backend: add parameter to launch a number of generation workers

backend/generation.go

@@ -28,6 +28,7 @@ type genStruct struct {
 	Type GenerateType
 }
 
+var parallelJobs = runtime.NumCPU()
 var genTeamQueue chan *fic.Team
 var genQueue chan genStruct
 var inQueueMutex sync.RWMutex
@@ -37,8 +38,11 @@ func init() {
 	genTeamQueue = make(chan *fic.Team)
 	genQueue = make(chan genStruct)
 	inGenQueue = map[GenerateType]bool{}
+}
 
-	for i := runtime.NumCPU(); i > 0; i-- {
+func launchWorkers() {
+	log.Println("Running with", parallelJobs, "worker(s)")
+	for i := parallelJobs; i > 0; i-- {
 		go consumer()
 	}
 }