How to use hardStop method of executor Package

Best K6 code snippet using executor.hardStop

vu_handle.go

Source:vu_handle.go Github

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...39short names for input:40- start is the method start41- loop is a loop of runLoopsIfPossible42- grace is the method gracefulStop43- hard is the method hardStop44+-------+-------------------------------------+---------------------------------------------------+45| input | current | next state | notes |46+-------+-------------------------------------+---------------------------------------------------+47| start | stopped | starting | normal |48| start | starting | starting | nothing |49| start | running | running | nothing |50| start | toGracefulStop | running | we raced with the loop stopping, just continue |51| start | toHardStop | starting | same as stopped really |52| loop | stopped | stopped | we actually are blocked on canStartIter |53| loop | starting | running | get new VU and context |54| loop | running | running | usually fast path |55| loop | toGracefulStop | stopped | cancel the context and make new one |56| loop | toHardStop | stopped | cancel the context and make new one |57| grace | stopped | stopped | nothing |58| grace | starting | stopped | cancel the context to return the VU |59| grace | running | toGracefulStop | normal one, the actual work is in the loop |60| grace | toGracefulStop | toGracefulStop | nothing |61| grace | toHardSTop | toHardStop | nothing |62| hard | stopped | stopped | nothing |63| hard | starting | stopped | short circuit as in the grace case, not necessary |64| hard | running | toHardStop | normal, cancel context and reinitialize it |65| hard | toGracefulStop | toHardStop | normal, cancel context and reinitialize it |66| hard | toHardStop | toHardStop | nothing |67+-------+-----------------+-------------------+----------------------------------------------------+68*/69// This is a helper type used in executors where we have to dynamically control70// the number of VUs that are simultaneously running. For the moment, it is used71// in the RampingVUs and the ExternallyControlled executors.72// Notes on the implementation requirements:73// - it needs to be able to start and stop VUs in thread safe fashion74// - for each call to getVU there must be 1 (and only 1) call to returnVU75// - gracefulStop must let an iteration which has started to finish. For reasons of ease of76// implementation and lack of good evidence it's not required to let a not started iteration to77// finish in other words if you call start and then gracefulStop, there is no requirement for78// 1 iteration to have been started.79// - hardStop must stop an iteration in process80// - it's not required but preferable, if where possible to not reactivate VUs and to reuse context81// as this speed ups the execution82type vuHandle struct {83 mutex *sync.Mutex84 parentCtx context.Context85 getVU func() (lib.InitializedVU, error)86 returnVU func(lib.InitializedVU)87 nextIterationCounters func() (uint64, uint64)88 config *BaseConfig89 initVU lib.InitializedVU90 activeVU lib.ActiveVU91 canStartIter chan struct{}92 state stateType // see the table above for meanings93 // stateH []int32 // helper for debugging94 ctx context.Context95 cancel func()96 logger *logrus.Entry97}98func newStoppedVUHandle(99 parentCtx context.Context, getVU func() (lib.InitializedVU, error),100 returnVU func(lib.InitializedVU),101 nextIterationCounters func() (uint64, uint64),102 config *BaseConfig, logger *logrus.Entry,103) *vuHandle {104 ctx, cancel := context.WithCancel(parentCtx)105 return &vuHandle{106 mutex: &sync.Mutex{},107 parentCtx: parentCtx,108 getVU: getVU,109 nextIterationCounters: nextIterationCounters,110 config: config,111 canStartIter: make(chan struct{}),112 state: stopped,113 ctx: ctx,114 cancel: cancel,115 logger: logger,116 returnVU: returnVU,117 }118}119func (vh *vuHandle) start() (err error) {120 vh.mutex.Lock()121 defer vh.mutex.Unlock()122 switch vh.state {123 case starting, running:124 return nil // nothing to do125 case toGracefulStop: // we raced with the loop, lets not return the vu just to get it back126 vh.logger.Debug("Start")127 close(vh.canStartIter)128 vh.changeState(running)129 case stopped, toHardStop: // we need to reactivate the VU and remake the context for it130 vh.logger.Debug("Start")131 vh.initVU, err = vh.getVU()132 if err != nil {133 return err134 }135 vh.activeVU = vh.initVU.Activate(getVUActivationParams(136 vh.ctx, *vh.config, vh.returnVU, vh.nextIterationCounters))137 close(vh.canStartIter)138 vh.changeState(starting)139 }140 return nil141}142// just a helper function for debugging143func (vh *vuHandle) changeState(newState stateType) {144 // vh.stateH = append(vh.stateH, newState)145 atomic.StoreInt32((*int32)(&vh.state), int32(newState))146}147func (vh *vuHandle) gracefulStop() {148 vh.mutex.Lock()149 defer vh.mutex.Unlock()150 switch vh.state {151 case toGracefulStop, toHardStop, stopped:152 return // nothing to do153 case starting: // we raced with the loop and apparently it won't do a single iteration154 vh.cancel()155 vh.ctx, vh.cancel = context.WithCancel(vh.parentCtx)156 vh.changeState(stopped)157 case running:158 vh.changeState(toGracefulStop)159 }160 vh.logger.Debug("Graceful stop")161 vh.canStartIter = make(chan struct{})162}163func (vh *vuHandle) hardStop() {164 vh.mutex.Lock()165 defer vh.mutex.Unlock()166 switch vh.state {167 case toHardStop, stopped:168 return // nothing to do169 case starting: // we raced with the loop and apparently it won't do a single iteration170 vh.changeState(stopped)171 case running, toGracefulStop:172 vh.changeState(toHardStop)173 }174 vh.logger.Debug("Hard stop")175 vh.cancel()176 vh.ctx, vh.cancel = context.WithCancel(vh.parentCtx)177 vh.canStartIter = make(chan struct{})178}179// runLoopsIfPossible is where all the fun is :D. Unfortunately somewhere we need to check most180// of the cases and this is where this happens.181func (vh *vuHandle) runLoopsIfPossible(runIter func(context.Context, lib.ActiveVU) bool) {182 // We can probably initialize here, but it's also easier to just use the slow path in the second183 // part of the for loop184 defer func() {185 // not sure if this is needed, because here the parentCtx is canceled and I would argue it doesn't matter186 // if we set the correct state187 vh.mutex.Lock()188 vh.changeState(stopped)189 vh.mutex.Unlock()190 }()191 var (192 executorDone = vh.parentCtx.Done()193 ctx context.Context194 cancel func()195 vu lib.ActiveVU196 )197 for {198 state := stateType(atomic.LoadInt32((*int32)(&vh.state)))199 if state == running && runIter(ctx, vu) { // fast path200 continue201 }202 // slow path - something has changed - get what and wait until we can do more iterations203 vh.mutex.Lock()204 select {205 case <-executorDone:206 // The whole executor is done, nothing more to do.207 vh.mutex.Unlock()208 return209 default:210 }211 switch vh.state {212 case running: // start raced us toGracefulStop213 vh.mutex.Unlock()214 continue215 case toGracefulStop:216 if cancel != nil {217 // we need to cancel the context, to return the vu218 // and because *we* did, lets reinitialize it219 cancel()220 vh.ctx, vh.cancel = context.WithCancel(vh.parentCtx)221 }222 fallthrough // to set the state223 case toHardStop:224 // we have *now* stopped225 vh.changeState(stopped)226 case stopped, starting:227 // there is nothing to do228 }229 canStartIter := vh.canStartIter230 ctx = vh.ctx231 vh.mutex.Unlock()232 // We're are stopped, but the executor isn't done yet, so we wait233 // for either one of those conditions.234 select {235 case <-canStartIter: // we can start again236 vh.mutex.Lock()237 select {238 case <-vh.canStartIter: // we check again in case of race239 // reinitialize240 vu, ctx, cancel = vh.activeVU, vh.ctx, vh.cancel241 vh.changeState(running)242 default:243 // well we got raced to here by something ... loop again ...244 }245 vh.mutex.Unlock()246 case <-ctx.Done():247 // hardStop was called, start a fresh iteration to get the new248 // context and signal channel249 case <-executorDone:250 // The whole executor is done, nothing more to do.251 return252 }253 }254}...

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hardStop

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1import (2func main() {3 runtime.ReadMemStats(&m)4 fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))5}6func bToMb(b uint64) uint64 {7}8import (9func main() {10 runtime.ReadMemStats(&m)11 fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))12}13func bToMb(b uint64) uint64 {14}15import (16func main() {17 runtime.ReadMemStats(&m)18 fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))19}20func bToMb(b uint64) uint64 {21}22import (23func main() {24 runtime.ReadMemStats(&m)25 fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))26}27func bToMb(b uint64) uint64 {28}29import (30func main() {31 runtime.ReadMemStats(&m)32 fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))33}34func bToMb(b uint64) uint64 {35}36import (37func main() {38 runtime.ReadMemStats(&m)39 fmt.Printf("Alloc = %v MiB", b

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hardStop

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1func main() {2 executor := NewExecutor()3 executor.Start()4 executor.hardStop()5}6func main() {7 executor := NewExecutor()8 executor.Start()9 executor.hardStop()10}11func main() {12 executor := NewExecutor()13 executor.Start()14 executor.hardStop()15}16func main() {17 executor := NewExecutor()18 executor.Start()19 executor.hardStop()20}21func main() {22 executor := NewExecutor()23 executor.Start()24 executor.hardStop()25}26func main() {27 executor := NewExecutor()28 executor.Start()29 executor.hardStop()30}31func main() {32 executor := NewExecutor()33 executor.Start()34 executor.hardStop()35}36func main() {37 executor := NewExecutor()38 executor.Start()39 executor.hardStop()40}41func main() {42 executor := NewExecutor()43 executor.Start()44 executor.hardStop()45}46func main() {47 executor := NewExecutor()48 executor.Start()49 executor.hardStop()50}51func main() {52 executor := NewExecutor()53 executor.Start()54 executor.hardStop()55}56func main() {57 executor := NewExecutor()58 executor.Start()59 executor.hardStop()60}61func main() {62 executor := NewExecutor()63 executor.Start()64 executor.hardStop()65}

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hardStop

Using AI Code Generation

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1import (2func main() {3 cmd := exec.Command("sleep", "100")4 err := cmd.Start()5 if err != nil {6 fmt.Println(err)7 os.Exit(1)8 }9 fmt.Printf("Waiting for command to finish...")10 time.Sleep(1 * time.Second)11 err = cmd.Process.Signal(syscall.SIGKILL)12 if err != nil {13 fmt.Println(err)14 os.Exit(1)15 }16 err = cmd.Wait()17 fmt.Printf("Command finished with error: %v", err)18}

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hardStop

Using AI Code Generation

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1func main() {2 e := NewExecutor()3 e.Start()4 e.HardStop()5}6func main() {7 e := NewExecutor()8 e.Start()9 e.HardStop()10}11func main() {12 e := NewExecutor()13 e.Start()14 e.HardStop()15}16func main() {17 e := NewExecutor()18 e.Start()19 e.HardStop()20}21func main() {22 e := NewExecutor()23 e.Start()24 e.HardStop()25}26func main() {27 e := NewExecutor()28 e.Start()29 e.HardStop()30}31func main() {32 e := NewExecutor()33 e.Start()34 e.HardStop()35}36func main() {37 e := NewExecutor()38 e.Start()39 e.HardStop()40}41func main() {42 e := NewExecutor()43 e.Start()44 e.HardStop()45}46func main() {47 e := NewExecutor()48 e.Start()49 e.HardStop()50}51func main() {52 e := NewExecutor()53 e.Start()54 e.HardStop()55}56func main() {57 e := NewExecutor()58 e.Start()59 e.HardStop()60}61func main() {62 e := NewExecutor()63 e.Start()64 e.HardStop()65}

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1import (2func main() {3 executor := NewExecutor(1)4 executor.Execute(func() {5 fmt.Println("hello")6 })7 executor.Execute(func() {8 fmt.Println("world")9 })10 executor.HardStop()11}12import (13func main() {14 executor := NewExecutor(1)15 executor.Execute(func() {16 fmt.Println("hello")17 })18 executor.Execute(func() {19 fmt.Println("world")20 })21 executor.SoftStop()22}23import (24func main() {25 executor := NewExecutor(1)26 executor.Execute(func() {27 fmt.Println("hello")28 })29 executor.Execute(func() {30 fmt.Println("world")31 })32 executor.HardStop()33}34import (35func main() {36 executor := NewExecutor(1)37 executor.Execute(func() {38 fmt.Println("hello")39 })40 executor.Execute(func() {41 fmt.Println("world")42 })43 executor.HardStop()44}45import (46func main() {47 executor := NewExecutor(1)48 executor.Execute(func() {49 fmt.Println("hello")50 })51 executor.Execute(func() {52 fmt.Println("world")53 })54 executor.HardStop()55}56import (57func main() {58 executor := NewExecutor(1)59 executor.Execute(func() {60 fmt.Println("hello")61 })62 executor.Execute(func() {63 fmt.Println("world")64 })65 executor.HardStop()66}67import (68func main() {69 executor := NewExecutor(1)70 executor.Execute(func() {71 fmt.Println("hello")72 })73 executor.Execute(func() {74 fmt.Println("world")75 })76 executor.HardStop()77}

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1import (2func main() {3 fmt.Println("Start")4 time.Sleep(10 * time.Second)5 fmt.Println("End")6}7In this program, we are using the time.Sleep() method to stop the execution of the program for 10 seconds. So, the output will be:8import (9func main() {10 fmt.Println("Start")11 hardStop()12 fmt.Println("End")13}14func hardStop() {15 time.Sleep(10 * time.Second)16}17In this program, we are using the time.Sleep() method to stop the execution of the program for 10 seconds. So, the output will be:

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1import (2func main() {3 executor := NewExecutor(2)4 task := NewTask(func() {5 fmt.Println("Executing")6 time.Sleep(5 * time.Second)7 fmt.Println("Done Executing")8 })9 executor.Submit(task)10 task.Wait()11 executor.HardStop()12}13main.(*executor).HardStop(0xc0000a6000)14main.main()15import (16func main() {17 executor := NewExecutor(2)18 task := NewTask(func() {19 fmt.Println("Executing")20 time.Sleep(5 * time.Second)21 fmt.Println("Done Executing")22 })23 executor.Submit(task)24 task.Wait()25 executor.HardStop()26}27import (

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1import (2type Executor struct {3 stop chan struct{}4 tasks []func()5}6func NewExecutor() *Executor {7 return &Executor{8 stop: make(chan struct{}),9 }10}11func (e *Executor) Submit(task func()) {12 e.mu.Lock()13 defer e.mu.Unlock()14 if e.stop == nil {15 }16 e.tasks = append(e.tasks, task)17}18func (e *Executor) Stop() {19 e.mu.Lock()20 defer e.mu.Unlock()21 if e.stop == nil {22 }23 close(e.stop)24}25func (e *Executor) Run() {26 for {27 var task func()28 e.mu.Lock()29 if len(e.tasks) > 0 {30 }31 e.mu.Unlock()32 if task == nil {33 }34 task()35 }36}37func (e *Executor) hardStop() {38 e.mu.Lock()39 defer e.mu.Unlock()40 if e.stop == nil {41 }42 close(e.stop)43}44func (e *Executor) Errors() []error {45 e.mu.Lock()46 defer e.mu.Unlock()47}48func (e *Executor) addError(err error) {49 e.mu.Lock()50 defer e.mu.Unlock()51 e.errors = append(e.errors, err)52}53func main() {54 e := NewExecutor()55 e.Submit(func() {56 fmt.Println("hello")57 })58 e.Submit(func() {59 fmt.Println("world")60 })61 e.hardStop()62 e.Run()63}64import (65type Executor struct {66 stop chan struct{}67 tasks []func()68}69func NewExecutor() *Executor {70 return &Executor{71 stop: make(chan struct{}),72 }73}74func (e *Executor) Submit(task func()) {75 e.mu.Lock()76 defer e.mu.Unlock()77 if e.stop == nil {78 }

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