fix: Address PR comments
- Clarify meaning of `b.N`. - Nix verbose flag in run example.
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jidicula
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80a69a8974
commit
690eb8a1ac
@ -67,10 +67,13 @@ func TestIntMinTableDriven(t *testing.T) {
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}
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}
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// Benchmark tests typically go in `_test.go` files and begin with `Benchmark`.
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// Each benchmark function is run several times, with `b.N` increasing on each
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// run until the `testing` runner deems the benchmark to be accurate.
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// Benchmark tests typically go in `_test.go` files and are
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// named beginning with `Benchmark`. The `testing` runner
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// executes each benchmark function several times, increasing
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// `b.N` on each run until it collects a precise measurement.
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func BenchmarkIntMin(b *testing.B) {
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// To measure a benchmark, the `testing` runner calls the
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// function in a loop `b.N` times.
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for i := 0; i < b.N; i++ {
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IntMin(1, 2)
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}
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@ -20,25 +20,10 @@ ok examples/testing 0.023s
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# Run all benchmarks in the current project in verbose
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# mode. All tests are run prior to benchmarks. The `bench`
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# flag receives a regex for benchmark function names.
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$ go test -v -bench=.
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=== RUN TestIntMinBasic
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--- PASS: TestIntMinBasic (0.00s)
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=== RUN TestIntMinTableDriven
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=== RUN TestIntMinTableDriven/0,1
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=== RUN TestIntMinTableDriven/1,0
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=== RUN TestIntMinTableDriven/2,-2
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=== RUN TestIntMinTableDriven/0,-1
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=== RUN TestIntMinTableDriven/-1,0
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--- PASS: TestIntMinTableDriven (0.00s)
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--- PASS: TestIntMinTableDriven/0,1 (0.00s)
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--- PASS: TestIntMinTableDriven/1,0 (0.00s)
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--- PASS: TestIntMinTableDriven/2,-2 (0.00s)
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--- PASS: TestIntMinTableDriven/0,-1 (0.00s)
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--- PASS: TestIntMinTableDriven/-1,0 (0.00s)
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$ go test -bench=.
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goos: darwin
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goarch: arm64
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pkg: examples/testing
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BenchmarkIntMin
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BenchmarkIntMin-8 1000000000 0.3136 ns/op
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PASS
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ok examples/testing 0.351s
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@ -1,2 +1,2 @@
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c3489e12554d4b865ae225bc8bad2d9e634fe429
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Ct1lKa6FttL
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d3b047089cf762a8aa9778a8365a29eb31363288
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HryvnW3zHYJ
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45
public/testing
generated
45
public/testing
generated
@ -47,7 +47,7 @@ typically lives in the same package as the code it tests.</p>
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</td>
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<td class="code leading">
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<a href="http://play.golang.org/p/Ct1lKa6FttL"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<a href="http://play.golang.org/p/HryvnW3zHYJ"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<pre class="chroma">
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<span class="kn">package</span> <span class="nx">main</span>
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</pre>
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@ -184,15 +184,29 @@ when executing <code>go test -v</code>.</p>
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<tr>
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<td class="docs">
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<p>Benchmark tests typically go in <code>_test.go</code> files and begin with <code>Benchmark</code>.
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Each benchmark function is run several times, with <code>b.N</code> increasing on each
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run until the <code>testing</code> runner deems the benchmark to be accurate.</p>
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<p>Benchmark tests typically go in <code>_test.go</code> files and are
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named beginning with <code>Benchmark</code>. The <code>testing</code> runner
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executes each benchmark function several times, increasing
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<code>b.N</code> on each run until it collects a precise measurement.</p>
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</td>
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<td class="code leading">
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<pre class="chroma">
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<span class="kd">func</span> <span class="nf">BenchmarkIntMin</span><span class="p">(</span><span class="nx">b</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">B</span><span class="p">)</span> <span class="p">{</span>
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</pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>To measure a benchmark, the <code>testing</code> runner calls the
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function in a loop <code>b.N</code> times.</p>
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</td>
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<td class="code">
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<pre class="chroma">
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<span class="kd">func</span> <span class="nf">BenchmarkIntMin</span><span class="p">(</span><span class="nx">b</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">B</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">for</span> <span class="nx">i</span> <span class="o">:=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="p"><</span> <span class="nx">b</span><span class="p">.</span><span class="nx">N</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span> <span class="p">{</span>
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<span class="nf">IntMin</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
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<span class="p">}</span>
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@ -243,25 +257,10 @@ flag receives a regex for benchmark function names.</p>
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<td class="code">
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<pre class="chroma">
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<span class="gp">$</span> go test -v -bench=.
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<span class="go">=== RUN TestIntMinBasic
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</span><span class="go">--- PASS: TestIntMinBasic (0.00s)
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</span><span class="go">=== RUN TestIntMinTableDriven
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</span><span class="go">=== RUN TestIntMinTableDriven/0,1
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</span><span class="go">=== RUN TestIntMinTableDriven/1,0
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</span><span class="go">=== RUN TestIntMinTableDriven/2,-2
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</span><span class="go">=== RUN TestIntMinTableDriven/0,-1
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</span><span class="go">=== RUN TestIntMinTableDriven/-1,0
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</span><span class="go">--- PASS: TestIntMinTableDriven (0.00s)
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</span><span class="go"> --- PASS: TestIntMinTableDriven/0,1 (0.00s)
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</span><span class="go"> --- PASS: TestIntMinTableDriven/1,0 (0.00s)
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</span><span class="go"> --- PASS: TestIntMinTableDriven/2,-2 (0.00s)
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</span><span class="go"> --- PASS: TestIntMinTableDriven/0,-1 (0.00s)
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</span><span class="go"> --- PASS: TestIntMinTableDriven/-1,0 (0.00s)
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</span><span class="go">goos: darwin
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<span class="gp">$</span> go test -bench=.
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<span class="go">goos: darwin
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</span><span class="go">goarch: arm64
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</span><span class="go">pkg: examples/testing
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</span><span class="go">BenchmarkIntMin
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</span><span class="go">BenchmarkIntMin-8 1000000000 0.3136 ns/op
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</span><span class="go">PASS
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</span><span class="go">ok examples/testing 0.351s</span></pre>
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@ -283,7 +282,7 @@ flag receives a regex for benchmark function names.</p>
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</div>
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<script>
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var codeLines = [];
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"testing\"\u000A)\u000A');codeLines.push('func IntMin(a, b int) int {\u000A if a \u003C b {\u000A return a\u000A }\u000A return b\u000A}\u000A');codeLines.push('func TestIntMinBasic(t *testing.T) {\u000A ans :\u003D IntMin(2, -2)\u000A if ans !\u003D -2 {\u000A');codeLines.push(' t.Errorf(\"IntMin(2, -2) \u003D %d; want -2\", ans)\u000A }\u000A}\u000A');codeLines.push('func TestIntMinTableDriven(t *testing.T) {\u000A var tests \u003D []struct {\u000A a, b int\u000A want int\u000A }{\u000A {0, 1, 0},\u000A {1, 0, 0},\u000A {2, -2, -2},\u000A {0, -1, -1},\u000A {-1, 0, -1},\u000A }\u000A');codeLines.push(' for _, tt :\u003D range tests {\u000A');codeLines.push(' testname :\u003D fmt.Sprintf(\"%d,%d\", tt.a, tt.b)\u000A t.Run(testname, func(t *testing.T) {\u000A ans :\u003D IntMin(tt.a, tt.b)\u000A if ans !\u003D tt.want {\u000A t.Errorf(\"got %d, want %d\", ans, tt.want)\u000A }\u000A })\u000A }\u000A}\u000A');codeLines.push('func BenchmarkIntMin(b *testing.B) {\u000A for i :\u003D 0; i \u003C b.N; i++ {\u000A IntMin(1, 2)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"testing\"\u000A)\u000A');codeLines.push('func IntMin(a, b int) int {\u000A if a \u003C b {\u000A return a\u000A }\u000A return b\u000A}\u000A');codeLines.push('func TestIntMinBasic(t *testing.T) {\u000A ans :\u003D IntMin(2, -2)\u000A if ans !\u003D -2 {\u000A');codeLines.push(' t.Errorf(\"IntMin(2, -2) \u003D %d; want -2\", ans)\u000A }\u000A}\u000A');codeLines.push('func TestIntMinTableDriven(t *testing.T) {\u000A var tests \u003D []struct {\u000A a, b int\u000A want int\u000A }{\u000A {0, 1, 0},\u000A {1, 0, 0},\u000A {2, -2, -2},\u000A {0, -1, -1},\u000A {-1, 0, -1},\u000A }\u000A');codeLines.push(' for _, tt :\u003D range tests {\u000A');codeLines.push(' testname :\u003D fmt.Sprintf(\"%d,%d\", tt.a, tt.b)\u000A t.Run(testname, func(t *testing.T) {\u000A ans :\u003D IntMin(tt.a, tt.b)\u000A if ans !\u003D tt.want {\u000A t.Errorf(\"got %d, want %d\", ans, tt.want)\u000A }\u000A })\u000A }\u000A}\u000A');codeLines.push('func BenchmarkIntMin(b *testing.B) {\u000A');codeLines.push(' for i :\u003D 0; i \u003C b.N; i++ {\u000A IntMin(1, 2)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
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</script>
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<script src="site.js" async></script>
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</body>
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