diff --git a/swh/scheduler/celery_backend/runner.py b/swh/scheduler/celery_backend/runner.py
--- a/swh/scheduler/celery_backend/runner.py
+++ b/swh/scheduler/celery_backend/runner.py
@@ -4,11 +4,12 @@
 # See top-level LICENSE file for more information
 
 import arrow
+import logging
 
 from swh.scheduler import get_scheduler, compute_nb_tasks_from
-from .config import app as main_app
 
 
+logger = logging.getLogger(__name__)
 # Max batch size for tasks
 MAX_NUM_TASKS = 10000
 
@@ -64,12 +65,15 @@
                 num_tasks, num_tasks_priority = compute_nb_tasks_from(
                     num_tasks)
 
-                pending_tasks.extend(
-                    backend.grab_ready_tasks(
+                grabbed_tasks = backend.grab_ready_tasks(
                         task_type_name,
                         num_tasks=num_tasks,
                         num_tasks_priority=num_tasks_priority,
-                        cursor=cursor))
+                        cursor=cursor)
+                if grabbed_tasks:
+                    pending_tasks.extend(grabbed_tasks)
+                    logger.info('Grabbed %s tasks %s',
+                                len(grabbed_tasks), task_type_name)
 
         if not pending_tasks:
             return all_backend_tasks
@@ -83,7 +87,6 @@
             celery_result = app.send_task(
                 backend_name, args=args, kwargs=kwargs,
             )
-
             data = {
                 'task': task['id'],
                 'backend_id': celery_result.id,
@@ -91,15 +94,15 @@
             }
 
             backend_tasks.append(data)
+        logger.debug('Sent %s celery tasks', len(backend_tasks))
 
         backend.mass_schedule_task_runs(backend_tasks, cursor=cursor)
-
         backend.commit()
-
         all_backend_tasks.extend(backend_tasks)
 
 
 def main():
+    from .config import app as main_app
     for module in main_app.conf.CELERY_IMPORTS:
         __import__(module)
 
diff --git a/swh/scheduler/cli.py b/swh/scheduler/cli.py
--- a/swh/scheduler/cli.py
+++ b/swh/scheduler/cli.py
@@ -498,9 +498,11 @@
     logger.debug('Scheduler %s' % scheduler)
     try:
         while True:
-            logger.info('Run ready tasks')
+            logger.debug('Run ready tasks')
             try:
-                run_ready_tasks(scheduler, app)
+                ntasks = len(run_ready_tasks(scheduler, app))
+                if ntasks:
+                    logger.info('Scheduled %s tasks', ntasks)
             except Exception:
                 scheduler.rollback()
                 logger.exception('Unexpected error in run_ready_tasks()')