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|
package inomap
import (
"sync"
"testing"
)
const (
// bit 63 is used as the spill bit
spillBit = 1 << 63
)
func TestTranslate(t *testing.T) {
m := New(0)
q := QIno{Ino: 1}
out := m.Translate(q)
if out != 1 {
t.Errorf("expected 1, got %d", out)
}
q.Ino = maxPassthruIno
out = m.Translate(q)
if out < maxPassthruIno {
t.Errorf("got %d", out)
}
out2 := m.Translate(q)
if out2 != out {
t.Errorf("unstable mapping: %d %d", out2, out)
}
}
func TestTranslateStress(t *testing.T) {
const baseDev = 12345
m := New(baseDev)
var wg sync.WaitGroup
wg.Add(4)
go func() {
// Some normal inode numbers on baseDev
var q QIno
q.Dev = baseDev
for i := uint64(1); i <= 10000; i++ {
q.Ino = i
out := m.Translate(q)
if out != i {
t.Errorf("i=%d out=%d", i, out)
break
}
}
wg.Done()
}()
go func() {
// Very high (>maxPassthruIno) inode numbers on baseDev
var q QIno
q.Dev = baseDev
for i := uint64(1); i <= 10000; i++ {
q.Ino = maxPassthruIno + i
out := m.Translate(q)
if out < maxPassthruIno {
t.Errorf("out=%d", out)
break
}
}
wg.Done()
}()
go func() {
// Device 9999999
var q QIno
q.Dev = 9999999
for i := uint64(1); i <= 10000; i++ {
q.Ino = i
out := m.Translate(q)
if out < maxPassthruIno {
t.Errorf("out=%d", out)
break
}
}
wg.Done()
}()
go func() {
// Device 4444444
var q QIno
q.Dev = 4444444
for i := uint64(1); i <= 10000; i++ {
q.Ino = i
out := m.Translate(q)
if out < maxPassthruIno {
t.Errorf("out=%d", out)
break
}
}
wg.Done()
}()
wg.Wait()
if len(m.spillMap) != 10000 {
t.Errorf("len=%d", len(m.spillMap))
}
if len(m.namespaceMap) != 3 {
t.Errorf("len=%d", len(m.namespaceMap))
}
}
func TestSpill(t *testing.T) {
m := New(0)
var q QIno
q.Ino = maxPassthruIno + 1
out1 := m.Translate(q)
if out1&spillBit == 0 {
t.Error("spill bit not set")
}
out2 := m.Translate(q)
if out2&spillBit == 0 {
t.Error("spill bit not set")
}
if out1 != out2 {
t.Errorf("unstable mapping: %d vs %d", out1, out2)
}
}
// TestUniqueness checks that unique (Dev, Flags, Ino) tuples get unique inode
// numbers
func TestUniqueness(t *testing.T) {
m := New(0)
var q QIno
outMap := make(map[uint64]struct{})
for q.Dev = 0; q.Dev < 10; q.Dev++ {
for q.Tag = 0; q.Tag < 10; q.Tag++ {
// some go into spill
for q.Ino = maxPassthruIno - 100; q.Ino < maxPassthruIno+100; q.Ino++ {
out := m.Translate(q)
_, found := outMap[out]
if found {
t.Fatalf("inode number %d already used", out)
}
outMap[out] = struct{}{}
}
}
}
if len(outMap) != 10*10*200 {
t.Errorf("%d", len(outMap))
}
}
func BenchmarkTranslateSingleDev(b *testing.B) {
m := New(0)
var q QIno
for n := 0; n < b.N; n++ {
q.Ino = uint64(n % 1000)
m.Translate(q)
}
}
func BenchmarkTranslateManyDevs(b *testing.B) {
m := New(0)
var q QIno
for n := 0; n < b.N; n++ {
q.Dev = uint64(n % 10)
q.Ino = uint64(n % 1000)
m.Translate(q)
}
}
|
