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// Copyright 2019 PingCAP, Inc.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package executor_test
import (
"context"
"fmt"
"runtime"
. "github.com/pingcap/check"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/session"
"github.com/pingcap/tidb/store/mockstore"
)
var _ = SerialSuites(&testMemoryLeak{})
type testMemoryLeak struct {
store kv.Storage
domain *domain.Domain
}
func (s *testMemoryLeak) SetUpSuite(c *C) {
var err error
s.store, err = mockstore.NewMockTikvStore()
c.Assert(err, IsNil)
s.domain, err = session.BootstrapSession(s.store)
c.Assert(err, IsNil)
}
func (s *testMemoryLeak) TearDownSuite(c *C) {
s.domain.Close()
c.Assert(s.store.Close(), IsNil)
}
func (s *testMemoryLeak) TestPBMemoryLeak(c *C) {
c.Skip("too slow")
se, err := session.CreateSession4Test(s.store)
c.Assert(err, IsNil)
_, err = se.Execute(context.Background(), "create database test_mem")
c.Assert(err, IsNil)
_, err = se.Execute(context.Background(), "use test_mem")
c.Assert(err, IsNil)
// prepare data
totalSize := uint64(256 << 20) // 256MB
blockSize := uint64(8 << 10) // 8KB
delta := totalSize / 5
numRows := totalSize / blockSize
_, err = se.Execute(context.Background(), fmt.Sprintf("create table t (c varchar(%v))", blockSize))
c.Assert(err, IsNil)
defer func() {
_, err = se.Execute(context.Background(), "drop table t")
c.Assert(err, IsNil)
}()
sql := fmt.Sprintf("insert into t values (space(%v))", blockSize)
for i := uint64(0); i < numRows; i++ {
_, err = se.Execute(context.Background(), sql)
c.Assert(err, IsNil)
}
// read data
runtime.GC()
allocatedBegin, inUseBegin := s.readMem()
records, err := se.Execute(context.Background(), "select * from t")
c.Assert(err, IsNil)
record := records[0]
rowCnt := 0
chk := record.NewChunk()
for {
c.Assert(record.Next(context.Background(), chk), IsNil)
rowCnt += chk.NumRows()
if chk.NumRows() == 0 {
break
}
}
c.Assert(rowCnt, Equals, int(numRows))
// check memory before close
runtime.GC()
allocatedAfter, inUseAfter := s.readMem()
c.Assert(allocatedAfter-allocatedBegin, GreaterEqual, totalSize)
c.Assert(s.memDiff(inUseAfter, inUseBegin), Less, delta)
se.Close()
runtime.GC()
allocatedFinal, inUseFinal := s.readMem()
c.Assert(allocatedFinal-allocatedAfter, Less, delta)
c.Assert(s.memDiff(inUseFinal, inUseAfter), Less, delta)
}
func (s *testMemoryLeak) readMem() (allocated, heapInUse uint64) {
var stat runtime.MemStats
runtime.ReadMemStats(&stat)
return stat.TotalAlloc, stat.HeapInuse
}
func (s *testMemoryLeak) memDiff(m1, m2 uint64) uint64 {
if m1 > m2 {
return m1 - m2
}
return m2 - m1
}