Add basic stress test for tracing (open-telemetry#1286)

Author: cijothomas

throughput.rs

@@ -27,7 +27,7 @@ where
     })
     .expect("Error setting Ctrl-C handler");
     let num_threads = num_cpus::get_physical();
-    println!("Number threads: {}", num_threads);
+    println!("Number of threads: {}", num_threads);
     let mut handles = Vec::with_capacity(num_threads);
     let func_arc = Arc::new(func);
     let mut worker_stats_vec: Vec<WorkerStats> = Vec::new();

traces.rs

@@ -0,0 +1,31 @@
+use lazy_static::lazy_static;
+use opentelemetry::{
+    trace::{Span, SpanBuilder, Tracer, TracerProvider as _},
+    KeyValue,
+};
+use opentelemetry_sdk::trace as sdktrace;
+
+mod throughput;
+
+lazy_static! {
+    static ref PROVIDER: sdktrace::TracerProvider = sdktrace::TracerProvider::builder()
+        .with_config(sdktrace::config().with_sampler(sdktrace::Sampler::AlwaysOn))
+        .build();
+    static ref TRACER: sdktrace::Tracer = PROVIDER.tracer("stress");
+}
+
+fn main() {
+    throughput::test_throughput(test_span);
+}
+
+fn test_span() {
+    let span_builder = SpanBuilder::from_name("test_span").with_attributes(vec![
+        KeyValue::new("attribute_at_span_start1", "value1"),
+        KeyValue::new("attribute_at_span_start2", "value2"),
+    ]);
+
+    let mut span = TRACER.build(span_builder);
+    span.set_attribute(KeyValue::new("key3", "value3"));
+    span.set_attribute(KeyValue::new("key4", "value4"));
+    span.end();
+}