diff --git a/api/onnx_web/params.py b/api/onnx_web/params.py
index 07cf082a..9bd5e819 100644
--- a/api/onnx_web/params.py
+++ b/api/onnx_web/params.py
@@ -2,6 +2,7 @@ from enum import IntEnum
 from logging import getLogger
 from typing import Any, Dict, List, Literal, Optional, Tuple, Union
 
+import torch
 from onnxruntime import GraphOptimizationLevel, SessionOptions
 
 logger = getLogger(__name__)
diff --git a/api/onnx_web/worker/pool.py b/api/onnx_web/worker/pool.py
index fa2e5f57..8f6a6d13 100644
--- a/api/onnx_web/worker/pool.py
+++ b/api/onnx_web/worker/pool.py
@@ -26,7 +26,8 @@ class DevicePoolExecutor:
         self.devices = devices
         self.finished = []
         self.finished_limit = finished_limit
-        self.lock = Lock()
+        self.context = {}
+        self.locks = {}
         self.pending = {}
         self.progress = {}
         self.workers = {}
@@ -42,15 +43,18 @@ class DevicePoolExecutor:
         # create a pending queue and progress value for each device
         for device in devices:
             name = device.device
-            cancel = Value("B", False, lock=self.lock)
-            progress = Value("I", 0, lock=self.lock)
+            lock = Lock()
+            self.locks[name] = lock
+            cancel = Value("B", False, lock=lock)
+            progress = Value("I", 0, lock=lock)
+            self.progress[name] = progress
             pending = Queue()
-            context = WorkerContext(name, cancel, device, pending, progress)
             self.pending[name] = pending
-            self.progress[name] = pending
+            context = WorkerContext(name, cancel, device, pending, progress)
+            self.context[name] = context
 
             logger.debug("starting worker for device %s", device)
-            self.workers[name] = Process(target=worker_init, args=(self.lock, context))
+            self.workers[name] = Process(target=worker_init, args=(lock, context))
             self.workers[name].start()
 
     def cancel(self, key: str) -> bool:
@@ -135,6 +139,7 @@ class DevicePoolExecutor:
             (
                 device.device,
                 self.pending[device.device].qsize(),
+                self.progress[device.device].value,
                 self.workers[device.device].is_alive(),
             )
             for device in self.devices
diff --git a/api/onnx_web/worker/worker.py b/api/onnx_web/worker/worker.py
index e5d46306..f5d3689c 100644
--- a/api/onnx_web/worker/worker.py
+++ b/api/onnx_web/worker/worker.py
@@ -1,7 +1,8 @@
 from logging import getLogger
+import torch # has to come before ORT
 from onnxruntime import get_available_providers
 from torch.multiprocessing import Lock, Queue
-from traceback import print_exception
+from traceback import format_exception
 
 from .context import WorkerContext
 
@@ -30,5 +31,5 @@ def worker_init(lock: Lock, context: WorkerContext):
             fn(context, *args, **kwargs)
             logger.info("finished job")
         except Exception as e:
-            print_exception(type(e), e, e.__traceback__)
+            logger.error(format_exception(type(e), e, e.__traceback__))