72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
// Copyright 2025 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 backup_test
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import (
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"github.com/pingcap/tidb/br/pkg/backup"
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"github.com/stretchr/testify/require"
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)
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func TestResourceConcurrentLimiter(t *testing.T) {
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limiter := backup.NewResourceMemoryLimiter(100)
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var tag int64 = 0
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limiter.Acquire(50)
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limiter.Acquire(50)
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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limiter.Acquire(200)
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require.Equal(t, int64(1), atomic.LoadInt64(&tag))
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require.Equal(t, int64(2), atomic.AddInt64(&tag, 1))
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limiter.Release(200)
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}()
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// acquire 200 is blocken
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require.Equal(t, int64(1), atomic.AddInt64(&tag, 1))
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limiter.Release(50)
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limiter.Release(50)
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wg.Wait()
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require.Equal(t, int64(2), atomic.LoadInt64(&tag))
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limiter.Acquire(99)
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limiter.Acquire(1)
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limiter.Release(100)
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}
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func TestResourceConcurrentLimiter2(t *testing.T) {
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limiter := backup.NewResourceMemoryLimiter(100)
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var wg sync.WaitGroup
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for range 20 {
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wg.Add(1)
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go func() {
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defer wg.Done()
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start := time.Now()
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current := limiter.Acquire(30)
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t.Log(current, time.Since(start))
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time.Sleep(time.Millisecond * 10)
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limiter.Release(30)
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require.LessOrEqual(t, current, 120)
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}()
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}
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wg.Wait()
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}
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