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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package bench
import (
"fmt"
"sync/atomic"
"testing"
"time"
"golang.org/x/tools/gopls/internal/protocol"
)
// BenchmarkTyping simulates typing steadily in a single file at different
// paces.
//
// The key metric for this benchmark is not latency, but cpu_seconds per
// operation.
func BenchmarkTyping(b *testing.B) {
for _, test := range didChangeTests {
b.Run(test.repo, func(b *testing.B) {
env := getRepo(b, test.repo).sharedEnv(b)
env.OpenFile(test.file)
defer closeBuffer(b, env, test.file)
// Insert the text we'll be modifying at the top of the file.
env.EditBuffer(test.file, protocol.TextEdit{NewText: "// __TEST_PLACEHOLDER_0__\n"})
env.AfterChange()
delays := []time.Duration{
10 * time.Millisecond, // automated changes
50 * time.Millisecond, // very fast mashing, or fast key sequences
150 * time.Millisecond, // avg interval for 80wpm typing.
}
for _, delay := range delays {
b.Run(delay.String(), func(b *testing.B) {
if stopAndRecord := startProfileIfSupported(b, env, qualifiedName(test.repo, "typing")); stopAndRecord != nil {
defer stopAndRecord()
}
ticker := time.NewTicker(delay)
for i := 0; i < b.N; i++ {
edits := atomic.AddInt64(&editID, 1)
env.EditBuffer(test.file, protocol.TextEdit{
Range: protocol.Range{
Start: protocol.Position{Line: 0, Character: 0},
End: protocol.Position{Line: 1, Character: 0},
},
// Increment the placeholder text, to ensure cache misses.
NewText: fmt.Sprintf("// __TEST_PLACEHOLDER_%d__\n", edits),
})
<-ticker.C
}
b.StopTimer()
ticker.Stop()
env.AfterChange() // wait for all change processing to complete
})
}
})
}
}
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