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repository: recalibrate index batch allocation size

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This commit is contained in:
Michael Eischer 2022-02-13 17:49:49 +01:00
parent 6fb408d90e
commit fd05037e1a
1 changed files with 3 additions and 3 deletions
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6
internal/repository/indexmap.go
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@ -131,12 +131,12 @@ func (m *indexMap) len() uint { return m.numentries }
func (m *indexMap) newEntry() *indexEntry { func (m *indexMap) newEntry() *indexEntry {
// Allocating in batches means that we get closer to optimal space usage, // Allocating in batches means that we get closer to optimal space usage,
// as Go's malloc will overallocate for structures of size 56 (indexEntry // as Go's malloc will overallocate for structures of size 60 (indexEntry
// on amd64). // on amd64).
// //
// 256*56 and 256*48 both have minimal malloc overhead among reasonable sizes. // 128*60 and 128*60 both have low malloc overhead among reasonable sizes.
// See src/runtime/sizeclasses.go in the standard library. // See src/runtime/sizeclasses.go in the standard library.
const entryAllocBatch = 256 const entryAllocBatch = 128
if m.free == nil { if m.free == nil {
free := new([entryAllocBatch]indexEntry) free := new([entryAllocBatch]indexEntry)