dash::copy: Pass local_chunks by the caller

This way one can call copy_impl multiple times, before triggering local
copies.

Author: bertwesarg

dash/include/dash/algorithm/Copy.h

@@ -141,10 +141,13 @@ template <
   typename ValueType,
   typename GlobInputIt >
 ValueType * copy_impl(
-  GlobInputIt                  begin,
-  GlobInputIt                  end,
-  ValueType                  * out_first,
-  std::vector<dart_handle_t> * handles)
+  GlobInputIt                           begin,
+  GlobInputIt                           end,
+  ValueType                           * out_first,
+  std::vector<dart_handle_t>          * handles,
+  local_copy_chunks<
+    typename GlobInputIt::value_type,
+    ValueType>                        & local_chunks)
 {
   DASH_LOG_TRACE("dash::internal::copy_impl() global -> local",
                  "in_first:",  begin.pos(),
@@ -171,8 +174,6 @@ ValueType * copy_impl(
 
   ContiguousRangeSet<GlobInputIt> range_set{begin, end};
 
-  local_copy_chunks<input_value_type, output_value_type> local_chunks;
-
   //
   // Copy elements from every unit:
   //
@@ -216,8 +217,6 @@ ValueType * copy_impl(
     num_elem_copied += num_copy_elem;
   }
 
-  do_local_copies(local_chunks);
-
   DASH_ASSERT_EQ(num_elem_copied, num_elem_total,
                  "Failed to find all contiguous subranges in range");
 
@@ -238,10 +237,13 @@ template <
   typename ValueType,
   typename GlobOutputIt >
 GlobOutputIt copy_impl(
-  ValueType                  * begin,
-  ValueType                  * end,
-  GlobOutputIt                 out_first,
-  std::vector<dart_handle_t> * handles)
+  ValueType                           * begin,
+  ValueType                           * end,
+  GlobOutputIt                          out_first,
+  std::vector<dart_handle_t>          * handles,
+  local_copy_chunks<
+    ValueType,
+    typename GlobOutputIt::value_type> & local_chunks)
 {
   DASH_LOG_TRACE("dash::copy_impl() local -> global",
                  "in_first:",  begin,
@@ -271,8 +273,6 @@ GlobOutputIt copy_impl(
 
   ContiguousRangeSet<GlobOutputIt> range_set{out_first, out_last};
 
-  local_copy_chunks<input_value_type, output_value_type> local_chunks;
-
   auto in_first = begin;
 
   //
@@ -317,8 +317,6 @@ GlobOutputIt copy_impl(
     num_elem_copied += num_copy_elem;
   }
 
-  do_local_copies(local_chunks);
-
   DASH_ASSERT_EQ(num_elem_copied, num_elem_total,
                  "Failed to find all contiguous subranges in range");
 
@@ -355,9 +353,10 @@ dash::Future<ValueType *> copy_async(
   }
 
   auto handles = std::make_shared<std::vector<dart_handle_t>>();
-
-  auto out_last = dash::internal::copy_impl(in_first, in_last,
-                                            out_first, handles.get());
+  dash::internal::local_copy_chunks<typename GlobInputIt::value_type, ValueType> local_chunks;
+  auto out_last = dash::internal::copy_impl(in_first, in_last, out_first,
+                                            handles.get(), local_chunks);
+  dash::internal::do_local_copies(local_chunks);
 
   if (handles->empty()) {
     DASH_LOG_TRACE("dash::copy_async", "all transfers completed");
@@ -441,24 +440,29 @@ ValueType * copy(
   }
 
   ValueType *out_last;
+  dash::internal::local_copy_chunks<typename GlobInputIt::value_type, ValueType> local_chunks;
   if (UseHandles) {
     std::vector<dart_handle_t> handles;
     out_last = dash::internal::copy_impl(in_first,
                                          in_last,
                                          out_first,
-                                         &handles);
+                                         &handles,
+                                         local_chunks);
     if (!handles.empty()) {
       DASH_LOG_TRACE("dash::copy", "Waiting for remote transfers to complete,",
                     "num_handles: ", handles.size());
       dart_waitall_local(handles.data(), handles.size());
     }
+    dash::internal::do_local_copies(local_chunks);
 
   } else {
     out_last = dash::internal::copy_impl(in_first,
                                          in_last,
                                          out_first,
-                                         nullptr);
+                                         nullptr,
+                                            local_chunks);
     DASH_LOG_TRACE("dash::copy", "Waiting for remote transfers to complete");
+    dash::internal::do_local_copies(local_chunks);
     dart_flush_local_all(in_first.dart_gptr());
   }
 
@@ -491,10 +495,13 @@ dash::Future<GlobOutputIt> copy_async(
   }
 
   auto handles  = std::make_shared<std::vector<dart_handle_t>>();
+  dash::internal::local_copy_chunks<ValueType, typename GlobOutputIt::value_type> local_chunks;
   auto out_last = dash::internal::copy_impl(in_first,
                                             in_last,
                                             out_first,
-                                            handles.get());
+                                            handles.get(),
+                                            local_chunks);
+  dash::internal::do_local_copies(local_chunks);
 
   if (handles->empty()) {
     return dash::Future<GlobOutputIt>(out_last);
@@ -565,12 +572,15 @@ GlobOutputIt copy(
   DASH_LOG_TRACE("dash::copy()", "blocking, local to global");
   // handles to wait on at the end
   GlobOutputIt out_last;
+  dash::internal::local_copy_chunks<ValueType, typename GlobOutputIt::value_type> local_chunks;
   if (UseHandles) {
     std::vector<dart_handle_t> handles;
     out_last = dash::internal::copy_impl(in_first,
                                          in_last,
                                          out_first,
-                                         &handles);
+                                         &handles,
+                                         local_chunks);
+    dash::internal::do_local_copies(local_chunks);
 
     if (!handles.empty()) {
       DASH_LOG_TRACE("dash::copy", "Waiting for remote transfers to complete,",
@@ -581,8 +591,10 @@ GlobOutputIt copy(
     out_last = dash::internal::copy_impl(in_first,
                                          in_last,
                                          out_first,
-                                         nullptr);
+                                         nullptr,
+                                         local_chunks);
     DASH_LOG_TRACE("dash::copy", "Waiting for remote transfers to complete");
+    dash::internal::do_local_copies(local_chunks);
     dart_flush_all(out_first.dart_gptr());
   }
   return out_last;