Add focused benchmark for metric hotpath (#1389)

Author: cijothomas

opentelemetry-sdk/Cargo.toml

@@ -61,6 +61,14 @@ harness = false
 name = "span_builder"
 harness = false
 
+[[bench]]
+name = "metric_counter"
+harness = false
+
+[[bench]]
+name = "attribute_set"
+harness = false
+
 [[bench]]
 name = "trace"
 harness = false

opentelemetry-sdk/benches/attribute_set.rs

@@ -0,0 +1,40 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use opentelemetry::KeyValue;
+use opentelemetry_sdk::AttributeSet;
+
+// Run this benchmark with:
+// cargo bench --bench metric_counter
+
+fn criterion_benchmark(c: &mut Criterion) {
+    attribute_set(c);
+}
+
+fn attribute_set(c: &mut Criterion) {
+    c.bench_function("AttributeSet_without_duplicates", |b| {
+        b.iter(|| {
+            let attributes: &[KeyValue] = &[
+                KeyValue::new("attribute1", "value1"),
+                KeyValue::new("attribute2", "value2"),
+                KeyValue::new("attribute3", "value3"),
+                KeyValue::new("attribute4", "value4"),
+            ];
+            let _attribute_set: AttributeSet = attributes.into();
+        });
+    });
+
+    c.bench_function("AttributeSet_with_duplicates", |b| {
+        b.iter(|| {
+            let attributes: &[KeyValue] = &[
+                KeyValue::new("attribute1", "value1"),
+                KeyValue::new("attribute3", "value3"),
+                KeyValue::new("attribute3", "value3"),
+                KeyValue::new("attribute4", "value4"),
+            ];
+            let _attribute_set: AttributeSet = attributes.into();
+        });
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+
+criterion_main!(benches);

opentelemetry-sdk/benches/metric_counter.rs

@@ -0,0 +1,74 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use opentelemetry::{
+    metrics::{Counter, MeterProvider as _},
+    KeyValue,
+};
+use opentelemetry_sdk::metrics::{ManualReader, SdkMeterProvider};
+use rand::{rngs::SmallRng, Rng, SeedableRng};
+
+// Run this benchmark with:
+// cargo bench --bench metric_counter --features=metrics,testing
+fn create_counter() -> Counter<u64> {
+    let meter_provider: SdkMeterProvider = SdkMeterProvider::builder()
+        .with_reader(ManualReader::builder().build())
+        .build();
+    let meter = meter_provider.meter("benchmarks");
+    let counter = meter.u64_counter("counter_bench").init();
+    counter
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    counter_add(c);
+}
+
+fn counter_add(c: &mut Criterion) {
+    let attribute_values = [
+        "value1", "value2", "value3", "value4", "value5", "value6", "value7", "value8", "value9",
+        "value10",
+    ];
+
+    let counter = create_counter();
+    c.bench_function("Counter_Add_Sorted", |b| {
+        b.iter(|| {
+            let mut rng = SmallRng::from_entropy();
+            // 4*4*10*10 = 1600 time series.
+            let index_first_attribute = rng.gen_range(0..4);
+            let index_second_attribute = rng.gen_range(0..4);
+            let index_third_attribute = rng.gen_range(0..10);
+            let index_forth_attribute = rng.gen_range(0..10);
+            counter.add(
+                1,
+                &[
+                    KeyValue::new("attribute1", attribute_values[index_first_attribute]),
+                    KeyValue::new("attribute2", attribute_values[index_second_attribute]),
+                    KeyValue::new("attribute3", attribute_values[index_third_attribute]),
+                    KeyValue::new("attribute4", attribute_values[index_forth_attribute]),
+                ],
+            );
+        });
+    });
+
+    c.bench_function("Counter_Add_Unsorted", |b| {
+        b.iter(|| {
+            let mut rng = SmallRng::from_entropy();
+            // 4*4*10*10 = 1600 time series.
+            let index_first_attribute = rng.gen_range(0..4);
+            let index_second_attribute = rng.gen_range(0..4);
+            let index_third_attribute = rng.gen_range(0..10);
+            let index_forth_attribute = rng.gen_range(0..10);
+            counter.add(
+                1,
+                &[
+                    KeyValue::new("attribute2", attribute_values[index_second_attribute]),
+                    KeyValue::new("attribute3", attribute_values[index_third_attribute]),
+                    KeyValue::new("attribute1", attribute_values[index_first_attribute]),
+                    KeyValue::new("attribute4", attribute_values[index_forth_attribute]),
+                ],
+            );
+        });
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+
+criterion_main!(benches);