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A very rough and ready, impromptu benchmark.

zlib latest took 26 seconds to compress 648 MB of text, zlib-ng latest took 16 seconds.

    alex@martha:~/src/zlib$ export TESTFILE=../enwiki-20141106-pages-articles-multistream-index.txt
    alex@martha:~/src/zlib$ du -h $TESTFILE
    648M	/home/alex/src/enwiki-20141106-pages-articles-multistream-index.txt
    alex@martha:~/src/zlib$ LD_LIBRARY_PATH=./ time ./minigzip <$TESTFILE >/dev/null
    23.75user 0.17system 0:26.05elapsed 91%CPU (0avgtext+0avgdata 1864maxresident)k
    56472inputs+0outputs (0major+144minor)pagefaults 0swaps
    alex@martha:~/src/zlib$ LD_LIBRARY_PATH=./ time ./minigzip <$TESTFILE >/dev/null
    24.29user 0.17system 0:26.80elapsed 91%CPU (0avgtext+0avgdata 1772maxresident)k
    0inputs+0outputs (0major+141minor)pagefaults 0swaps
    alex@martha:~/src/zlib$ cd ../zlib-ng
    alex@martha:~/src/zlib-ng$ LD_LIBRARY_PATH=./ time ./minigzip <$TESTFILE >/dev/null
    14.66user 0.11system 0:16.16elapsed 91%CPU (0avgtext+0avgdata 1604maxresident)k
    256inputs+0outputs (0major+140minor)pagefaults 0swaps
    alex@martha:~/src/zlib-ng$ LD_LIBRARY_PATH=./ time ./minigzip <$TESTFILE >/dev/null
    14.64user 0.12system 0:16.09elapsed 91%CPU (0avgtext+0avgdata 1840maxresident)k
    0inputs+0outputs (0major+144minor)pagefaults 0swaps

The machine is a MBP 11,2 with an i7-4750HQ CPU @ 2.00GHz, running Ubuntu 15.04 x64.

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alex@martha:~/src/zlib$ du -sh $TESTFILE 197M /home/alex/src/enwiki-20141106-pages-articles-multistream-index.txt.gz alex@martha:~/src/zlib$ LD_LIBRARY_PATH=./ time ./minigzip -d <$TESTFILE >/dev/null 3.36user 0.03system 0:03.87elapsed 87%CPU (0avgtext+0avgdata 1632maxresident)k 8inputs+0outputs (0major+90minor)pagefaults 0swaps alex@martha:~/src/zlib$ LD_LIBRARY_PATH=./ time ./minigzip -d <$TESTFILE >/dev/null 3.34user 0.04system 0:03.76elapsed 90%CPU (0avgtext+0avgdata 1704maxresident)k 0inputs+0outputs (0major+91minor)pagefaults 0swaps alex@martha:~/src/zlib$ cd ../zlib-ng/ alex@martha:~/src/zlib-ng$ LD_LIBRARY_PATH=./ time ./minigzip -d <$TESTFILE >/dev/null 12.20user 0.04system 0:13.63elapsed 89%CPU (0avgtext+0avgdata 1576maxresident)k 264inputs+0outputs (1major+86minor)pagefaults 0swaps alex@martha:~/src/zlib-ng$ LD_LIBRARY_PATH=./ time ./minigzip -d <$TESTFILE >/dev/null 12.15user 0.08system 0:13.58elapsed 90%CPU (0avgtext+0avgdata 1428maxresident)k 0inputs+0outputs (0major+84minor)pagefaults 0swaps