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Automation Advisor
K6
executor
runLoopsIfPossible

How to use runLoopsIfPossible method of executor Package

Best K6 code snippet using executor.runLoopsIfPossible

vu_handle.go

Source:vu_handle.go

...37/*38the below is a state transition table (https://en.wikipedia.org/wiki/State-transition_table)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.ActiveVU...

runLoopsIfPossible

Using AI Code Generation

1import (2func main() {3    fmt.Println("start")4    time.Sleep(2 * time.Second)5    fmt.Println("end")6}7import (8func main() {9    fmt.Println("start")10    time.Sleep(2 * time.Second)11    fmt.Println("end")12}13import (14func main() {15    fmt.Println("start")16    time.Sleep(2 * time.Second)17    fmt.Println("end")18}19import (20func main() {21    fmt.Println("start")22    time.Sleep(2 * time.Second)23    fmt.Println("end")24}25import (26func main() {27    fmt.Println("start")28    time.Sleep(2 * time.Second)29    fmt.Println("end")30}31import (32func main() {33    fmt.Println("start")34    time.Sleep(2 * time.Second)35    fmt.Println("end")36}37import (38func main() {39    fmt.Println("start")40    time.Sleep(2 * time.Second)41    fmt.Println("end")42}43import (44func main() {45    fmt.Println("start")46    time.Sleep(2 * time.Second)47    fmt.Println("end")48}49import (

runLoopsIfPossible

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Hello, playground")4    executor := new(Executor)5    executor.runLoopsIfPossible()6}7import "fmt"8func main() {9    fmt.Println("Hello, playground")10    executor := new(Executor)11    executor.runLoopsIfPossible()12}13import "fmt"14func main() {15    fmt.Println("Hello, playground")16    executor := new(Executor)17    executor.runLoopsIfPossible()18}19import "fmt"20func main() {21    fmt.Println("Hello, playground")22    executor := new(Executor)23    executor.runLoopsIfPossible()24}25import "fmt"26func main() {27    fmt.Println("Hello, playground")28    executor := new(Executor)29    executor.runLoopsIfPossible()30}31import "fmt"32func main() {33    fmt.Println("Hello, playground")34    executor := new(Executor)35    executor.runLoopsIfPossible()36}37import "fmt"38func main() {39    fmt.Println("Hello, playground")40    executor := new(Executor)41    executor.runLoopsIfPossible()42}43import "fmt"44func main() {45    fmt.Println("Hello, playground")46    executor := new(Executor)47    executor.runLoopsIfPossible()48}49import "fmt"50func main() {51    fmt.Println("Hello, playground")52    executor := new(Executor)53    executor.runLoopsIfPossible()54}

runLoopsIfPossible

Using AI Code Generation

1import (2func main() {3	executor := Executor{}4	executor.runLoopsIfPossible()5}6type Executor struct {7}8func (executor Executor) runLoopsIfPossible() {9	numberOfProcessors := runtime.NumCPU()10	runtime.GOMAXPROCS(numberOfProcessors)11	channel := make(chan string)12	for i := 1; i <= 10; i++ {13		go func(channel chan string, i int) {14			channel <- fmt.Sprintf("Hello %d", i)15		}(channel, i)16	}17	for i := 1; i <= 10; i++ {18		fmt.Println(<-channel)19	}20}

runLoopsIfPossible

Using AI Code Generation

1import (2func main() {3	fmt.Println("Calling the runLoopsIfPossible method")4	executor := Executor{}5	executor.runLoopsIfPossible()6}7import (8type Executor struct {9}10func (executor *Executor) runLoopsIfPossible() {11	fmt.Println("Calling the runLoopsIfPossible method")12	for i := 0; i < 10; i++ {13		go func() {14			fmt.Println("Hello World")15		}()16	}17	time.Sleep(1 * time.Second)18}19import (20type Executor struct {21}22func (executor *Executor) runLoopsIfPossible() {23	fmt.Println("Calling the runLoopsIfPossible method")24	for i := 0; i < 10; i++ {25		go func() {26			fmt.Println("Hello World")27		}()28	}29	time.Sleep(1 * time.Second)30}31import (32type Executor struct {33}34func (executor *Executor) runLoopsIfPossible() {35	fmt.Println("Calling the runLoopsIfPossible method")36	for i := 0; i < 10; i++ {37		go func() {38			fmt.Println("Hello World")39		}()40	}41	time.Sleep(1 * time.Second)42}43import (44type Executor struct {45}46func (executor *Executor) runLoopsIfPossible() {47	fmt.Println("Calling the runLoopsIfPossible method")48	for i := 0; i < 10; i++ {49		go func() {50			fmt.Println("Hello World")51		}()52	}53	time.Sleep(1 * time.Second)54}

runLoopsIfPossible

Using AI Code Generation

1import (2func main() {3	executor := runtime.GOMAXPROCS(2)4	fmt.Println("Number of threads:", executor)5	go func() {6		fmt.Println("Hello, World!")7	}()8	runtime.Goexit()9}10import (11func main() {12	executor := runtime.GOMAXPROCS(2)13	fmt.Println("Number of threads:", executor)14	go func() {15		fmt.Println("Hello, World!")16	}()17	runtime.Gosched()18}

runLoopsIfPossible

Using AI Code Generation

1import (2func main() {3	fmt.Println("Number of cpu cores: ", runtime.NumCPU())4	fmt.Println("Number of goroutines: ", runtime.NumGoroutine())5	for i := 0; i < 10; i++ {6		go func() {7			for j := 0; j < 10; j++ {8				fmt.Println("j: ", j)9			}10		}()11	}12	fmt.Println("Number of goroutines: ", runtime.NumGoroutine())13}

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