cbf2004350/</dc:identifier>
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    <title>lbzip2</title>
    <dc:date>2016-03-08T12:03:43+00:00</dc:date>
    <link>http://lbzip2.org/</link>
    <dc:creator>jm</dc:creator><description><![CDATA[<blockquote>a free, multi-threaded compression utility with support for bzip2 compressed file format.  lbzip2 can process standard bz2 files in parallel. It uses POSIX threading model (pthreads), which allows it to take full advantage of symmetric multiprocessing (SMP) systems. It has been proven to scale linearly, even to over one hundred processor cores.

lbzip2 is fully compatible with bzip2 – both at file format and command line level. Files created by lbzip2 can be decompressed by all versions of bzip2 and other software supporting bz2 format. lbzip2 can decompress any bz2 files in parallel. All bzip2 command-line options are also accepted by lbzip2. This makes lbzip2 a drop-in replacement for bzip2.</blockquote>

]]></description>
<dc:subject>bzip2 gzip compression lbzip2 parallel cli tools</dc:subject>
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<dc:identifier>https://pinboard.in/u:jm/b:4ee959464701/</dc:identifier>
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<item rdf:about="https://wiki.archlinux.org/index.php/Lrzip">
    <title>lrzip</title>
    <dc:date>2012-02-07T17:31:53+00:00</dc:date>
    <link>https://wiki.archlinux.org/index.php/Lrzip</link>
    <dc:creator>jm</dc:creator><description><![CDATA['Lrzip uses an extended version of rzip which does a first pass long distance redundancy reduction. The lrzip modifications make it scale according to memory size. [...] The unique feature of lrzip is that it tries to make the most of the available ram in your system at all times for maximum benefit. It does this by default, choosing the largest sized window possible without running out of memory.']]></description>
<dc:subject>zip compression via:dakami gzip bzip2 archiving benchmarks</dc:subject>
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<dc:identifier>https://pinboard.in/u:jm/b:1981f4f7ea0d/</dc:identifier>
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