diff --git a/test/test_cpp_temporal_reduction_io.cpp b/test/test_cpp_temporal_reduction_io.cpp
index 9479241df..9334c21d7 100644
--- a/test/test_cpp_temporal_reduction_io.cpp
+++ b/test/test_cpp_temporal_reduction_io.cpp
@@ -26,16 +26,18 @@ int main(int argc, char **argv)
     teca_system_interface::set_stack_trace_on_error();
     teca_system_interface::set_stack_trace_on_mpi_error();
 
-    if (argc != 22)
+    if (argc != 25)
     {
         if (rank == 0)
         {
             std::cerr << "test_temporal_reduction [files regex]"
                 " [x axis var] [y axis var] [z axis var] [t axis var]"
                 " [red var] [first step] [last step]"
-                " [red threads] [red threads per dev] [red ranks per dev] [red bind threads] [red prop dev]"
+                " [red threads] [red threads per dev] [red ranks per dev] [red stream size] [red bind threads] [red prop dev]"
                 " [reduction interval] [reduction operator] [steps per request]"
-                " [out file] [file layout] [wri threads] [wri threads per dev] [wri ranks per dev]" << std::endl;
+                " [out file] [file layout]"
+                " [wri threads] [wri threads per dev] [wri ranks per dev] [wri stream size] [wri bind threads]"
+                << std::endl;
         }
         return -1;
     }
@@ -52,30 +54,34 @@ int main(int argc, char **argv)
     int n_red_threads = atoi(argv[9]);
     int red_threads_per_dev = atoi(argv[10]);
     int red_ranks_per_dev = atoi(argv[11]);
-    int red_bind_threads = atoi(argv[12]);
-    int red_prop_dev_id = atoi(argv[13]);
+    int red_stream_size = atoi(argv[12]);
+    int red_bind_threads = atoi(argv[13]);
+    int red_prop_dev_id = atoi(argv[14]);
 
-    std::string red_int = argv[14];
-    std::string red_op = argv[15];
-    int steps_per_req = atoi(argv[16]);
+    std::string red_int = argv[15];
+    std::string red_op = argv[16];
+    int steps_per_req = atoi(argv[17]);
 
-    std::string ofile_name = argv[17];
-    std::string layout = argv[18];
-    int n_wri_threads = atoi(argv[19]);
-    int wri_threads_per_dev = atoi(argv[20]);
-    int wri_ranks_per_dev = atoi(argv[21]);
+    std::string ofile_name = argv[18];
+    std::string layout = argv[19];
+    int n_wri_threads = atoi(argv[20]);
+    int wri_threads_per_dev = atoi(argv[21]);
+    int wri_ranks_per_dev = atoi(argv[22]);
+    int wri_stream_size = atoi(argv[23]);
+    int wri_bind_threads = atoi(argv[24]);
 
 
     if (rank == 0)
     {
         std::cerr << "n_ranks=" << n_ranks
             << "  n_red_threads=" << n_red_threads << "  red_threads_per_dev=" << red_threads_per_dev
-            << "  red_ranks_per_dev=" << red_ranks_per_dev << "  red_bind_threads=" << red_bind_threads
-            << "  red_pro_dev_id=" << red_prop_dev_id << "  red_int=" << red_int << "  red_op=" << red_op
-            << "  steps_per_req=" << steps_per_req
+            << "  red_ranks_per_dev=" << red_ranks_per_dev << "red_stream_size=" << red_stream_size
+            << "  red_bind_threads=" << red_bind_threads << "  red_pro_dev_id=" << red_prop_dev_id
+            << "  red_int=" << red_int << "  red_op=" << red_op << "  steps_per_req=" << steps_per_req
             << "  layout=" << layout << "  n_wri_threads=" << n_wri_threads
             << "  wri_threads_per_dev=" << wri_threads_per_dev
-            << "  wri_ranks_per_dev=" << wri_ranks_per_dev
+            << "  wri_ranks_per_dev=" << wri_ranks_per_dev << "  wri_stream_size=" << wri_stream_size
+            << "  wri_bind_threads=" << wri_bind_threads
             << std::endl;
     }
 
@@ -94,6 +100,7 @@ int main(int argc, char **argv)
     reduc->set_threads_per_device(red_threads_per_dev);
     reduc->set_ranks_per_device(red_ranks_per_dev);
     reduc->set_bind_threads(red_bind_threads);
+    reduc->set_stream_size(red_stream_size);
     reduc->set_propagate_device_assignment(red_prop_dev_id);
     reduc->set_thread_pool_size(n_red_threads);
     reduc->set_interval(red_int);
@@ -107,6 +114,8 @@ int main(int argc, char **argv)
     cfw->set_verbose(1);
     cfw->set_threads_per_device(wri_threads_per_dev);
     cfw->set_ranks_per_device(wri_ranks_per_dev);
+    cfw->set_stream_size(wri_stream_size);
+    cfw->set_bind_threads(wri_bind_threads);
     cfw->set_thread_pool_size(n_wri_threads);
     cfw->set_file_name(ofile_name);
     cfw->set_layout(layout);