Compare benchmarks

go.mod

@@ -7,7 +7,8 @@ require (
 	github.com/spf13/cobra v0.0.5
 	github.com/stretchr/testify v1.4.0
 	go.uber.org/goleak v1.0.0
-	golang.org/x/net v0.0.0-20190620200207-3b0461eec859
+	golang.org/x/net v0.0.0-20190628185345-da137c7871d7
+	golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03
 	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
 	gopkg.in/yaml.v2 v2.2.8
 )

go.sum

@@ -1,4 +1,8 @@
+cloud.google.com/go v0.0.0-20170206221025-ce650573d812/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/GoogleCloudPlatform/cloudsql-proxy v0.0.0-20190129172621-c8b1d7a94ddf/go.mod h1:aJ4qN3TfrelA6NZ6AXsXRfmEVaYin3EDbSPJrKS8OXo=
+github.com/aclements/go-gg v0.0.0-20170118225347-6dbb4e4fefb0/go.mod h1:55qNq4vcpkIuHowELi5C8e+1yUHtoLoOUR9QU5j7Tes=
+github.com/aclements/go-moremath v0.0.0-20161014184102-0ff62e0875ff/go.mod h1:idZL3yvz4kzx1dsBOAC+oYv6L92P1oFEhUXUB1A/lwQ=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
@@ -10,6 +14,14 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/go-resty/resty/v2 v2.1.0 h1:Z6IefCpUMfnvItVJaJXWv/pMiiD11So35QgwEELsldE=
 github.com/go-resty/resty/v2 v2.1.0/go.mod h1:dZGr0i9PLlaaTD4H/hoZIDjQ+r6xq8mgbRzHZf7f2J8=
+github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/gonum/blas v0.0.0-20181208220705-f22b278b28ac/go.mod h1:P32wAyui1PQ58Oce/KYkOqQv8cVw1zAapXOl+dRFGbc=
+github.com/gonum/floats v0.0.0-20181209220543-c233463c7e82/go.mod h1:PxC8OnwL11+aosOB5+iEPoV3picfs8tUpkVd0pDo+Kg=
+github.com/gonum/internal v0.0.0-20181124074243-f884aa714029/go.mod h1:Pu4dmpkhSyOzRwuXkOgAvijx4o+4YMUJJo9OvPYMkks=
+github.com/gonum/lapack v0.0.0-20181123203213-e4cdc5a0bff9/go.mod h1:XA3DeT6rxh2EAE789SSiSJNqxPaC0aE9J8NTOI0Jo/A=
+github.com/gonum/matrix v0.0.0-20181209220409-c518dec07be9/go.mod h1:0EXg4mc1CNP0HCqCz+K4ts155PXIlUywf0wqN+GfPZw=
+github.com/googleapis/gax-go v0.0.0-20161107002406-da06d194a00e/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
@@ -19,6 +31,7 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/mattn/go-sqlite3 v0.0.0-20161215041557-2d44decb4941/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
@@ -48,12 +61,17 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7 h1:rTIdg5QFRR7XCaK4LCjBiPbx8j4DQRpdYMnGn/bJUEU=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/oauth2 v0.0.0-20170207211851-4464e7848382/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
+golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03 h1:KBM1Z6efANgwwa1Rns+b3KRyuKhLRVC/OeHhFMFJqOA=
+golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03/go.mod h1:FrqOtQDO3iMDVUtw5nNTDFpR1HUCGh00M3kj2wiSzLQ=
+golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -67,6 +85,9 @@ golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825/go.mod h1:TB2adYChydJhpapK
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/api v0.0.0-20170206182103-3d017632ea10/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/grpc v0.0.0-20170208002647-2a6bf6142e96/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=

tools/testtool/commands/test_submission.go

@@ -1,6 +1,7 @@
 package commands
 
 import (
+	"bytes"
 	"crypto/rand"
 	"encoding/hex"
 	"encoding/json"
@@ -14,6 +15,7 @@ import (
 	"strings"
 
 	"github.com/spf13/cobra"
+	"golang.org/x/perf/benchstat"
 
 	"gitlab.com/slon/shad-go/tools/testtool"
 )
@@ -124,14 +126,17 @@ func testSubmission(studentRepo, privateRepo, problem string) error {
 	log.Printf("copying go.mod, go.sum and .golangci.yml")
 	copyFiles(privateRepo, []string{"go.mod", "go.sum", ".golangci.yml"}, tmpRepo)
 
+	log.Printf("running tests")
+	if err := runTests(tmpRepo, privateRepo, problem); err != nil {
+		return err
+	}
+
 	log.Printf("running linter")
 	if err := runLinter(tmpRepo, problem); err != nil {
 		return err
 	}
 
-	// Run tests.
+	return nil
-	log.Printf("running tests")
-	return runTests(tmpRepo, problem)
 }
 
 // copyDir recursively copies src directory to dst.
@@ -204,7 +209,7 @@ func runLinter(testDir, problem string) error {
 }
 
 // runTests runs all tests in directory with race detector.
-func runTests(testDir, problem string) error {
+func runTests(testDir, privateRepo, problem string) error {
 	binCache, err := ioutil.TempDir("/tmp", "bincache")
 	if err != nil {
 		log.Fatal(err)
@@ -250,20 +255,89 @@ func runTests(testDir, problem string) error {
 	for testPkg, testBinary := range testBinaries {
 		relPath := strings.TrimPrefix(testPkg, moduleImportPath)
 
-		cmd := exec.Command(testBinary)
+		{
-		if currentUserIsRoot() {
+			cmd := exec.Command(testBinary)
-			if err := sandbox(cmd); err != nil {
+			if currentUserIsRoot() {
-				log.Fatal(err)
+				if err := sandbox(cmd); err != nil {
+					log.Fatal(err)
+				}
+			}
+
+			cmd.Dir = filepath.Join(testDir, relPath)
+			cmd.Env = []string{testtool.BinariesEnv + "=" + string(binariesJSON)}
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+
+			if err := cmd.Run(); err != nil {
+				return &TestFailedError{E: err}
 			}
 		}
 
-		cmd.Dir = filepath.Join(testDir, relPath)
+		{
-		cmd.Env = []string{testtool.BinariesEnv + "=" + string(binariesJSON)}
+			benchCmd := exec.Command(testBinary, "-test.bench=.", "-test.run=^$")
-		cmd.Stdout = os.Stdout
+			if currentUserIsRoot() {
-		cmd.Stderr = os.Stderr
+				if err := sandbox(benchCmd); err != nil {
+					log.Fatal(err)
+				}
+			}
 
-		if err := cmd.Run(); err != nil {
+			var buf bytes.Buffer
-			return &TestFailedError{E: err}
+
+			benchCmd.Dir = filepath.Join(testDir, relPath)
+			benchCmd.Env = []string{testtool.BinariesEnv + "=" + string(binariesJSON)}
+			benchCmd.Stdout = &buf
+			benchCmd.Stderr = os.Stderr
+
+			if err := benchCmd.Run(); err != nil {
+				return &TestFailedError{E: err}
+			}
+
+			if strings.Contains(buf.String(), "no tests to run") {
+				continue
+			}
+
+			if err := compareToBaseline(testPkg, privateRepo, buf.Bytes()); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func noMoreThanTwoTimesWorse(old, new *benchstat.Metrics) (float64, error) {
+	if new.Mean > 2*old.Mean {
+		return 0.0, nil
+	}
+
+	return 1.0, nil
+}
+
+func compareToBaseline(testPkg, privateRepo string, run []byte) error {
+	var buf bytes.Buffer
+
+	goTest := exec.Command("go", "test", "-tags", "private,solution", "-bench=.", testPkg)
+	goTest.Dir = privateRepo
+	goTest.Stdout = &buf
+	goTest.Stderr = os.Stderr
+	if err := goTest.Run(); err != nil {
+		return fmt.Errorf("baseline benchmark failed: %w", err)
+	}
+
+	c := &benchstat.Collection{
+		DeltaTest: noMoreThanTwoTimesWorse,
+	}
+	c.AddConfig("baseline.txt", buf.Bytes())
+	c.AddConfig("new.txt", run)
+
+	tables := c.Tables()
+	benchstat.FormatText(os.Stderr, tables)
+
+	for _, c := range tables {
+		for _, r := range c.Rows {
+			if r.Change == -1 {
+				return fmt.Errorf("solution is worse than baseline on test %q", c.Metric)
+			}
 		}
 	}
 

tools/testtool/testdata/submissions/incorrect/badbenchmark/private/.golangci.yml

@@ -0,0 +1,77 @@
+# options for analysis running
+run:
+  # default concurrency is a available CPU number
+  concurrency: 8
+
+  # timeout for analysis, e.g. 30s, 5m, default is 1m
+  deadline: 5m
+
+  # exit code when at least one issue was found, default is 1
+  issues-exit-code: 1
+
+  # include test files or not, default is true
+  tests: true
+
+
+# output configuration options
+output:
+  # colored-line-number|line-number|json|tab|checkstyle, default is "colored-line-number"
+  format: colored-line-number
+
+  # print lines of code with issue, default is true
+  print-issued-lines: true
+
+  # print linter name in the end of issue text, default is true
+  print-linter-name: true
+
+
+# all available settings of specific linters
+linters-settings:
+  govet:
+    # report about shadowed variables
+    check-shadowing: true
+  golint:
+    # minimal confidence for issues, default is 0.8
+    min-confidence: 0.8
+  gofmt:
+    # simplify code: gofmt with `-s` option, true by default
+    simplify: true
+  goimports:
+    # put imports beginning with prefix after 3rd-party packages;
+    # it's a comma-separated list of prefixes
+    local-prefixes: gitlab.com
+
+linters:
+  disable-all: true
+  enable:
+    - errcheck
+    - gofmt
+    - golint
+    - gosimple
+    - govet
+    - ineffassign
+    - scopelint
+    - staticcheck
+    - typecheck
+    - unconvert
+
+
+issues:
+  # List of regexps of issue texts to exclude, empty list by default.
+  # But independently from this option we use default exclude patterns,
+  # it can be disabled by `exclude-use-default: false`. To list all
+  # excluded by default patterns execute `golangci-lint run --help`
+  exclude:
+    - Using the variable on range scope .* in function literal
+
+  # Independently from option `exclude` we use default exclude patterns,
+  # it can be disabled by this option. To list all
+  # excluded by default patterns execute `golangci-lint run --help`.
+  # Default value for this option is true.
+  exclude-use-default: true
+
+  # Maximum issues count per one linter. Set to 0 to disable. Default is 50.
+  max-per-linter: 0
+
+  # Maximum count of issues with the same text. Set to 0 to disable. Default is 3.
+  max-same-issues: 0

tools/testtool/testdata/submissions/incorrect/badbenchmark/private/badbenchmark/sum.go

@@ -0,0 +1,7 @@
+// +build !solution
+
+package badbenchmark
+
+func Sum(a, b int64) int64 {
+	return 0
+}

tools/testtool/testdata/submissions/incorrect/badbenchmark/private/badbenchmark/sum_solution.go

@@ -0,0 +1,10 @@
+// +build solution
+
+package badbenchmark
+
+import "time"
+
+func Sum(a, b int64) int64 {
+	time.Sleep(time.Millisecond)
+	return a + b
+}

tools/testtool/testdata/submissions/incorrect/badbenchmark/private/badbenchmark/sum_test.go

@@ -0,0 +1,25 @@
+package badbenchmark
+
+import (
+	"fmt"
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func BenchmarkSum(b *testing.B) {
+	for i, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+	} {
+		b.Run(fmt.Sprint(i), func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_ = Sum(input.a, input.b)
+			}
+		})
+	}
+}

tools/testtool/testdata/submissions/incorrect/badbenchmark/private/go.mod

@@ -0,0 +1,14 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/go-resty/resty/v2 v2.1.0
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	go.uber.org/goleak v1.0.0
+	golang.org/x/net v0.0.0-20190628185345-da137c7871d7
+	golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+	gopkg.in/yaml.v2 v2.2.8
+)

tools/testtool/testdata/submissions/incorrect/badbenchmark/private/go.sum

@@ -0,0 +1,98 @@
+cloud.google.com/go v0.0.0-20170206221025-ce650573d812/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/GoogleCloudPlatform/cloudsql-proxy v0.0.0-20190129172621-c8b1d7a94ddf/go.mod h1:aJ4qN3TfrelA6NZ6AXsXRfmEVaYin3EDbSPJrKS8OXo=
+github.com/aclements/go-gg v0.0.0-20170118225347-6dbb4e4fefb0/go.mod h1:55qNq4vcpkIuHowELi5C8e+1yUHtoLoOUR9QU5j7Tes=
+github.com/aclements/go-moremath v0.0.0-20161014184102-0ff62e0875ff/go.mod h1:idZL3yvz4kzx1dsBOAC+oYv6L92P1oFEhUXUB1A/lwQ=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
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tools/testtool/testdata/submissions/incorrect/badbenchmark/student/badbenchmark/sum.go

@@ -0,0 +1,10 @@
+// +build !solution
+
+package badbenchmark
+
+import "time"
+
+func Sum(a, b int64) int64 {
+	time.Sleep(time.Millisecond * 10)
+	return a + b
+}

tools/testtool/testdata/submissions/incorrect/badbenchmark/student/badbenchmark/sum_test.go

@@ -0,0 +1,25 @@
+package badbenchmark
+
+import (
+	"fmt"
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func BenchmarkSum(b *testing.B) {
+	for i, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+	} {
+		b.Run(fmt.Sprint(i), func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_ = Sum(input.a, input.b)
+			}
+		})
+	}
+}

tools/testtool/testdata/submissions/incorrect/badbenchmark/student/go.mod

@@ -0,0 +1,9 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

tools/testtool/testdata/submissions/incorrect/badbenchmark/student/go.sum

@@ -0,0 +1,53 @@
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