90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package executor_test
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import (
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"context"
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"fmt"
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"runtime"
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"runtime/debug"
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"testing"
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"github.com/pingcap/tidb/testkit"
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"github.com/stretchr/testify/require"
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)
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func TestPBMemoryLeak(t *testing.T) {
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debug.SetGCPercent(1000)
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defer debug.SetGCPercent(100)
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store := testkit.CreateMockStore(t)
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("create database test_mem")
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tk.MustExec("use test_mem")
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// prepare data
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totalSize := uint64(256 << 20) // 256MB
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blockSize := uint64(8 << 10) // 8KB
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delta := totalSize / 5
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numRows := totalSize / blockSize
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tk.MustExec(fmt.Sprintf("create table t (c varchar(%v))", blockSize))
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sql := fmt.Sprintf("insert into t values (space(%v))", blockSize)
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for i := uint64(0); i < numRows; i++ {
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tk.MustExec(sql)
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}
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// read data
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runtime.GC()
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allocatedBegin, inUseBegin := readMem()
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records, err := tk.Session().Execute(context.Background(), "select * from t")
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require.NoError(t, err)
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record := records[0]
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rowCnt := 0
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chk := record.NewChunk(nil)
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for {
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require.NoError(t, record.Next(context.Background(), chk))
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rowCnt += chk.NumRows()
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if chk.NumRows() == 0 {
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break
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}
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}
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require.Equal(t, int(numRows), rowCnt)
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// check memory before close
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runtime.GC()
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allocatedAfter, inUseAfter := readMem()
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require.GreaterOrEqual(t, allocatedAfter-allocatedBegin, totalSize)
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require.Less(t, memDiff(inUseAfter, inUseBegin), delta)
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runtime.GC()
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allocatedFinal, inUseFinal := readMem()
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require.Less(t, allocatedFinal-allocatedAfter, delta)
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require.Less(t, memDiff(inUseFinal, inUseAfter), delta)
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}
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// nolint:unused
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func readMem() (allocated, heapInUse uint64) {
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var stat runtime.MemStats
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runtime.ReadMemStats(&stat)
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return stat.TotalAlloc, stat.HeapInuse
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}
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// nolint:unused
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func memDiff(m1, m2 uint64) uint64 {
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if m1 > m2 {
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return m1 - m2
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}
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return m2 - m1
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}
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