using numpy to alter values of service buffer

environment.yml

@@ -16,6 +16,7 @@ dependencies:
   - cython
   - psutil
   - pytest
+  - numpy
   # for downloading packages from PyPI
   - pip
   - pip:

requirements.txt

@@ -5,6 +5,7 @@ dask[complete]>=2.22.0
 distributed>=2.22.0
 mpi4py>=3.0.3
 msgpack>=1.0.0
+numpy
 # https://github.com/modin-project/unidist/issues/324
 pydantic<2
 ray[default]>=1.13.0

unidist/core/backends/mpi/core/shared_object_store.py

@@ -10,6 +10,7 @@
 import psutil
 import weakref
 from array import array
+import numpy as np
 
 from unidist.core.backends.mpi.core._memory import parallel_memcopy
 from unidist.core.backends.mpi.utils import ImmutableDict
@@ -190,9 +191,8 @@ def _allocate_shared_memory(self):
         self.service_shared_buffer = memoryview(service_buffer).cast("l")
         # Set -1 to the service buffer because 0 is a valid value and may be recognized by mistake.
         if mpi_state.is_monitor_process():
-            self.service_shared_buffer[:] = array(
-                "l", [-1] * len(self.service_shared_buffer)
-            )
+            memoryview_array = np.frombuffer(self.service_shared_buffer,dtype=np.int64)
+            memoryview_array[:] = -1
 
     def _parse_data_id(self, data_id):
         """