diff --git a/bmtk/simulator/filternet/modules/record_rates.py b/bmtk/simulator/filternet/modules/record_rates.py
index 39da776e..1c9cd485 100644
--- a/bmtk/simulator/filternet/modules/record_rates.py
+++ b/bmtk/simulator/filternet/modules/record_rates.py
@@ -4,22 +4,18 @@
 import h5py
 import numpy as np
 import glob
-import uuid
-from pathlib import Path
 
 from .base import SimModule
 from bmtk.utils.io.ioutils import bmtk_world_comm
-from bmtk.simulator.filternet.io_tools import io
-
+import tempfile
 
 class RecordRates(SimModule):
     def __init__(self, csv_file=None, h5_file=None, tmp_dir='output', sort_order='node_id',
-                 compression='gzip', clean_temp_files=True):
+                 compression='gzip'):
         self._tmp_dir = tmp_dir
         self._csv_file = csv_file if csv_file is None or os.path.isabs(csv_file) else os.path.join(tmp_dir, csv_file)
         self._save_to_csv = csv_file is not None
         self._tmp_rates_path = None
-        self._clean_tmp_files = clean_temp_files
 
         h5_file = h5_file if h5_file is None or os.path.isabs(h5_file) else os.path.join(tmp_dir, h5_file)
         self._save_to_h5 = h5_file is not None
@@ -38,24 +34,6 @@ def __init__(self, csv_file=None, h5_file=None, tmp_dir='output', sort_order='no
         self._node_ids = {}
         self._firing_rates = {}
         self._node_counter = 0
-        self._runtime_gid = bmtk_world_comm.global_uuid(default='filternet') # self.get_global_uuid()
-
-    def get_global_uuid(self):
-        try:
-            if bmtk_world_comm.MPI_size == 1:
-                return str(uuid.uuid4().hex)
-            
-            if bmtk_world_comm.MPI_rank == 0:
-                bcast_data = str(uuid.uuid4().hex)
-            else:
-                bcast_data = None    
-
-            bcast_data = bmtk_world_comm.comm.bcast(bcast_data, root=0)
-            return bcast_data
-
-        except Exception as e:
-            return 'filternet'
-
 
     def initialize(self, sim):
         self._node_counter = 0
@@ -75,12 +53,15 @@ def save(self, sim, cell, times, rates):
         self._node_ids[cell.population][self._node_counter] = cell.node_id
         self._node_counter += 1
 
-
     def finalize(self, sim):
-        io.log_debug('Writing rates to file(s)...')
         if bmtk_world_comm.MPI_size > 1:
-            self._tmp_rates_path = os.path.join(self._tmp_dir, f'.rates.{self._runtime_gid}.{bmtk_world_comm.MPI_rank}.h5')
-            
+            fd, path = tempfile.mkstemp(
+            prefix='.rates.rank_{}.'.format(bmtk_world_comm.MPI_rank),
+            suffix='.h5',
+            dir=self._tmp_dir
+            )
+            self._tmp_rates_path = path
+            os.close(fd)
             self._write_rates_on_rank()
             bmtk_world_comm.barrier()
 
@@ -119,9 +100,7 @@ def finalize(self, sim):
                             csv_writer.writerow([node_id, pop, ts, fr])
 
         bmtk_world_comm.barrier()
-        if self._clean_tmp_files:
-            self._clean()
-        io.log_debug('Writing rates to file(s)... done.')
+        self._clean()
 
     def _write_rates_on_rank(self):
         with h5py.File(self._tmp_rates_path, 'w') as h5:
@@ -133,13 +112,12 @@ def _write_rates_on_rank(self):
 
     def _combine_rates(self):
         n_cells = {}
+        rates_paths = bmtk_world_comm.gather(self._tmp_rates_path, root=0)
         if bmtk_world_comm.MPI_rank == 0:
-            rates_paths = glob.glob(os.path.join(self._tmp_dir, f'.rates.{self._runtime_gid}.*.h5'))
             h5_handles = []
             timestamps = None
 
             for rp in rates_paths:
-                assert(Path(rp).exists())
                 rates_h5 = h5py.File(rp, 'r')
                 h5_handles.append(rates_h5)
                 for pop, pop_grp in rates_h5.items():
diff --git a/bmtk/utils/io/ioutils.py b/bmtk/utils/io/ioutils.py
index 1d3f2c06..8d6bfe3c 100644
--- a/bmtk/utils/io/ioutils.py
+++ b/bmtk/utils/io/ioutils.py
@@ -1,9 +1,6 @@
-import uuid
-
 class BMTKWorldComm(object):
     def __init__(self):
         self._comm = None
-        self._global_uuid = None
 
     @property
     def comm(self):
@@ -35,30 +32,15 @@ def MPI_size(self):
         else:
             return self.comm.Get_size()
 
-    def global_uuid(self, default='NA'):
-        if self._global_uuid is None:
-            try:
-                if bmtk_world_comm.MPI_size == 1:
-                    self._global_uuid = str(uuid.uuid4().hex)
-                else:
-                    if bmtk_world_comm.MPI_rank == 0:
-                        bcast_data = str(uuid.uuid4().hex)
-                    else:
-                        bcast_data = None    
-
-                    bcast_data = bmtk_world_comm.comm.bcast(bcast_data, root=0)
-                    self._global_uuid = bcast_data
-
-            except Exception as e:
-                self._global_uuid = default
-
-        return self._global_uuid
-
-
     def barrier(self):
         if self.comm is not None:
             self.comm.Barrier()
 
+    def gather(self, data, root=0):
+        if self.comm is not None:
+            return self.comm.gather(data, root=root)
+        
+
 
 bmtk_world_comm = BMTKWorldComm()