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Benchmarks
These benchmarks are written using Google Benchmark.
Repetitions
To increase the number of times each benchmark iteration is run use:
--benchmark_repetitions=20
Filters
To filter out which benchmarks are performed use:
--benchmark_filter="adler32*"
There are two different benchmarks, micro and macro.
Benchmark benchmark_zlib
These are microbenchmarks intended to test lower level subfunctions of the library.
Benchmarks include implementations of: - Adler32 - CRC - 256 byte comparisons - SIMD accelerated "slide hash" routine
By default these benchmarks report things on the nanosecond scale and are small enough to measure very minute differences.
Benchmark benchmark_zlib_apps
These benchmarks measure applications of zlib as a whole. Currently the only examples are PNG encoding and decoding. The PNG encode and decode tests leveraging procedurally generated and highly compressible image data.
Additionally, a test called png_decode_realistic that will decode any RGB 8 BPP encoded
set of PNGs in the working directory under a directory named "test_pngs" with files named
{0..1}.png. If these images do not exist, they will error out and the benchmark will move
on to the next set of benchmarks.
benchmark_zlib_apps_alt
The user can compile a comparison benchmark application linking to any zlib-compatible implementation of his or her choosing.