From 31c3c353a3b069df7b710f52595d1b8310e615df Mon Sep 17 00:00:00 2001
From: aber-sandag <aber@sandag.org>
Date: Wed, 10 Apr 2024 10:24:36 -0700
Subject: [PATCH] Don't use shared memory when running singleprocessed (temp
 fix)

---
 activitysim/core/skim_dict_factory.py | 37 +++++++++++++++------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/activitysim/core/skim_dict_factory.py b/activitysim/core/skim_dict_factory.py
index 5755964d5..a3b37aea2 100644
--- a/activitysim/core/skim_dict_factory.py
+++ b/activitysim/core/skim_dict_factory.py
@@ -409,7 +409,7 @@ def allocate_skim_buffer(self, skim_info, shared=False):
             f"total size: {util.INT(csz)} ({util.GB(csz)})"
         )
 
-        # if shared:
+        if shared:
             # if dtype_name == "float64":
             #     typecode = "d"
             # elif dtype_name == "float32":
@@ -420,15 +420,15 @@ def allocate_skim_buffer(self, skim_info, shared=False):
             #     )
 
             # buffer = multiprocessing.RawArray(typecode, buffer_size)
-        shared_mem_name = f"skim_shared_memory__{skim_info.skim_tag}"
-        try:
-            buffer = multiprocessing.shared_memory.SharedMemory(name=shared_mem_name)
-            logger.info(f"skim buffer already allocated in shared memory: {shared_mem_name}, size: {buffer.size}")
-        except FileNotFoundError:
-            buffer = multiprocessing.shared_memory.SharedMemory(create=True, size=csz, name=shared_mem_name)
-            logger.info(f"allocating skim buffer in shared memory: {shared_mem_name}, size: {buffer.size}")
-        # else:
-        #     buffer = np.zeros(buffer_size, dtype=dtype)
+            shared_mem_name = f"skim_shared_memory__{skim_info.skim_tag}"
+            try:
+                buffer = multiprocessing.shared_memory.SharedMemory(name=shared_mem_name)
+                logger.info(f"skim buffer already allocated in shared memory: {shared_mem_name}, size: {buffer.size}")
+            except FileNotFoundError:
+                buffer = multiprocessing.shared_memory.SharedMemory(create=True, size=csz, name=shared_mem_name)
+                logger.info(f"allocating skim buffer in shared memory: {shared_mem_name}, size: {buffer.size}")
+        else:
+            buffer = np.zeros(buffer_size, dtype=dtype)
 
         return buffer
 
@@ -447,11 +447,16 @@ def _skim_data_from_buffer(self, skim_info, skim_buffer):
         """
 
         dtype = np.dtype(skim_info.dtype_name)
-        # assert len(skim_buffer) == util.iprod(skim_info.skim_data_shape)
-        assert skim_buffer.size >= util.iprod(skim_info.skim_data_shape) * dtype.itemsize
-        skim_data = np.frombuffer(skim_buffer.buf, dtype=dtype, count=util.iprod(skim_info.skim_data_shape)).reshape(
-            skim_info.skim_data_shape
-        )
+        if isinstance(skim_buffer, multiprocessing.shared_memory.SharedMemory):
+            assert skim_buffer.size >= util.iprod(skim_info.skim_data_shape) * dtype.itemsize
+            skim_data = np.frombuffer(skim_buffer.buf, dtype=dtype, count=util.iprod(skim_info.skim_data_shape)).reshape(
+                skim_info.skim_data_shape
+            )
+        else:
+            assert len(skim_buffer) == util.iprod(skim_info.skim_data_shape)
+            skim_data = np.frombuffer(skim_buffer, dtype=dtype).reshape(
+                skim_info.skim_data_shape
+            )
         return skim_data
 
     def load_skims_to_buffer(self, skim_info, skim_buffer):
@@ -470,7 +475,7 @@ def load_skims_to_buffer(self, skim_info, skim_buffer):
         skim_data = self._skim_data_from_buffer(skim_info, skim_buffer)
         assert skim_data.shape == skim_info.skim_data_shape
 
-        if skim_data.any():
+        if isinstance(skim_buffer, multiprocessing.shared_memory.SharedMemory) and skim_data.any():
             return
 
         if read_cache: