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inikep / lzbench

lzbench is an in-memory benchmark of open-source LZ77/LZSS/LZMA compressors
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print decimal %.1 place for de/compression speed > 10 < 100 [MB] #108

Closed tansy closed 2 years ago

tansy commented 2 years ago

When displaying speeds > 10MB and < 100MB there is a significant error associated with it as it cuts off all fractional part of it. This error can approach 10%, for example: if there is a speed of 10.000 and 10.999 [MB] they will both be displayed as 10 when actual difference is 0.999, and an error is 9.99% ( |10.999-10.000|/10.000 = 0.0999 = 9.99% ). Similarly if those speed were 10.999 and 11.000 then they wold be displayed as 10 and 11, with a difference of 1 when actually it is 0.001. Again error would be 9.99% ( |1-0.001|/10 = 0.0999 = 9.99% ).

So I increased displayed accuracy for speeds > 10MB and < 100MB to one decimal point which reduces the error below 1%.

Here simple sample:

(from:) $ ./lzbench -o1 -ezlib,1,5,9/bzip2,1,5,9 lzbench

Compressor name Compression Decompress. Compr. size Ratio Filename
memcpy 1269 MB/s 1295 MB/s 3967061 100.00 lzbench
zlib 1.2.11 -1 19 MB/s 84 MB/s 1719310 43.34 lzbench
zlib 1.2.11 -5 10 MB/s 91 MB/s 1573155 39.66 lzbench
zlib 1.2.11 -9 2.55 MB/s 94 MB/s 1547454 39.01 lzbench
bzip2 1.0.8 -1 4.97 MB/s 13 MB/s 1516333 38.22 lzbench
bzip2 1.0.8 -5 4.87 MB/s 12 MB/s 1460530 36.82 lzbench
bzip2 1.0.8 -9 4.54 MB/s 10 MB/s 1470290 37.06 lzbench

(To:) $ ./lzbench-print_10m0 -o1 -ezlib,1,5,9/bzip2,1,5,9 lzbench

Compressor name Compression Decompress. Compr. size Ratio Filename
memcpy 1218 MB/s 1289 MB/s 3968202 100.00 lzbench
zlib 1.2.11 -1 19.5 MB/s 84.7 MB/s 1719672 43.34 lzbench
zlib 1.2.11 -5 10.4 MB/s 91.9 MB/s 1573515 39.65 lzbench
zlib 1.2.11 -9 2.55 MB/s 94.1 MB/s 1547770 39.00 lzbench
bzip2 1.0.8 -1 4.96 MB/s 13.4 MB/s 1516247 38.21 lzbench
bzip2 1.0.8 -5 4.86 MB/s 12.1 MB/s 1461230 36.82 lzbench
bzip2 1.0.8 -9 4.54 MB/s 10.9 MB/s 1472172 37.10 lzbench

Hope you find it reasonable and useful.