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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 (
"testing"
. "golang.org/x/tools/gopls/internal/test/integration"
)
// BenchmarkReload benchmarks reloading a file metadata after a change to an import.
//
// This ensures we are able to diagnose a changed file without reloading all
// invalidated packages. See also golang/go#61344
func BenchmarkReload(b *testing.B) {
// TODO(rfindley): add more tests, make this test table-driven
const (
repo = "kubernetes"
// pkg/util/hash is transitively imported by a large number of packages.
// We should not need to reload those packages to get a diagnostic.
file = "pkg/util/hash/hash.go"
)
b.Run(repo, func(b *testing.B) {
env := getRepo(b, repo).sharedEnv(b)
env.OpenFile(file)
defer closeBuffer(b, env, file)
env.AfterChange()
if stopAndRecord := startProfileIfSupported(b, env, qualifiedName(repo, "reload")); stopAndRecord != nil {
defer stopAndRecord()
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
// Change the "hash" import. This may result in cache hits, but that's
// OK: the goal is to ensure that we don't reload more than just the
// current package.
env.RegexpReplace(file, `"hash"`, `"hashx"`)
// Note: don't use env.AfterChange() here: we only want to await the
// first diagnostic.
//
// Awaiting a full diagnosis would await diagnosing everything, which
// would require reloading everything.
env.Await(Diagnostics(ForFile(file)))
env.RegexpReplace(file, `"hashx"`, `"hash"`)
env.Await(NoDiagnostics(ForFile(file)))
}
})
}
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