diff --git a/.travis.yml b/.travis.yml index e09b501..be99e0e 100644 --- a/.travis.yml +++ b/.travis.yml @@ -10,6 +10,7 @@ go: - 1.12.x - 1.13.x - 1.14.x + - 1.15.x # Enable Go Modules env: diff --git a/README.md b/README.md index a28d59d..cc00e00 100644 --- a/README.md +++ b/README.md @@ -32,6 +32,7 @@ Some common scenarios include: - Supports Non-blocking and Blocking task submission modes (buffered / unbuffered) - Very high performance and efficient resource usage under heavy workloads, even outperforming unbounded goroutines in some scenarios (See [benchmarks](./benchmark/README.md)) - **New (since v1.3.0)**: configurable pool resizing strategy, with 3 presets for common scenarios: Eager, Balanced and Lazy. +- **New (since v1.5.0)**: complete pool metrics such as number of running workers, tasks waiting in the queue [and more](#metrics--monitoring). - [API reference](https://pkg.go.dev/github.com/alitto/pond) ## How to install @@ -176,6 +177,23 @@ The following chart illustrates the behaviour of the different pool resizing str As the name suggests, the "Eager" strategy always spawns an extra worker when there are no idles, which causes the pool to grow almost linearly with the number of submitted tasks. On the other end, the "Lazy" strategy creates one worker every N submitted tasks, where N is the maximum number of available CPUs ([GOMAXPROCS](https://golang.org/pkg/runtime/#GOMAXPROCS)). The "Balanced" strategy represents a middle ground between the previous two because it creates a worker every N/2 submitted tasks. +### Metrics & monitoring + +Each worker pool instance exposes useful metrics that can be queried through the following methods: + +- `pool.RunningWorkers() int`: Current number of running workers +- `pool.IdleWorkers() int`: Current number of idle workers +- `pool.MinWorkers() int`: Minimum number of worker goroutines +- `pool.MaxWorkers() int`: Maxmimum number of worker goroutines +- `pool.MaxCapacity() int`: Maximum number of tasks that can be waiting in the queue at any given time (queue capacity) +- `pool.SubmittedTasks() uint64`: Total number of tasks submitted since the pool was created +- `pool.WaitingTasks() uint64`: Current number of tasks in the queue that are waiting to be executed +- `pool.SuccessfulTasks() uint64`: Total number of tasks that have successfully completed their exection since the pool was created +- `pool.FailedTasks() uint64`: Total number of tasks that completed with panic since the pool was created +- `pool.CompletedTasks() uint64`: Total number of tasks that have completed their exection either successfully or with panic since the pool was created + +In our [Prometheus example](./examples/prometheus/prometheus.go) we showcase how to configure collectors for these metrics and expose them to Prometheus. + ## API Reference Full API reference is available at https://pkg.go.dev/github.com/alitto/pond diff --git a/examples/dynamic_size/go.mod b/examples/dynamic_size/go.mod index 00f8792..4413459 100644 --- a/examples/dynamic_size/go.mod +++ b/examples/dynamic_size/go.mod @@ -1,9 +1,9 @@ module github.com/alitto/pond/examples/dynamic_size -go 1.14 +go 1.15 require ( - github.com/alitto/pond v1.3.0 + github.com/alitto/pond v1.5.0 ) replace github.com/alitto/pond => ../../ diff --git a/examples/fixed_size/go.mod b/examples/fixed_size/go.mod index 51566e3..8910c4d 100644 --- a/examples/fixed_size/go.mod +++ b/examples/fixed_size/go.mod @@ -1,9 +1,9 @@ module github.com/alitto/pond/examples/fixed_size -go 1.14 +go 1.15 require ( - github.com/alitto/pond v1.3.0 + github.com/alitto/pond v1.5.0 ) replace github.com/alitto/pond => ../../ diff --git a/examples/prometheus/go.mod b/examples/prometheus/go.mod new file mode 100644 index 0000000..0ac4656 --- /dev/null +++ b/examples/prometheus/go.mod @@ -0,0 +1,10 @@ +module github.com/alitto/pond/examples/fixed_size + +go 1.15 + +require ( + github.com/alitto/pond v1.5.0 + github.com/prometheus/client_golang v1.9.0 +) + +replace github.com/alitto/pond => ../../ diff --git a/examples/prometheus/go.sum b/examples/prometheus/go.sum new file mode 100644 index 0000000..94b6a13 --- /dev/null +++ b/examples/prometheus/go.sum @@ -0,0 +1,400 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod 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"net/http" + "time" + + "github.com/alitto/pond" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" +) + +func main() { + + // Create a worker pool + pool := pond.New(10, 100) + + // Register pool metrics collectors + + // Worker pool metrics + prometheus.MustRegister(prometheus.NewGaugeFunc( + prometheus.GaugeOpts{ + Name: "pool_workers_running", + Help: "Number of running worker goroutines", + }, + func() float64 { + return float64(pool.RunningWorkers()) + })) + prometheus.MustRegister(prometheus.NewGaugeFunc( + prometheus.GaugeOpts{ + Name: "pool_workers_idle", + Help: "Number of idle worker goroutines", + }, + func() float64 { + return float64(pool.IdleWorkers()) + })) + + // Task metrics + prometheus.MustRegister(prometheus.NewCounterFunc( + prometheus.CounterOpts{ + Name: "pool_tasks_submitted_total", + Help: "Number of tasks submitted", + }, + func() float64 { + return float64(pool.SubmittedTasks()) + })) + prometheus.MustRegister(prometheus.NewGaugeFunc( + prometheus.GaugeOpts{ + Name: "pool_tasks_waiting_total", + Help: "Number of tasks waiting in the queue", + }, + func() float64 { + return float64(pool.WaitingTasks()) + })) + prometheus.MustRegister(prometheus.NewCounterFunc( + prometheus.CounterOpts{ + Name: "pool_tasks_successful_total", + Help: "Number of tasks that completed successfully", + }, + func() float64 { + return float64(pool.SuccessfulTasks()) + })) + prometheus.MustRegister(prometheus.NewCounterFunc( + prometheus.CounterOpts{ + Name: "pool_tasks_failed_total", + Help: "Number of tasks that completed with panic", + }, + func() float64 { + return float64(pool.FailedTasks()) + })) + prometheus.MustRegister(prometheus.NewCounterFunc( + prometheus.CounterOpts{ + Name: "pool_tasks_completed_total", + Help: "Number of tasks that completed either successfully or with panic", + }, + func() float64 { + return float64(pool.CompletedTasks()) + })) + + // Expose the registered metrics via HTTP + http.Handle("/metrics", promhttp.Handler()) + + go submitTasks(pool) + + // Start the server + http.ListenAndServe(":8080", nil) + +} + +func submitTasks(pool *pond.WorkerPool) { + + // Submit 1000 tasks + for i := 0; i < 1000; i++ { + n := i + pool.Submit(func() { + fmt.Printf("Running task #%d\n", n) + time.Sleep(500 * time.Millisecond) + }) + } +} diff --git a/examples/task_group/go.mod b/examples/task_group/go.mod index fd4fcad..008ecad 100644 --- a/examples/task_group/go.mod +++ b/examples/task_group/go.mod @@ -1,9 +1,9 @@ module github.com/alitto/pond/examples/task_group -go 1.14 +go 1.15 require ( - github.com/alitto/pond v1.3.0 + github.com/alitto/pond v1.5.0 ) replace github.com/alitto/pond => ../../ diff --git a/go.mod b/go.mod index f05cdfc..7a4931c 100644 --- a/go.mod +++ b/go.mod @@ -1,3 +1,3 @@ module github.com/alitto/pond -go 1.14 +go 1.15 diff --git a/pond.go b/pond.go index fcef968..aebc61c 100644 --- a/pond.go +++ b/pond.go @@ -65,8 +65,12 @@ type WorkerPool struct { strategy ResizingStrategy panicHandler func(interface{}) // Atomic counters - workerCount int32 - idleWorkerCount int32 + workerCount int32 + idleWorkerCount int32 + waitingTaskCount uint64 + submittedTaskCount uint64 + successfulTaskCount uint64 + failedTaskCount uint64 // Private properties tasks chan func() purgerQuit chan struct{} @@ -131,16 +135,64 @@ func New(maxWorkers, maxCapacity int, options ...Option) *WorkerPool { return pool } -// Running returns the number of running workers -func (p *WorkerPool) Running() int { +// RunningWorkers returns the current number of running workers +func (p *WorkerPool) RunningWorkers() int { return int(atomic.LoadInt32(&p.workerCount)) } -// Idle returns the number of idle workers -func (p *WorkerPool) Idle() int { +// IdleWorkers returns the current number of idle workers +func (p *WorkerPool) IdleWorkers() int { return int(atomic.LoadInt32(&p.idleWorkerCount)) } +// MinWorkers returns the minimum number of worker goroutines +func (p *WorkerPool) MinWorkers() int { + return p.minWorkers +} + +// MaxWorkers returns the maximum number of worker goroutines +func (p *WorkerPool) MaxWorkers() int { + return p.maxWorkers +} + +// MaxCapacity returns the maximum number of tasks that can be waiting in the queue +// at any given time (queue size) +func (p *WorkerPool) MaxCapacity() int { + return p.maxCapacity +} + +// Strategy returns the configured pool resizing strategy +func (p *WorkerPool) Strategy() ResizingStrategy { + return p.strategy +} + +// SubmittedTasks returns the total number of tasks submitted since the pool was created +func (p *WorkerPool) SubmittedTasks() uint64 { + return atomic.LoadUint64(&p.submittedTaskCount) +} + +// WaitingTasks returns the current number of tasks in the queue that are waiting to be executed +func (p *WorkerPool) WaitingTasks() uint64 { + return atomic.LoadUint64(&p.waitingTaskCount) +} + +// SuccessfulTasks returns the total number of tasks that have successfully completed their exection +// since the pool was created +func (p *WorkerPool) SuccessfulTasks() uint64 { + return atomic.LoadUint64(&p.successfulTaskCount) +} + +// FailedTasks returns the total number of tasks that completed with panic since the pool was created +func (p *WorkerPool) FailedTasks() uint64 { + return atomic.LoadUint64(&p.failedTaskCount) +} + +// CompletedTasks returns the total number of tasks that have completed their exection either successfully +// or with panic since the pool was created +func (p *WorkerPool) CompletedTasks() uint64 { + return p.SuccessfulTasks() + p.FailedTasks() +} + // Submit sends a task to this worker pool for execution. If the queue is full, // it will wait until the task is dispatched to a worker goroutine. func (p *WorkerPool) Submit(task func()) { @@ -154,38 +206,58 @@ func (p *WorkerPool) TrySubmit(task func()) bool { return p.submit(task, false) } -func (p *WorkerPool) submit(task func(), waitForIdle bool) bool { +func (p *WorkerPool) submit(task func(), canWaitForIdleWorker bool) (submitted bool) { if task == nil { return false } - runningWorkerCount := p.Running() + defer func() { + if submitted { + // Increment submitted task count + atomic.AddUint64(&p.submittedTaskCount, 1) + + // Increment waiting task count + atomic.AddUint64(&p.waitingTaskCount, 1) + } + }() + + runningWorkerCount := p.RunningWorkers() // Attempt to dispatch to an idle worker without blocking - if runningWorkerCount > 0 && p.Idle() > 0 { + if runningWorkerCount > 0 && p.IdleWorkers() > 0 { select { case p.tasks <- task: - return true + submitted = true + return default: // No idle worker available, continue } } - maxWorkersReached := runningWorkerCount >= p.maxWorkers - - // Exit if we have reached the max. number of workers and can't wait for an idle worker - if maxWorkersReached && !waitForIdle { - return false + // Start a worker as long as we haven't reached the limit + if runningWorkerCount < p.maxWorkers { + if ok := p.maybeStartWorker(task); ok { + submitted = true + return + } } - // Start a worker as long as we haven't reached the limit - if ok := p.maybeStartWorker(task); ok { - return true + if !canWaitForIdleWorker { + select { + case p.tasks <- task: + submitted = true + return + default: + // Channel is full and can't wait for an idle worker, so need to exit + submitted = false + return + } } // Submit the task to the tasks channel and wait for it to be picked up by a worker p.tasks <- task - return true + submitted = true + return } // SubmitAndWait sends a task to this worker pool for execution and waits for it to complete @@ -251,7 +323,7 @@ Purge: select { // Timed out waiting for any activity to happen, attempt to kill an idle worker case <-idleTicker.C: - if p.Idle() > 0 && p.Running() > p.minWorkers { + if p.IdleWorkers() > 0 && p.RunningWorkers() > p.minWorkers { p.tasks <- nil } case <-p.purgerQuit: @@ -273,16 +345,38 @@ func (p *WorkerPool) maybeStartWorker(firstTask func()) bool { } // Launch worker - go worker(firstTask, p.tasks, &p.idleWorkerCount, p.decrementWorkerCount, p.panicHandler) + go worker(firstTask, p.tasks, &p.idleWorkerCount, p.decrementWorkerCount, p.executeTask) return true } +// executeTask executes the given task and updates task-related counters +func (p *WorkerPool) executeTask(task func()) { + + defer func() { + if panic := recover(); panic != nil { + // Increment failed task count + atomic.AddUint64(&p.failedTaskCount, 1) + + // Invoke panic handler + p.panicHandler(panic) + } + }() + + // Decrement waiting task count + atomic.AddUint64(&p.waitingTaskCount, ^uint64(0)) + + task() + + // Increment successful task count + atomic.AddUint64(&p.successfulTaskCount, 1) +} + func (p *WorkerPool) incrementWorkerCount() bool { // Attempt to increment worker count p.mutex.Lock() - runningWorkerCount := p.Running() + runningWorkerCount := p.RunningWorkers() // Execute the resizing strategy to determine if we can create more workers if !p.strategy.Resize(runningWorkerCount, p.minWorkers, p.maxWorkers) || runningWorkerCount >= p.maxWorkers { p.mutex.Unlock() @@ -316,28 +410,19 @@ func (p *WorkerPool) Group() *TaskGroup { } // worker launches a worker goroutine -func worker(firstTask func(), tasks chan func(), idleWorkerCount *int32, exitHandler func(), panicHandler func(interface{})) { +func worker(firstTask func(), tasks chan func(), idleWorkerCount *int32, exitHandler func(), taskExecutor func(func())) { defer func() { + // Decrement idle count + atomic.AddInt32(idleWorkerCount, -1) - if panic := recover(); panic != nil { - // Handle panic - panicHandler(panic) - - // Restart goroutine - go worker(nil, tasks, idleWorkerCount, exitHandler, panicHandler) - } else { - // Decrement idle count - atomic.AddInt32(idleWorkerCount, -1) - - // Handle normal exit - exitHandler() - } + // Handle normal exit + exitHandler() }() // We have received a task, execute it if firstTask != nil { - firstTask() + taskExecutor(firstTask) } // Increment idle count atomic.AddInt32(idleWorkerCount, 1) @@ -352,7 +437,7 @@ func worker(firstTask func(), tasks chan func(), idleWorkerCount *int32, exitHan atomic.AddInt32(idleWorkerCount, -1) // We have received a task, execute it - task() + taskExecutor(task) // Increment idle count atomic.AddInt32(idleWorkerCount, 1) diff --git a/pond_blackbox_test.go b/pond_blackbox_test.go index c1a7b5a..d0311e5 100644 --- a/pond_blackbox_test.go +++ b/pond_blackbox_test.go @@ -16,6 +16,13 @@ func assertEqual(t *testing.T, expected interface{}, actual interface{}) { } } +func assertNotEqual(t *testing.T, expected interface{}, actual interface{}) { + if expected == actual { + t.Helper() + t.Errorf("Expected not equal to %T(%v) but was %T(%v)", expected, expected, actual, actual) + } +} + func TestSubmitAndStopWaiting(t *testing.T) { pool := pond.New(1, 5) @@ -97,7 +104,7 @@ func TestSubmitWithNilTask(t *testing.T) { // Wait until all submitted tasks complete pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) } func TestSubmitAndWait(t *testing.T) { @@ -125,7 +132,7 @@ func TestSubmitAndWaitWithNilTask(t *testing.T) { // Wait until all submitted tasks complete pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) } func TestSubmitBefore(t *testing.T) { @@ -161,12 +168,12 @@ func TestSubmitBeforeWithNilTask(t *testing.T) { // Wait until all submitted tasks complete pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) } func TestTrySubmit(t *testing.T) { - pool := pond.New(1, 5) + pool := pond.New(1, 0) // Submit a long-running task var doneCount int32 @@ -199,8 +206,8 @@ func TestSubmitToIdle(t *testing.T) { time.Sleep(1 * time.Millisecond) }) - assertEqual(t, int(1), pool.Running()) - assertEqual(t, int(1), pool.Idle()) + assertEqual(t, int(1), pool.RunningWorkers()) + assertEqual(t, int(1), pool.IdleWorkers()) // Submit another task (this one should go to the idle worker) pool.SubmitAndWait(func() { @@ -209,8 +216,8 @@ func TestSubmitToIdle(t *testing.T) { pool.StopAndWait() - assertEqual(t, int(0), pool.Running()) - assertEqual(t, int(0), pool.Idle()) + assertEqual(t, int(0), pool.RunningWorkers()) + assertEqual(t, int(0), pool.IdleWorkers()) } func TestRunning(t *testing.T) { @@ -219,7 +226,7 @@ func TestRunning(t *testing.T) { taskCount := 10 pool := pond.New(workerCount, taskCount) - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) // Submit tasks var started = make(chan struct{}, workerCount) @@ -237,7 +244,7 @@ func TestRunning(t *testing.T) { <-started } - assertEqual(t, workerCount, pool.Running()) + assertEqual(t, workerCount, pool.RunningWorkers()) time.Sleep(1 * time.Millisecond) // Make sure half the tasks tasks complete @@ -257,13 +264,13 @@ func TestRunning(t *testing.T) { pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) } func TestSubmitWithPanic(t *testing.T) { pool := pond.New(1, 5) - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) // Submit a task that panics var doneCount int32 @@ -281,7 +288,7 @@ func TestSubmitWithPanic(t *testing.T) { pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) assertEqual(t, int32(1), atomic.LoadInt32(&doneCount)) } @@ -302,7 +309,7 @@ func TestPoolWithCustomIdleTimeout(t *testing.T) { started <- true // There should be 1 worker running - assertEqual(t, 1, pool.Running()) + assertEqual(t, 1, pool.RunningWorkers()) // Let the task complete completed <- true @@ -311,7 +318,7 @@ func TestPoolWithCustomIdleTimeout(t *testing.T) { time.Sleep(10 * time.Millisecond) // Worker should have been killed - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) pool.StopAndWait() } @@ -351,19 +358,19 @@ func TestPoolWithCustomMinWorkers(t *testing.T) { started <- struct{}{} // 10 workers should have been started - assertEqual(t, 10, pool.Running()) + assertEqual(t, 10, pool.RunningWorkers()) <-completed pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) } func TestGroupSubmit(t *testing.T) { pool := pond.New(5, 1000) - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) // Submit groups of tasks var doneCount, taskCount int32 @@ -404,9 +411,49 @@ func TestPoolWithCustomStrategy(t *testing.T) { group.Wait() // 2 workers should have been started - assertEqual(t, 2, pool.Running()) + assertEqual(t, 2, pool.RunningWorkers()) pool.StopAndWait() - assertEqual(t, 0, pool.Running()) + assertEqual(t, 0, pool.RunningWorkers()) +} + +func TestMetricsAndGetters(t *testing.T) { + + pool := pond.New(5, 10) + assertEqual(t, 0, pool.RunningWorkers()) + + // Submit successful tasks + for i := 0; i < 18; i++ { + pool.TrySubmit(func() { + time.Sleep(5 * time.Millisecond) + }) + } + + // Submit a task that panics + pool.Submit(func() { + arr := make([]string, 0) + fmt.Printf("Out of range value: %s", arr[1]) + }) + + // Submit another successful task + pool.Submit(func() { + time.Sleep(1 * time.Millisecond) + }) + + // Submit a nil task (it should not update counters) + pool.Submit(nil) + + pool.StopAndWait() + + assertEqual(t, 0, pool.RunningWorkers()) + assertEqual(t, 0, pool.MinWorkers()) + assertEqual(t, 5, pool.MaxWorkers()) + assertEqual(t, 10, pool.MaxCapacity()) + assertNotEqual(t, nil, pool.Strategy()) + assertEqual(t, uint64(17), pool.SubmittedTasks()) + assertEqual(t, uint64(16), pool.SuccessfulTasks()) + assertEqual(t, uint64(1), pool.FailedTasks()) + assertEqual(t, uint64(17), pool.CompletedTasks()) + assertEqual(t, uint64(0), pool.WaitingTasks()) }