• Nigel Tao's avatar
    compress/testdata: change {e,pi}.txt from 10k to 100k digits. · 738e77aa
    Nigel Tao authored
    These files change from exactly 10003 bytes long to 100003: a digit,
    a '.', 100k digits, and a '\n'.
    
    The magic constants in compress/flate/deflate_test.go change since
    deflateInflateStringTests checks that the compressed form of e.txt
    is not 'too large'. I'm not exactly sure how these numbers were
    originally calculated (they were introduced in codereview 5554066
    "make lazy matching work"); perhaps krasin@golang.org can comment.
    My change was to increase the first one (no compression) to a tight
    bound, and multiply all the others by 10.
    
    Benchcmp numbers for compress/flate and compress/lzw below. LZW's
    window size of 4096 is less than 10k, so shows no significant change.
    Flate's window size is 32768, between 10k and 100k, and so the .*1e5
    and .*1e6 benchmarks show a dramatic drop, since the compressed forms
    are no longer a trivial forward copy of 10k digits repeated over and
    over, but should now be more representative of real world usage.
    
    compress/flate:
    benchmark                            old MB/s     new MB/s  speedup
    BenchmarkDecodeDigitsSpeed1e4           16.58        16.52    1.00x
    BenchmarkDecodeDigitsSpeed1e5           68.09        18.10    0.27x
    BenchmarkDecodeDigitsSpeed1e6          124.63        18.35    0.15x
    BenchmarkDecodeDigitsDefault1e4         17.21        17.12    0.99x
    BenchmarkDecodeDigitsDefault1e5        118.28        19.19    0.16x
    BenchmarkDecodeDigitsDefault1e6        295.62        20.52    0.07x
    BenchmarkDecodeDigitsCompress1e4        17.22        17.17    1.00x
    BenchmarkDecodeDigitsCompress1e5       118.19        19.21    0.16x
    BenchmarkDecodeDigitsCompress1e6       295.59        20.55    0.07x
    BenchmarkEncodeDigitsSpeed1e4            8.18         8.19    1.00x
    BenchmarkEncodeDigitsSpeed1e5           43.22        12.84    0.30x
    BenchmarkEncodeDigitsSpeed1e6           80.76        13.48    0.17x
    BenchmarkEncodeDigitsDefault1e4          6.29         6.19    0.98x
    BenchmarkEncodeDigitsDefault1e5         31.63         3.60    0.11x
    BenchmarkEncodeDigitsDefault1e6         52.97         3.24    0.06x
    BenchmarkEncodeDigitsCompress1e4         6.20         6.19    1.00x
    BenchmarkEncodeDigitsCompress1e5        31.59         3.59    0.11x
    BenchmarkEncodeDigitsCompress1e6        53.18         3.25    0.06x
    
    compress/lzw:
    benchmark               old MB/s     new MB/s  speedup
    BenchmarkDecoder1e4        21.99        22.09    1.00x
    BenchmarkDecoder1e5        22.77        22.71    1.00x
    BenchmarkDecoder1e6        22.90        22.90    1.00x
    BenchmarkEncoder1e4        21.04        21.19    1.01x
    BenchmarkEncoder1e5        22.06        22.06    1.00x
    BenchmarkEncoder1e6        22.16        22.28    1.01x
    
    R=rsc
    CC=golang-dev, krasin
    https://golang.org/cl/6207043
    738e77aa
e.txt 97.7 KB