Minimal benchmark setup (#736)

Author: tkf

.gitignore

@@ -2,4 +2,5 @@
 *.jl.*.cov
 *.jl.mem
 /Manifest.toml
+/benchmark/Manifest.toml
 /docs/Manifest.toml

benchmark/Project.toml

@@ -0,0 +1,4 @@
+[deps]
+BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+PkgBenchmark = "32113eaa-f34f-5b0d-bd6c-c81e245fc73d"

benchmark/bench_qr.jl

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+module BenchQR
+
+using BenchmarkTools
+using LinearAlgebra
+using StaticArrays
+
+suite = BenchmarkGroup()
+
+for K = 1:22
+    a = rand(SMatrix{K,K,Float64,K*K})
+    m = Matrix(a)
+    s = suite["S=$K"] = BenchmarkGroup()
+    s["SMatrix"] = @benchmarkable qr($a)
+    s["Matrix"] = @benchmarkable qr($m)
+end
+
+end  # module
+BenchQR.suite

benchmark/benchmarks.jl

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+# Each file of the form "bench_$(name).jl" in this directory is `include`d and
+# its last statement is assumed to be a `BenchmarkGroup`.  This group is added
+# to the top-level group `SUITE` with the `$name` extracted from the file name.
+
+using BenchmarkTools
+SUITE = BenchmarkGroup()
+for file in sort(readdir(@__DIR__))
+    if startswith(file, "bench_") && endswith(file, ".jl")
+        SUITE[chop(file, head = length("bench_"), tail = length(".jl"))] =
+            include(file)
+    end
+end