add thin client perf test scripts (#220)

Author: copperlight

docs/spectator/lang/go/perf-test.md

@@ -0,0 +1,48 @@
+# Performance
+
+## Test Script
+
+Test maximum single-threaded throughput for two minutes.
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/Netflix/spectator-go/v2/spectator"
+	"time"
+)
+
+func elapsed(start time.Time) float64 {
+	return time.Now().Sub(start).Seconds()
+}
+
+func main() {
+	location := "udp"
+	// location := "unix"
+	config, _ := spectator.NewConfig(location, nil, nil)
+	registry, _ := spectator.NewRegistry(config)
+	defer registry.Close()
+	// add tags with some length, to simulate more real-world conditions
+	tags := map[string]string{"location": location, "version": "correct-horse-battery-staple"}
+
+	maxDuration := float64(2 * 60)
+	start := time.Now()
+
+	fmt.Printf("start spectator-go %s benchmark\n", location)
+	iteration := 1
+	for elapsed(start) < maxDuration {
+		registry.Counter("spectator-go.publish", tags).Increment()
+		if iteration % 500000 == 0 {
+			fmt.Printf("iterations=%v elapsed=%v\n", iteration, elapsed(start))
+		}
+		iteration++
+	}
+
+	fmt.Printf("iterations=%v rate/sec=%v\n", iteration, float64(iteration) / elapsed(start))
+}
+```
+
+## Results
+
+See [Usage > Performance](usage.md#performance).

docs/spectator/lang/nodejs/perf-test.md

@@ -0,0 +1,13 @@
+# Performance
+
+## Test Script
+
+Test maximum single-threaded throughput for two minutes.
+
+```javascript
+// tbd
+```
+
+## Results
+
+See [Usage > Performance](usage.md#performance).

docs/spectator/lang/nodejs/usage.md

@@ -448,3 +448,17 @@ describe("Protocol Parser Tests", (): void => {
 ```
 
 [SpectatorD]: ../../agent/usage.md
+
+## Performance
+
+On an `m5d.2xlarge` EC2 instance, with `Node.js v22.16.0` and `nflx-spectator: ^3.0.5`, we have
+observed the following single-threaded performance numbers across a two-minute test window:
+
+* ??? requests/second over `udp`
+
+The benchmark incremented a single counter with two tags in a tight loop, to simulate real-world tag
+usage, and the rate-per-second observed on the corresponding Atlas graph matched. The protocol line
+was `74` characters in length.
+
+The Node.js process CPU usage was ~100% and the `spectatord` process CPU usage was ~55% on this 8
+vCPU system.

docs/spectator/lang/py/perf-test.md

@@ -0,0 +1,47 @@
+# Performance
+
+## Test Script
+
+Test maximum single-threaded throughput for two minutes.
+
+```python
+#!/usr/bin/env python3
+
+import logging
+import time
+
+from spectator import Config, Registry
+
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(thread)d - %(message)s'
+)
+
+location = "udp"
+# location = "unix"
+registry = Registry(Config(location))
+# add tags with some length, to simulate more real-world conditions
+tags = {"location": location, "version": "correct-horse-battery-staple"}
+
+max_duration = 2 * 60
+start = time.perf_counter()
+
+def elapsed():
+    return time.perf_counter() - start
+
+print(f"start spectator-py {location} benchmark")
+iteration = 1
+while True:
+    registry.counter("spectator-py.publish", tags).increment()
+    if iteration % 500000 == 0:
+        print(f"iterations={iteration} elapsed={elapsed():.2f}")
+        if elapsed() > max_duration:
+            break
+    iteration += 1
+
+print(f"iterations={iteration} rate/sec={iteration/elapsed():.2f}")
+```
+
+## Results
+
+See [Usage > Performance](usage.md#performance).

mkdocs.yml

@@ -242,6 +242,7 @@ nav:
         - Percentile Timer: spectator/lang/go/meters/percentile-timer.md
         - Timer: spectator/lang/go/meters/timer.md
       - Migrations: spectator/lang/go/migrations.md
+      - Performance: spectator/lang/go/perf-test.md
     - Java:
       - Usage: spectator/lang/java/usage.md
       - Registry:
@@ -283,6 +284,7 @@ nav:
         - Percentile Timer: spectator/lang/nodejs/meters/percentile-timer.md
         - Timer: spectator/lang/nodejs/meters/timer.md
       - Migrations: spectator/lang/nodejs/migrations.md
+      - Performance: spectator/lang/nodejs/perf-test.md
     - Python:
       - Usage: spectator/lang/py/usage.md
       - Meters:
@@ -297,6 +299,7 @@ nav:
         - Percentile Timer: spectator/lang/py/meters/percentile-timer.md
         - Timer: spectator/lang/py/meters/timer.md
       - Migrations: spectator/lang/py/migrations.md
+      - Performance: spectator/lang/py/perf-test.md
     - Ruby:
       - Deprecated: spectator/lang/rb/deprecated.md
   - Patterns: