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|
package benchutil
import (
"fmt"
"math/rand"
"syscall"
"ior/internal/types"
)
const (
defaultMixSeed int64 = 1
defaultStreamTime uint64 = 1
defaultBasePid uint32 = 1000
defaultBaseTid uint32 = 2000
defaultBaseFd int32 = 64
)
type MixEvent uint8
const (
MixRead MixEvent = iota + 1
MixWrite
MixOpen
MixClose
MixStat
MixSync
MixFsync
MixAccess
MixMkdir
MixUnlink
MixRename
MixLink
MixFcntl
MixDup3
MixOpenByHandleAt
)
type MixEntry struct {
Event MixEvent
Weight int
}
type EventMix struct {
Entries []MixEntry
Seed int64
}
var ReadHeavy = EventMix{
Entries: []MixEntry{
{Event: MixRead, Weight: 30},
{Event: MixWrite, Weight: 30},
{Event: MixOpen, Weight: 10},
{Event: MixClose, Weight: 10},
{Event: MixStat, Weight: 10},
{Event: MixSync, Weight: 10},
},
Seed: defaultMixSeed,
}
var WriteHeavy = EventMix{
Entries: []MixEntry{
{Event: MixWrite, Weight: 40},
{Event: MixFsync, Weight: 20},
{Event: MixRead, Weight: 15},
{Event: MixOpen, Weight: 5},
{Event: MixClose, Weight: 5},
{Event: MixStat, Weight: 15},
},
Seed: defaultMixSeed,
}
var MetadataHeavy = EventMix{
Entries: []MixEntry{
{Event: MixStat, Weight: 15},
{Event: MixAccess, Weight: 15},
{Event: MixOpen, Weight: 12},
{Event: MixClose, Weight: 13},
{Event: MixMkdir, Weight: 10},
{Event: MixUnlink, Weight: 10},
{Event: MixRename, Weight: 8},
{Event: MixLink, Weight: 7},
{Event: MixRead, Weight: 5},
{Event: MixWrite, Weight: 5},
},
Seed: defaultMixSeed,
}
var DiverseAllTypes = EventMix{
Entries: []MixEntry{
{Event: MixOpen, Weight: 1},
{Event: MixRead, Weight: 1},
{Event: MixSync, Weight: 1},
{Event: MixStat, Weight: 1},
{Event: MixRename, Weight: 1},
{Event: MixFcntl, Weight: 1},
{Event: MixDup3, Weight: 1},
{Event: MixOpenByHandleAt, Weight: 1},
{Event: MixClose, Weight: 1},
},
Seed: defaultMixSeed,
}
func (m EventMix) GenerateStream(gen EventGenerator, n, numThreads int) ([][]byte, error) {
if n <= 0 {
return nil, nil
}
threadCount := numThreads
if threadCount < 1 {
threadCount = 1
}
entries := m.activeEntries()
totalWeight := sumWeights(entries)
rng := rand.New(rand.NewSource(m.seed()))
stream := make([][]byte, 0, n*2)
nextTime := defaultStreamTime
for i := 0; i < n; i++ {
threadIdx := i % threadCount
pid := defaultBasePid + uint32(threadIdx)
tid := defaultBaseTid + uint32(threadIdx)
fd := fdFor(threadIdx, i)
event := choose(entries, totalWeight, rng)
enter, exit, err := event.pair(gen, nextTime, pid, tid, fd, i)
if err != nil {
return nil, fmt.Errorf("generate event %v pair: %w", event, err)
}
stream = append(stream, enter, exit)
nextTime += gen.pairDelta() + 1
}
return stream, nil
}
func choose(entries []MixEntry, totalWeight int, rng *rand.Rand) MixEvent {
if totalWeight <= 0 {
return MixRead
}
roll := rng.Intn(totalWeight)
for _, entry := range entries {
if entry.Weight <= 0 {
continue
}
if roll < entry.Weight {
return entry.Event
}
roll -= entry.Weight
}
return entries[len(entries)-1].Event
}
func fdFor(threadIdx, seq int) int32 {
return defaultBaseFd + int32(threadIdx*100+seq%100)
}
func (m EventMix) activeEntries() []MixEntry {
active := make([]MixEntry, 0, len(m.Entries))
for _, entry := range m.Entries {
if entry.Weight > 0 {
active = append(active, entry)
}
}
if len(active) == 0 {
return DiverseAllTypes.Entries
}
return active
}
func (m EventMix) seed() int64 {
if m.Seed == 0 {
return defaultMixSeed
}
return m.Seed
}
func sumWeights(entries []MixEntry) int {
total := 0
for _, entry := range entries {
total += entry.Weight
}
return total
}
func (e MixEvent) pair(gen EventGenerator, time uint64, pid, tid uint32, fd int32, seq int) ([]byte, []byte, error) {
switch e {
case MixRead:
return gen.FdPair(time, pid, tid, fd, types.SYS_ENTER_READ, types.SYS_EXIT_READ, 128)
case MixWrite:
return gen.FdPair(time, pid, tid, fd, types.SYS_ENTER_WRITE, types.SYS_EXIT_WRITE, 256)
case MixOpen:
return gen.OpenPair(time, pid, tid)
case MixClose:
_, enter, err := gen.EnterFdEvent(time, pid, tid, fd, types.SYS_ENTER_CLOSE)
if err != nil {
return nil, nil, err
}
_, exit, err := gen.ExitFdEvent(time+gen.pairDelta(), pid, tid, fd, types.SYS_EXIT_CLOSE)
if err != nil {
return nil, nil, err
}
return enter, exit, nil
case MixStat:
path := fmt.Sprintf("/tmp/ior-stat-%d-%d", tid, seq)
return gen.PathPair(time, pid, tid, path, types.SYS_ENTER_NEWSTAT, types.SYS_EXIT_NEWSTAT, 0)
case MixSync:
return gen.NullPair(time, pid, tid, types.SYS_ENTER_SYNC, types.SYS_EXIT_SYNC)
case MixFsync:
return gen.FdPair(time, pid, tid, fd, types.SYS_ENTER_FSYNC, types.SYS_EXIT_FSYNC, 0)
case MixAccess:
path := fmt.Sprintf("/tmp/ior-access-%d-%d", tid, seq)
return gen.PathPair(time, pid, tid, path, types.SYS_ENTER_ACCESS, types.SYS_EXIT_ACCESS, 0)
case MixMkdir:
path := fmt.Sprintf("/tmp/ior-mkdir-%d-%d", tid, seq)
return gen.PathPair(time, pid, tid, path, types.SYS_ENTER_MKDIR, types.SYS_EXIT_MKDIR, 0)
case MixUnlink:
path := fmt.Sprintf("/tmp/ior-unlink-%d-%d", tid, seq)
return gen.PathPair(time, pid, tid, path, types.SYS_ENTER_UNLINK, types.SYS_EXIT_UNLINK, 0)
case MixRename:
oldname := fmt.Sprintf("/tmp/ior-old-%d-%d", tid, seq)
newname := fmt.Sprintf("/tmp/ior-new-%d-%d", tid, seq)
return gen.NamePair(time, pid, tid, oldname, newname, types.SYS_ENTER_RENAME, types.SYS_EXIT_RENAME, 0)
case MixLink:
oldname := fmt.Sprintf("/tmp/ior-link-old-%d-%d", tid, seq)
newname := fmt.Sprintf("/tmp/ior-link-new-%d-%d", tid, seq)
return gen.NamePair(time, pid, tid, oldname, newname, types.SYS_ENTER_LINK, types.SYS_EXIT_LINK, 0)
case MixFcntl:
return gen.FcntlPair(time, pid, tid, uint32(fd), syscall.F_SETFL, syscall.O_NONBLOCK, types.SYS_EXIT_FCNTL, 0)
case MixDup3:
return gen.Dup3Pair(time, pid, tid, fd, syscall.O_CLOEXEC, types.SYS_EXIT_DUP3, int64(fd+1))
case MixOpenByHandleAt:
_, enter, err := gen.EnterOpenByHandleAtEvent(time, pid, tid, syscall.O_RDWR)
if err != nil {
return nil, nil, err
}
_, exit, err := gen.ExitRetEvent(time+gen.pairDelta(), pid, tid, types.SYS_EXIT_OPEN_BY_HANDLE_AT, int64(fd))
if err != nil {
return nil, nil, err
}
return enter, exit, nil
default:
return gen.NullPair(time, pid, tid, types.SYS_ENTER_SYNC, types.SYS_EXIT_SYNC)
}
}
|
