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753e56ee29
Use only a single not completed pack file to keep the number of open and active pack files low. The main change here is to defer hashing the pack file to the upload step. This prevents the pack assembly step to become a bottleneck as the only task is now to write data to the temporary pack file. The tests are cleaned up to no longer reimplement packer manager functions.
113 lines
2.3 KiB
Go
113 lines
2.3 KiB
Go
package repository
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import (
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"context"
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"io"
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"math/rand"
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"sync"
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"testing"
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"github.com/restic/restic/internal/crypto"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
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)
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func randomID(rd io.Reader) restic.ID {
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id := restic.ID{}
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_, err := io.ReadFull(rd, id[:])
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if err != nil {
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panic(err)
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}
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return id
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}
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const maxBlobSize = 1 << 20
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func fillPacks(t testing.TB, rnd *rand.Rand, pm *packerManager, buf []byte) (bytes int) {
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for i := 0; i < 100; i++ {
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l := rnd.Intn(maxBlobSize)
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id := randomID(rnd)
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buf = buf[:l]
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// Only change a few bytes so we know we're not benchmarking the RNG.
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rnd.Read(buf[:min(l, 4)])
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n, err := pm.SaveBlob(context.TODO(), restic.DataBlob, id, buf, 0)
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if err != nil {
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t.Fatal(err)
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}
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if n != l+37 && n != l+37+36 {
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t.Errorf("Add() returned invalid number of bytes: want %v, got %v", l, n)
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}
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bytes += n
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}
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err := pm.Flush(context.TODO())
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if err != nil {
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t.Fatal(err)
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}
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return bytes
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}
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const randomSeed = 23
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var (
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once sync.Once
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totalSize int64
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)
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func TestPackerManager(t *testing.T) {
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bytes := testPackerManager(t)
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once.Do(func() { totalSize = bytes })
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}
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func testPackerManager(t testing.TB) int64 {
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rnd := rand.New(rand.NewSource(randomSeed))
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savedBytes := int(0)
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pm := newPackerManager(crypto.NewRandomKey(), restic.DataBlob, func(ctx context.Context, tp restic.BlobType, p *Packer) error {
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err := p.Finalize()
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if err != nil {
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return err
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}
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savedBytes += int(p.Size())
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return nil
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})
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blobBuf := make([]byte, maxBlobSize)
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bytes := fillPacks(t, rnd, pm, blobBuf)
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// bytes does not include the last packs header
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test.Equals(t, savedBytes, bytes+36)
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t.Logf("saved %d bytes", bytes)
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return int64(bytes)
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}
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func BenchmarkPackerManager(t *testing.B) {
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// Run testPackerManager if it hasn't run already, to set totalSize.
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once.Do(func() {
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totalSize = testPackerManager(t)
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})
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rnd := rand.New(rand.NewSource(randomSeed))
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blobBuf := make([]byte, maxBlobSize)
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t.ReportAllocs()
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t.SetBytes(totalSize)
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t.ResetTimer()
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for i := 0; i < t.N; i++ {
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rnd.Seed(randomSeed)
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pm := newPackerManager(crypto.NewRandomKey(), restic.DataBlob, func(ctx context.Context, t restic.BlobType, p *Packer) error {
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return nil
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})
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fillPacks(t, rnd, pm, blobBuf)
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}
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}
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