diff --git a/src/idtr.cpp b/src/idtr.cpp
index 11869ea..f0da0d7 100644
--- a/src/idtr.cpp
+++ b/src/idtr.cpp
@@ -735,18 +735,28 @@ template <typename T> class WaitPermute {
               SHARPY::rank_type cRank, SHARPY::rank_type nRanks,
               std::vector<Parts> &&parts, std::vector<int64_t> &&axes,
               std::vector<int64_t> oGShape, ndarray<T> &&input,
-              ndarray<T> &&output, std::vector<T> &&receiveBuffer,
-              std::vector<int> &&receiveOffsets,
+              ndarray<T> &&output, std::vector<T> &&sendBuffer,
+              std::vector<int> &&sendOffsets, std::vector<int> &&sendSizes,
+              std::vector<T> &&receiveBuffer, std::vector<int> &&receiveOffsets,
               std::vector<int> &&receiveSizes)
       : tc(tc), hdl(hdl), cRank(cRank), nRanks(nRanks), parts(std::move(parts)),
         axes(std::move(axes)), oGShape(std::move(oGShape)),
         input(std::move(input)), output(std::move(output)),
+        sendBuffer(std::move(sendBuffer)), sendOffsets(std::move(sendOffsets)),
+        sendSizes(std::move(sendSizes)),
         receiveBuffer(std::move(receiveBuffer)),
         receiveOffsets(std::move(receiveOffsets)),
         receiveSizes(std::move(receiveSizes)) {}
 
+  // Only allow move
+  WaitPermute(const WaitPermute &) = delete;
+  WaitPermute &operator=(const WaitPermute &) = delete;
+  WaitPermute(WaitPermute &&) = default;
+  WaitPermute &operator=(WaitPermute &&) = default;
+
   void operator()() {
     tc->wait(hdl);
+
     std::vector<std::vector<T>> receiveRankBuffer(nRanks);
     for (size_t rank = 0; rank < nRanks; ++rank) {
       auto &rankBuffer = receiveRankBuffer[rank];
@@ -755,6 +765,7 @@ template <typename T> class WaitPermute {
           receiveBuffer.begin() + receiveOffsets[rank] + receiveSizes[rank]);
     }
 
+    // FIXME: very low efficiency, need to improve
     std::vector<size_t> receiveRankBufferCount(nRanks, 0);
     input.globalIndices([&](const id &inputIndex) {
       id outputIndex = inputIndex.permute(axes);
@@ -777,6 +788,9 @@ template <typename T> class WaitPermute {
   std::vector<int64_t> oGShape;
   ndarray<T> input;
   ndarray<T> output;
+  std::vector<T> sendBuffer;
+  std::vector<int> sendOffsets;
+  std::vector<int> sendSizes;
   std::vector<T> receiveBuffer;
   std::vector<int> receiveOffsets;
   std::vector<int> receiveSizes;
@@ -870,6 +884,7 @@ WaitHandleBase *_idtr_copy_permute(SHARPY::DTypeId sharpytype,
   for (auto i = 0ul; i < nRanks; ++i) {
     dspl[i] = 4 * i;
   }
+
   tc->gather(parts.data(), counts.data(), dspl.data(), SHARPY::INT64,
              SHARPY::REPLICATED);
 
@@ -919,10 +934,12 @@ WaitHandleBase *_idtr_copy_permute(SHARPY::DTypeId sharpytype,
                           sendOffsets.data(), sharpytype, receiveBuffer.data(),
                           receiveSizes.data(), receiveOffsets.data());
 
-  auto wait = WaitPermute(tc, hdl, cRank, nRanks, std::move(parts),
-                          std::move(axes), std::move(oGShape), std::move(input),
-                          std::move(output), std::move(receiveBuffer),
-                          std::move(receiveOffsets), std::move(receiveSizes));
+  auto wait =
+      WaitPermute(tc, hdl, cRank, nRanks, std::move(parts), std::move(axes),
+                  std::move(oGShape), std::move(input), std::move(output),
+                  std::move(sendBuffer), std::move(sendOffsets),
+                  std::move(sendSizes), std::move(receiveBuffer),
+                  std::move(receiveOffsets), std::move(receiveSizes));
 
   assert(parts.empty() && axes.empty() && receiveBuffer.empty() &&
          receiveOffsets.empty() && receiveSizes.empty());