optimizer: add parallel local process worker support for optimizer

config/pivotshort_optimizer.yaml

@@ -10,12 +10,12 @@ matrix:
   path: '/exchangeStrategies/0/pivotshort/interval'
   values: [ "1m", "5m", "30m" ]
 
-#- type: range
-#  path: '/exchangeStrategies/0/pivotshort/pivotLength'
-#  label: pivotLength
-#  min: 100.0
-#  max: 200.0
-#  step: 20.0
+- type: range
+  path: '/exchangeStrategies/0/pivotshort/window'
+  label: window
+  min: 100.0
+  max: 200.0
+  step: 20.0
 
 #  - type: range
 #    path: '/exchangeStrategies/0/pivotshort/breakLow/stopEMARange'

pkg/optimizer/grid.go

@@ -1,6 +1,7 @@
 package optimizer
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"sort"
@@ -170,26 +171,17 @@ func (o *GridOptimizer) Run(executor Executor, configJson []byte) (map[string][]
 	var metrics = map[string][]Metric{}
 
 	var ops = o.buildOps()
+
+	var taskC = make(chan BacktestTask, 100)
+
 	var app = func(configJson []byte, next func(configJson []byte) error) error {
-		summaryReport, err := executor.Execute(configJson)
-		if err != nil {
-			return err
-		}
-
 		var labels = copyLabels(o.ParamLabels)
-		var currentParams = copyParams(o.CurrentParams)
-		for metricName, metricFunc := range valueFunctions {
-			var metricValue = metricFunc(summaryReport)
-
-			metrics[metricName] = append(metrics[metricName], Metric{
-				Params: currentParams,
+		var params = copyParams(o.CurrentParams)
+		taskC <- BacktestTask{
+			ConfigJson: configJson,
+			Params:     params,
 			Labels:     labels,
-				Value:  metricValue,
-			})
-
-			log.Infof("params: %+v => %s %+v", currentParams, metricName, metricValue)
 		}
-
 		return nil
 	}
 
@@ -207,7 +199,27 @@ func (o *GridOptimizer) Run(executor Executor, configJson []byte) (map[string][]
 		}
 	}
 
-	err := wrapper(configJson)
+	resultsC, err := executor.Run(context.Background(), taskC)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := wrapper(configJson); err != nil {
+		return nil, err
+	}
+	close(taskC) // this will shut down the executor
+
+	for result := range resultsC {
+		for metricName, metricFunc := range valueFunctions {
+			var metricValue = metricFunc(result.Report)
+			log.Infof("params: %+v => %s %+v", result.Params, metricName, metricValue)
+			metrics[metricName] = append(metrics[metricName], Metric{
+				Params: result.Params,
+				Labels: result.Labels,
+				Value:  metricValue,
+			})
+		}
+	}
 
 	for n := range metrics {
 		sort.Slice(metrics[n], func(i, j int) bool {

pkg/optimizer/local.go

@@ -1,10 +1,12 @@
 package optimizer
 
 import (
+	"context"
 	"encoding/json"
 	"os"
 	"os/exec"
 	"strings"
+	"sync"
 
 	"github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v3"
@@ -14,8 +16,17 @@ import (
 
 var log = logrus.WithField("component", "optimizer")
 
+type BacktestTask struct {
+	ConfigJson []byte
+	Params     []interface{}
+	Labels     []string
+	Report     *backtest.SummaryReport
+	Error      error
+}
+
 type Executor interface {
-	Execute(configJson []byte) (*backtest.SummaryReport, error)
+	// Execute(configJson []byte) (*backtest.SummaryReport, error)
+	Run(ctx context.Context, taskC chan BacktestTask) (chan BacktestTask, error)
 }
 
 type AsyncHandle struct {
@@ -38,7 +49,7 @@ func (e *LocalProcessExecutor) ExecuteAsync(configJson []byte) *AsyncHandle {
 
 	go func() {
 		defer close(handle.Done)
-		report, err := e.Execute(configJson)
+		report, err := e.execute(configJson)
 		handle.Error = err
 		handle.Report = report
 	}()
@@ -61,7 +72,57 @@ func (e *LocalProcessExecutor) readReport(output []byte) (*backtest.SummaryRepor
 	return summaryReport, nil
 }
 
-func (e *LocalProcessExecutor) Execute(configJson []byte) (*backtest.SummaryReport, error) {
+func (e *LocalProcessExecutor) Run(ctx context.Context, taskC chan BacktestTask) (chan BacktestTask, error) {
+	var maxNumOfProcess = 5
+	var resultsC = make(chan BacktestTask, 10)
+
+	wg := sync.WaitGroup{}
+	wg.Add(maxNumOfProcess)
+
+	go func() {
+		wg.Wait()
+		close(resultsC)
+	}()
+
+	for i := 0; i < maxNumOfProcess; i++ {
+		// fork workers
+		go func(id int, taskC chan BacktestTask) {
+			taskCnt := 0
+			log.Infof("starting local worker #%d", id)
+			defer wg.Done()
+			for {
+				select {
+				case <-ctx.Done():
+					return
+
+				case task, ok := <-taskC:
+					if !ok {
+						return
+					}
+
+					taskCnt++
+					log.Infof("local worker #%d received param task: %v", id, task.Params)
+
+					report, err := e.execute(task.ConfigJson)
+					if err != nil {
+						log.WithError(err).Errorf("execute error")
+					}
+
+					task.Error = err
+					task.Report = report
+
+					resultsC <- task
+				}
+			}
+		}(i+1, taskC)
+	}
+
+	return resultsC, nil
+}
+
+// execute runs the config json and returns the summary report
+// this is a blocking operation
+func (e *LocalProcessExecutor) execute(configJson []byte) (*backtest.SummaryReport, error) {
 	tf, err := jsonToYamlConfig(e.ConfigDir, configJson)
 	if err != nil {
 		return nil, err

utils/embed/main.go

@@ -90,7 +90,7 @@ func (f *file) Sys() interface{} { return nil }
 func Embed(file string, dirs ...string) error {
 	var buf bytes.Buffer
 
-	// Execute template
+	// execute template
 	if err := tmpl.Execute(&buf, struct {
 		Package string
 		Tag     string