add benchmarks (#69)

.gitignore

@@ -2,13 +2,13 @@
 *.jl.*.cov
 *.jl.mem
 /Manifest.toml
-/deps/build.log
-/deps/deps.jl
-/deps/usr/
 src/libzstd/LibTemplate.jl
 src/libzstd/ctypes.jl
 /github/
 settings.json
+**/*.json
+**/*.json.tmp
+benchmark/Manifest.toml
 dictionary
 github_users_sample_set.tar
 github_users_sample_set.tar.zst

benchmark/Project.toml

@@ -0,0 +1,6 @@
+[deps]
+BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
+CodecZstd = "6b39b394-51ab-5f42-8807-6242bab2b4c2"
+PkgBenchmark = "32113eaa-f34f-5b0d-bd6c-c81e245fc73d"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"

benchmark/README.md

@@ -0,0 +1,11 @@
+# CodecZstd.jl benchmarks
+
+This directory contains benchmarks for CodecZstd. To run all the
+benchmarks, launch `julia --project=benchmark` and enter:
+
+``` julia
+using PkgBenchmark
+import CodecZstd
+
+benchmarkpkg(CodecZstd)
+```

benchmark/benchmarks.jl

@@ -0,0 +1,32 @@
+using BenchmarkTools
+using Random
+using TranscodingStreams
+using CodecZstd
+
+const SUITE = BenchmarkGroup()
+cbench = SUITE["compression"] = BenchmarkGroup()
+dbench = SUITE["decompression"] = BenchmarkGroup()
+
+ccodec = ZstdCompressor()
+dcodec = ZstdDecompressor()
+TranscodingStreams.initialize(ccodec)
+TranscodingStreams.initialize(dcodec)
+
+for N in [100, 100000, 1000000]
+    u1 = rand(Xoshiro(1234), UInt8, N)
+    c1 = transcode(ZstdCompressor, u1)
+    cbench["uncompressible"][N] = @benchmarkable transcode($ccodec, $u1)
+    dbench["uncompressible"][N] = @benchmarkable transcode($dcodec, $c1)
+
+    u2 = rand(Xoshiro(1234), 0x00:0x01, N)
+    c2 = transcode(ZstdCompressor, u2)
+    cbench["compressible-bytes"][N] = @benchmarkable transcode($ccodec, $u2)
+    dbench["compressible-bytes"][N] = @benchmarkable transcode($dcodec, $c2)
+
+    f = round.(randn(Xoshiro(1234), N); base=2, digits=7)
+    # byte shuffle
+    u3 = vec(permutedims(reinterpret(reshape, UInt8, f),(2,1)))
+    c3 = transcode(ZstdCompressor, u3)
+    cbench["byteshuffle"][N] = @benchmarkable transcode($ccodec, $u3)
+    dbench["byteshuffle"][N] = @benchmarkable transcode($dcodec, $c3)
+end