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cmd, consensus: add option to disable mmap for DAG caches/datasets (#20484)

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* cmd, consensus: add option to disable mmap for DAG caches/datasets

* consensus: add benchmarks for mmap with/with lock
This commit is contained in:
Hanjiang Yu
2020-03-31 16:44:04 +08:00
committed by GitHub
parent 76eed9e50d
commit 8f05cfa122
8 changed files with 108 additions and 48 deletions
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27
consensus/ethash/algorithm_test.go
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@ -729,7 +729,7 @@ func TestConcurrentDiskCacheGeneration(t *testing.T) {
go func(idx int) {
defer pend.Done()
ethash := New(Config{cachedir, 0, 1, "", 0, 0, ModeNormal, nil}, nil, false)
ethash := New(Config{cachedir, 0, 1, false, "", 0, 0, false, ModeNormal, nil}, nil, false)
defer ethash.Close()
if err := ethash.VerifySeal(nil, block.Header()); err != nil {
t.Errorf("proc %d: block verification failed: %v", idx, err)
@ -787,3 +787,28 @@ func BenchmarkHashimotoFullSmall(b *testing.B) {
hashimotoFull(dataset, hash, 0)
}
}
func benchmarkHashimotoFullMmap(b *testing.B, name string, lock bool) {
b.Run(name, func(b *testing.B) {
tmpdir, err := ioutil.TempDir("", "ethash-test")
if err != nil {
b.Fatal(err)
}
defer os.RemoveAll(tmpdir)
d := &dataset{epoch: 0}
d.generate(tmpdir, 1, lock, false)
var hash [common.HashLength]byte
b.ResetTimer()
for i := 0; i < b.N; i++ {
binary.PutVarint(hash[:], int64(i))
hashimotoFull(d.dataset, hash[:], 0)
}
})
}
// Benchmarks the full verification performance for mmap
func BenchmarkHashimotoFullMmap(b *testing.B) {
benchmarkHashimotoFullMmap(b, "WithLock", true)
benchmarkHashimotoFullMmap(b, "WithoutLock", false)
}