mirror of
https://github.com/octoleo/restic.git
synced 2024-11-25 06:07:44 +00:00
e5d597fd22
The new genericized LRU cache no longer needs to have the IDs separately allocated: name old time/op new time/op delta Add-8 494ns ± 2% 388ns ± 2% -21.46% (p=0.000 n=10+9) name old alloc/op new alloc/op delta Add-8 176B ± 0% 152B ± 0% -13.64% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Add-8 5.00 ± 0% 3.00 ± 0% -40.00% (p=0.000 n=10+10)
80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
package bloblru
|
|
|
|
import (
|
|
"math/rand"
|
|
"testing"
|
|
|
|
"github.com/restic/restic/internal/restic"
|
|
rtest "github.com/restic/restic/internal/test"
|
|
)
|
|
|
|
func TestCache(t *testing.T) {
|
|
var id1, id2, id3 restic.ID
|
|
id1[0] = 1
|
|
id2[0] = 2
|
|
id3[0] = 3
|
|
|
|
const (
|
|
kiB = 1 << 10
|
|
cacheSize = 64*kiB + 3*overhead
|
|
)
|
|
|
|
c := New(cacheSize)
|
|
|
|
addAndCheck := func(id restic.ID, exp []byte) {
|
|
c.Add(id, exp)
|
|
blob, ok := c.Get(id)
|
|
rtest.Assert(t, ok, "blob %v added but not found in cache", id)
|
|
rtest.Equals(t, &exp[0], &blob[0])
|
|
rtest.Equals(t, exp, blob)
|
|
}
|
|
|
|
// Our blobs have len 1 but larger cap. The cache should check the cap,
|
|
// since it more reliably indicates the amount of memory kept alive.
|
|
addAndCheck(id1, make([]byte, 1, 32*kiB))
|
|
addAndCheck(id2, make([]byte, 1, 30*kiB))
|
|
addAndCheck(id3, make([]byte, 1, 10*kiB))
|
|
|
|
_, ok := c.Get(id2)
|
|
rtest.Assert(t, ok, "blob %v not present", id2)
|
|
_, ok = c.Get(id1)
|
|
rtest.Assert(t, !ok, "blob %v present, but should have been evicted", id1)
|
|
|
|
c.Add(id1, make([]byte, 1+c.size))
|
|
_, ok = c.Get(id1)
|
|
rtest.Assert(t, !ok, "blob %v too large but still added to cache")
|
|
|
|
c.c.Remove(id1)
|
|
c.c.Remove(id3)
|
|
c.c.Remove(id2)
|
|
|
|
rtest.Equals(t, cacheSize, c.size)
|
|
rtest.Equals(t, cacheSize, c.free)
|
|
}
|
|
|
|
func BenchmarkAdd(b *testing.B) {
|
|
const (
|
|
MiB = 1 << 20
|
|
nblobs = 64
|
|
)
|
|
|
|
c := New(64 * MiB)
|
|
|
|
buf := make([]byte, 8*MiB)
|
|
ids := make([]restic.ID, nblobs)
|
|
sizes := make([]int, nblobs)
|
|
|
|
r := rand.New(rand.NewSource(100))
|
|
for i := range ids {
|
|
r.Read(ids[i][:])
|
|
sizes[i] = r.Intn(8 * MiB)
|
|
}
|
|
|
|
b.ResetTimer()
|
|
b.ReportAllocs()
|
|
|
|
for i := 0; i < b.N; i++ {
|
|
c.Add(ids[i%nblobs], buf[:sizes[i%nblobs]])
|
|
}
|
|
}
|