chore: use 2*nbProc as default worker threads

Part-of: #4771

cli/src/main/java/io/kestra/cli/commands/servers/StandAloneCommand.java

@@ -40,8 +40,8 @@ public class StandAloneCommand extends AbstractServerCommand {
     @CommandLine.Option(names = {"-f", "--flow-path"}, description = "the flow path containing flow to inject at startup (when running with a memory flow repository)")
     private File flowPath;
 
-    @CommandLine.Option(names = {"--worker-thread"}, description = "the number of worker thread")
-    private Integer workerThread;
+    @CommandLine.Option(names = {"--worker-thread"}, description = "the number of worker threads, defaults to two times the number of available processors. Set it to 0 to avoid starting a worker.")
+    private int workerThread = Runtime.getRuntime().availableProcessors() * 2;
 
     @CommandLine.Option(names = {"--skip-executions"}, split=",", description = "a list of execution identifiers to skip, separated by a coma; for troubleshooting purpose only")
     private List<String> skipExecutions = Collections.emptyList();
@@ -99,9 +99,9 @@ public Integer call() throws Exception {
 
         StandAloneRunner standAloneRunner = applicationContext.getBean(StandAloneRunner.class);
 
-        if (this.workerThread != null  && this.workerThread == 0) {
+        if (this.workerThread == 0) {
             standAloneRunner.setWorkerEnabled(false);
-        } else if (this.workerThread != null) {
+        } else {
             standAloneRunner.setWorkerThread(this.workerThread);
         }
 

cli/src/main/java/io/kestra/cli/commands/servers/WorkerCommand.java

@@ -23,7 +23,7 @@ public class WorkerCommand extends AbstractServerCommand {
     @Inject
     private ApplicationContext applicationContext;
 
-    @CommandLine.Option(names = {"-t", "--thread"}, description = "the max number of concurrent threads to launch")
+    @CommandLine.Option(names = {"-t", "--thread"}, description = "the max number of worker threads, defaults to two times the number of available processors")
     private int thread = Runtime.getRuntime().availableProcessors() * 2;
 
     @CommandLine.Option(names = {"-g", "--worker-group"}, description = "the worker group key, must match the regex [a-zA-Z0-9_-]+ (EE only)")

docker-compose-dind.yml

@@ -41,7 +41,7 @@ services:
     pull_policy: always
     # Note that this is meant for development only. Refer to the documentation for production deployments of Kestra which runs without a root user.
     user: "root"
-    command: server standalone --worker-thread=128
+    command: server standalone
     volumes:
       - kestra-data:/app/storage
       - dind-socket:/dind

docker-compose.yml

@@ -22,11 +22,11 @@ services:
   kestra:
     image: kestra/kestra:latest
     pull_policy: always
-    # Note that this setup with a root user is intended for development purpose. 
+    # Note that this setup with a root user is intended for development purpose.
     # Our base image runs without root, but the Docker Compose implementation needs root to access the Docker socket
-    # To run Kestra in a rootless mode in production, see: https://kestra.io/docs/installation/podman-compose 
+    # To run Kestra in a rootless mode in production, see: https://kestra.io/docs/installation/podman-compose
     user: "root"
-    command: server standalone --worker-thread=128
+    command: server standalone
     volumes:
       - kestra-data:/app/storage
       - /var/run/docker.sock:/var/run/docker.sock