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index: let indexmap.Each iterate in allocation order

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Iterating through the indexmap according to the bucket order has the
problem that all indexEntries are accessed in random order which is
rather cache inefficient.

As we already keep a list of all allocated blocks, just iterate through
it. This allows iterating through a batch of indexEntries without random
memory accesses. In addition, the packID will likely remain similar
across multiple blobs as all blobs of a pack file are added as a single
batch.
This commit is contained in:
Michael Eischer 2023-05-30 20:12:36 +02:00
parent f1c388c623
commit fc05e35a08
1 changed files with 4 additions and 7 deletions
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11
internal/index/indexmap.go
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@ -54,13 +54,10 @@ func (m *indexMap) add(id restic.ID, packIdx int, offset, length uint32, uncompr
// foreach calls fn for all entries in the map, until fn returns false.
func (m *indexMap) foreach(fn func(*indexEntry) bool) {
for _, ei := range m.buckets {
for ei != 0 {
e := m.resolve(ei)
if !fn(e) {
return
}
ei = e.next
blockCount := m.blockList.Size()
for i := uint(1); i < blockCount; i++ {
if !fn(m.resolve(i)) {
return
}
}
}