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df2c03a6a4
When looking up a blob in the master index, with several indexes present in the master index, a significant amount of time is spent generating errors for each failed lookup. However, these errors are often used to check if a blob is present, but the contents are not inspected making the overhead of the error not useful. Instead, change Index.Lookup (and Index.LookupSize) to instead return a boolean denoting if the blob was found instead of an error. Also change all the calls to these functions to handle the new function signature. benchmark old ns/op new ns/op delta BenchmarkMasterIndexLookupSingleIndex-6 820 897 +9.39% BenchmarkMasterIndexLookupMultipleIndex-6 12821 2001 -84.39% BenchmarkMasterIndexLookupSingleIndexUnknown-6 5378 492 -90.85% BenchmarkMasterIndexLookupMultipleIndexUnknown-6 17026 1649 -90.31% benchmark old allocs new allocs delta BenchmarkMasterIndexLookupSingleIndex-6 9 9 +0.00% BenchmarkMasterIndexLookupMultipleIndex-6 59 19 -67.80% BenchmarkMasterIndexLookupSingleIndexUnknown-6 22 6 -72.73% BenchmarkMasterIndexLookupMultipleIndexUnknown-6 72 16 -77.78% benchmark old bytes new bytes delta BenchmarkMasterIndexLookupSingleIndex-6 160 160 +0.00% BenchmarkMasterIndexLookupMultipleIndex-6 3200 240 -92.50% BenchmarkMasterIndexLookupSingleIndexUnknown-6 1232 48 -96.10% BenchmarkMasterIndexLookupMultipleIndexUnknown-6 4272 128 -97.00%
123 lines
2.8 KiB
Go
123 lines
2.8 KiB
Go
package repository_test
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import (
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"math/rand"
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"testing"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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)
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func TestMasterIndexLookup(t *testing.T) {
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idInIdx1 := restic.NewRandomID()
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idInIdx2 := restic.NewRandomID()
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blob1 := restic.PackedBlob{
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PackID: restic.NewRandomID(),
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Blob: restic.Blob{
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Type: restic.DataBlob,
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ID: idInIdx1,
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Length: 10,
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Offset: 0,
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},
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}
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blob2 := restic.PackedBlob{
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PackID: restic.NewRandomID(),
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Blob: restic.Blob{
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Type: restic.DataBlob,
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ID: idInIdx2,
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Length: 100,
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Offset: 10,
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},
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}
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idx1 := repository.NewIndex()
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idx1.Store(blob1)
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idx2 := repository.NewIndex()
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idx2.Store(blob2)
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mIdx := repository.NewMasterIndex()
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mIdx.Insert(idx1)
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mIdx.Insert(idx2)
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blobs, found := mIdx.Lookup(idInIdx1, restic.DataBlob)
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rtest.Assert(t, found, "Expected to find blob id %v from index 1", idInIdx1)
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rtest.Equals(t, []restic.PackedBlob{blob1}, blobs)
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blobs, found = mIdx.Lookup(idInIdx2, restic.DataBlob)
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rtest.Assert(t, found, "Expected to find blob id %v from index 2", idInIdx2)
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rtest.Equals(t, []restic.PackedBlob{blob2}, blobs)
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blobs, found = mIdx.Lookup(restic.NewRandomID(), restic.DataBlob)
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rtest.Assert(t, !found, "Expected to not find a blob when fetching with a random id")
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rtest.Assert(t, blobs == nil, "Expected no blobs when fetching with a random id")
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}
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func BenchmarkMasterIndexLookupSingleIndex(b *testing.B) {
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idx1, lookupID := createRandomIndex(rand.New(rand.NewSource(0)))
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mIdx := repository.NewMasterIndex()
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mIdx.Insert(idx1)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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mIdx.Lookup(lookupID, restic.DataBlob)
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}
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}
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func BenchmarkMasterIndexLookupMultipleIndex(b *testing.B) {
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rng := rand.New(rand.NewSource(0))
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mIdx := repository.NewMasterIndex()
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for i := 0; i < 5; i++ {
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idx, _ := createRandomIndex(rand.New(rng))
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mIdx.Insert(idx)
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}
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idx1, lookupID := createRandomIndex(rand.New(rng))
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mIdx.Insert(idx1)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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mIdx.Lookup(lookupID, restic.DataBlob)
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}
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}
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func BenchmarkMasterIndexLookupSingleIndexUnknown(b *testing.B) {
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lookupID := restic.NewRandomID()
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idx1, _ := createRandomIndex(rand.New(rand.NewSource(0)))
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mIdx := repository.NewMasterIndex()
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mIdx.Insert(idx1)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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mIdx.Lookup(lookupID, restic.DataBlob)
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}
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}
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func BenchmarkMasterIndexLookupMultipleIndexUnknown(b *testing.B) {
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rng := rand.New(rand.NewSource(0))
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lookupID := restic.NewRandomID()
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mIdx := repository.NewMasterIndex()
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for i := 0; i < 5; i++ {
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idx, _ := createRandomIndex(rand.New(rng))
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mIdx.Insert(idx)
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}
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idx1, _ := createRandomIndex(rand.New(rng))
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mIdx.Insert(idx1)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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mIdx.Lookup(lookupID, restic.DataBlob)
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}
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}
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