Fix 32-bit gcc compile warnings.

Change-Id: Ibc39ca1d1a27d0d28569e29f41a5647659f8c764

paddle/pserver/ParameterClient2.cpp

@@ -278,7 +278,7 @@ void ParameterClient2::prepareSendData(
 
           if (sendingPara) {
             sendJob->parallelInputIovs[serverId].push_back(
-                {sendMat->getLocalRow(row), sizeof(real) * blockSize});
+                {sendMat->getLocalRow(row), sizeof(real) * (size_t) blockSize});
             /// detect sparse parameter distribution
             sparseDistribution_->probeDistribution(serverId,
                     sizeof(real) * blockSize);
@@ -302,8 +302,8 @@ void ParameterClient2::prepareSendData(
         block->set_begin_pos(beginDim);
         block->set_block_size(endDim - beginDim);
         if (buf) {
-            sendJob->parallelInputIovs[serverId].push_back(
-                    {buf + beginDim, sizeof(real) * (endDim - beginDim)});
+            sendJob->parallelInputIovs[serverId].push_back({buf + beginDim,
+                     sizeof(real) * ((size_t) (endDim - beginDim))});
         }
       }
     }

paddle/pserver/ParameterServer2.cpp

@@ -724,7 +724,7 @@ void ParameterServer2::sendBackParameter(const ParameterBlock& block,
       << " id=" << block.para_id() << " block id=" << block.block_id();
 
   real* valueBuffer = vectors_[parameterType]->getPoint(offset);
-  outputBuffers->push_back({valueBuffer, block.block_size()});
+  outputBuffers->push_back({valueBuffer, (size_t) block.block_size()});
 }
 
 void ParameterServer2::sendBackParameter(const ParameterBlock& block,

paddle/pserver/SocketChannel.cpp

@@ -148,7 +148,8 @@ void SocketChannel::writeMessage(const std::vector<struct iovec>& userIovs) {
   std::vector<iovec> iovs;
   iovs.reserve(userIovs.size() + 2);
   iovs.push_back({&header, sizeof(header)});
-  iovs.push_back({&iovLengths[0], sizeof(iovLengths[0]) * header.numIovs});
+  iovs.push_back({&iovLengths[0],
+       sizeof(iovLengths[0]) * (size_t) header.numIovs});
   iovs.insert(iovs.end(), userIovs.begin(), userIovs.end());
 
   header.totalLength = 0;