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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package prometheus
import (
"context"
"fmt"
"testing"
"github.com/prometheus/client_golang/prometheus"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel/sdk/metric"
)
func benchmarkCollect(b *testing.B, n int) {
ctx := context.Background()
registry := prometheus.NewRegistry()
exporter, err := New(WithRegisterer(registry))
require.NoError(b, err)
provider := metric.NewMeterProvider(metric.WithReader(exporter))
meter := provider.Meter("testmeter")
for i := 0; i < n; i++ {
counter, err := meter.Float64Counter(fmt.Sprintf("foo_%d", i))
require.NoError(b, err)
counter.Add(ctx, float64(i))
}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := registry.Gather()
require.NoError(b, err)
}
}
func BenchmarkCollect1(b *testing.B) { benchmarkCollect(b, 1) }
func BenchmarkCollect10(b *testing.B) { benchmarkCollect(b, 10) }
func BenchmarkCollect100(b *testing.B) { benchmarkCollect(b, 100) }
func BenchmarkCollect1000(b *testing.B) { benchmarkCollect(b, 1000) }
func BenchmarkCollect10000(b *testing.B) { benchmarkCollect(b, 10000) }
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