GODRIVER-3102: Perf comparison

.evergreen/config.yml

@@ -285,6 +285,16 @@ functions:
           echo "Response Body: $response_body"
           echo "HTTP Status: $http_status"
 
+  send-perf-pr-comment:
+    - command: subprocess.exec
+      type: test
+      params:
+        binary: bash
+        env:
+          VERSION_ID: ${version_id}
+        include_expansions_in_env: [PERF_URI_PRIVATE_ENDPOINT]
+        args: [*task-runner, perf-pr-comment]
+
   run-enterprise-auth-tests:
     - command: ec2.assume_role
       params:
@@ -684,6 +694,7 @@ tasks:
           binary: bash
           args: [*task-runner, driver-benchmark]
       - func: send-perf-data
+      - func: send-perf-pr-comment
 
   - name: test-standalone-noauth-nossl
     tags: ["test", "standalone"]

Taskfile.yml

@@ -70,6 +70,8 @@ tasks:
 
   pr-task: bash etc/pr-task.sh
 
+  perf-pr-comment: bash etc/perf-pr-comment.sh
+
   # Lint with various GOOS and GOARCH tasks to catch static analysis failures that may only affect
   # specific operating systems or architectures. For example, staticcheck will only check for 64-bit
   # alignment of atomically accessed variables on 32-bit architectures (see

etc/perf-pr-comment.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# perf-pr-comment
+# Generates a report of Go Driver perf changes for the current branch.
+
+set -eux
+
+pushd ./internal/cmd/perfcomp >/dev/null || exist
+GOWORK=off go run main.go --project="mongo-go-driver" ${VERSION_ID}
+popd >/dev/null

internal/cmd/perfcomp/energystatistics_test.go

@@ -0,0 +1,93 @@
+// Copyright (C) MongoDB, Inc. 2025-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"gonum.org/v1/gonum/mat"
+)
+
+func createTestVectors(start1 int, stop1 int, step1 int, start2 int, stop2 int, step2 int) (*mat.Dense, *mat.Dense) {
+	xData := []float64{}
+	yData := []float64{}
+
+	for i := start1; i < stop1; i += step1 {
+		xData = append(xData, float64(i))
+	}
+	for j := start2; j < stop2; j += step2 {
+		yData = append(yData, float64(j))
+	}
+
+	x := mat.NewDense(len(xData), 1, xData)
+	y := mat.NewDense(len(yData), 1, yData)
+
+	return x, y
+}
+
+func TestEnergyStatistics(t *testing.T) {
+
+	t.Run("similar distributions should have small e,t,h values ", func(t *testing.T) {
+		x, y := createTestVectors(1, 100, 1, 1, 105, 1)
+		e, tstat, h, _ := getEnergyStatistics(x, y)
+
+		del := 1e-3
+		// Limit precision of comparison to 3 digits after the decimal.
+		assert.InDelta(t, 0.160, e, del) // |0.160 - e| < 0.001
+		assert.InDelta(t, 8.136, tstat, del)
+		assert.InDelta(t, 0.002, h, del)
+	})
+
+	t.Run("different distributions should have large e,t,h values", func(t *testing.T) {
+		x, y := createTestVectors(1, 100, 1, 10000, 13000, 14)
+		e, tstat, h, _ := getEnergyStatistics(x, y)
+		del := 1e-3
+
+		assert.InDelta(t, 21859.691, e, del)
+		assert.InDelta(t, 1481794.709, tstat, del)
+		assert.InDelta(t, 0.954, h, del)
+	})
+
+	t.Run("uni-variate distributions", func(t *testing.T) {
+		x, y := createTestVectors(1, 300, 1, 1000, 5000, 10)
+		e, tstat, h, _ := getEnergyStatistics(x, y)
+		del := 1e-3
+
+		assert.InDelta(t, 4257.009, e, del)
+		assert.InDelta(t, 728381.015, tstat, del)
+		assert.InDelta(t, 0.748, h, del)
+	})
+
+	t.Run("equal distributions should have all 0 values", func(t *testing.T) {
+		x := mat.NewDense(10, 1, []float64{1, 1, 1, 1, 1, 1, 1, 1, 1, 1})
+		y := mat.NewDense(1, 1, []float64{1})
+
+		e, tstat, h, _ := getEnergyStatistics(x, y)
+
+		assert.Equal(t, 0.0, e)
+		assert.Equal(t, 0.0, tstat)
+		assert.Equal(t, 0.0, h)
+	})
+
+	t.Run("energy stats returns errors on malformed input", func(t *testing.T) {
+		x := mat.NewDense(2, 2, make([]float64, 4))
+		y := mat.NewDense(2, 3, make([]float64, 6))
+
+		_, _, _, err := getEnergyStatistics(x, y)
+		assert.NotEqual(t, nil, err)
+		assert.ErrorContains(t, err, "both inputs must have the same number of columns")
+
+		x = mat.NewDense(2, 2, make([]float64, 4))
+		y = mat.NewDense(3, 2, make([]float64, 6))
+
+		_, _, _, err = getEnergyStatistics(x, y)
+		assert.NotEqual(t, nil, err)
+		assert.ErrorContains(t, err, "both inputs must be column vectors")
+	})
+
+}

internal/cmd/perfcomp/go.mod

@@ -0,0 +1,28 @@
+module go.mongodb.go/mongo-driver/v2/internal/cmd/perfcomp
+
+go 1.23.0
+
+toolchain go1.23.10
+
+replace go.mongodb.org/mongo-driver/v2 => ../../../
+
+require (
+	github.com/stretchr/testify v1.10.0
+	go.mongodb.org/mongo-driver/v2 v2.2.2
+	gonum.org/v1/gonum v0.16.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/golang/snappy v1.0.0 // indirect
+	github.com/klauspost/compress v1.16.7 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.1.2 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	golang.org/x/crypto v0.33.0 // indirect
+	golang.org/x/sync v0.12.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

internal/cmd/perfcomp/go.sum

@@ -0,0 +1,56 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/golang/snappy v1.0.0 h1:Oy607GVXHs7RtbggtPBnr2RmDArIsAefDwvrdWvRhGs=
+github.com/golang/snappy v1.0.0/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/klauspost/compress v1.16.7 h1:2mk3MPGNzKyxErAw8YaohYh69+pa4sIQSC0fPGCFR9I=
+github.com/klauspost/compress v1.16.7/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
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+github.com/xdg-go/pbkdf2 v1.0.0/go.mod h1:jrpuAogTd400dnrH08LKmI/xc1MbPOebTwRqcT5RDeI=
+github.com/xdg-go/scram v1.1.2 h1:FHX5I5B4i4hKRVRBCFRxq1iQRej7WO3hhBuJf+UUySY=
+github.com/xdg-go/scram v1.1.2/go.mod h1:RT/sEzTbU5y00aCK8UOx6R7YryM0iF1N2MOmC3kKLN4=
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+github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 h1:ilQV1hzziu+LLM3zUTJ0trRztfwgjqKnBWNtSRkbmwM=
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