github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/internal/vfs/syncing_file_linux_test.go (about)

     1  // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build linux && !arm
    16  
    17  package vfs
    18  
    19  import (
    20  	"fmt"
    21  	"os"
    22  	"syscall"
    23  	"testing"
    24  	"unsafe"
    25  )
    26  
    27  func TestSyncRangeSmokeTest(t *testing.T) {
    28  	testCases := []struct {
    29  		err      error
    30  		expected bool
    31  	}{
    32  		{nil, true},
    33  		{syscall.EINVAL, true},
    34  		{syscall.ENOSYS, false},
    35  	}
    36  	for i, c := range testCases {
    37  		t.Run("", func(t *testing.T) {
    38  			ok := syncRangeSmokeTest(uintptr(i),
    39  				func(fd int, off int64, n int64, flags int) (err error) {
    40  					if i != fd {
    41  						t.Fatalf("expected fd %d, but got %d", i, fd)
    42  					}
    43  					return c.err
    44  				})
    45  			if c.expected != ok {
    46  				t.Fatalf("expected %t, but got %t: %v", c.expected, ok, c.err)
    47  			}
    48  		})
    49  	}
    50  }
    51  
    52  func BenchmarkDirectIOWrite(b *testing.B) {
    53  	const targetSize = 16 << 20
    54  	const alignment = 4096
    55  
    56  	var wsizes []int
    57  	if testing.Verbose() {
    58  		wsizes = []int{4 << 10, 8 << 10, 16 << 10, 32 << 10}
    59  	} else {
    60  		wsizes = []int{4096}
    61  	}
    62  
    63  	for _, wsize := range wsizes {
    64  		b.Run(fmt.Sprintf("wsize=%d", wsize), func(b *testing.B) {
    65  			tmpf, err := os.CreateTemp("", "bitalosdb-db-syncing-file-")
    66  			if err != nil {
    67  				b.Fatal(err)
    68  			}
    69  			filename := tmpf.Name()
    70  			_ = tmpf.Close()
    71  			defer os.Remove(filename)
    72  
    73  			var f *os.File
    74  			var size int
    75  			buf := make([]byte, wsize+alignment)
    76  			if a := uintptr(unsafe.Pointer(&buf[0])) & uintptr(alignment-1); a != 0 {
    77  				buf = buf[alignment-a:]
    78  			}
    79  			buf = buf[:wsize]
    80  			init := true
    81  
    82  			b.SetBytes(int64(len(buf)))
    83  			b.ResetTimer()
    84  			for i := 0; i < b.N; i++ {
    85  				if f == nil {
    86  					b.StopTimer()
    87  					f, err = os.OpenFile(filename, syscall.O_DIRECT|os.O_RDWR, 0666)
    88  					if err != nil {
    89  						b.Fatal(err)
    90  					}
    91  					if init {
    92  						for size = 0; size < targetSize; size += len(buf) {
    93  							if _, err := f.WriteAt(buf, int64(size)); err != nil {
    94  								b.Fatal(err)
    95  							}
    96  						}
    97  					}
    98  					if err := f.Sync(); err != nil {
    99  						b.Fatal(err)
   100  					}
   101  					size = 0
   102  					b.StartTimer()
   103  				}
   104  				if _, err := f.WriteAt(buf, int64(size)); err != nil {
   105  					b.Fatal(err)
   106  				}
   107  				size += len(buf)
   108  				if size >= targetSize {
   109  					_ = f.Close()
   110  					f = nil
   111  				}
   112  			}
   113  			b.StopTimer()
   114  		})
   115  	}
   116  }