From 94d3e79a8617f88dc0219cfdeedfa3147833719d Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 24 Jun 2019 14:43:36 +0200
Subject: Initialize at openlb-1-3

---
 src/communication/blockLoadBalancer.hh | 105 +++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/communication/blockLoadBalancer.hh

(limited to 'src/communication/blockLoadBalancer.hh')

diff --git a/src/communication/blockLoadBalancer.hh b/src/communication/blockLoadBalancer.hh
new file mode 100644
index 0000000..0c61af1
--- /dev/null
+++ b/src/communication/blockLoadBalancer.hh
@@ -0,0 +1,105 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2007 Mathias Krause
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this program; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+#ifndef BLOCK_LOAD_BALANCER_HH
+#define BLOCK_LOAD_BALANCER_HH
+
+#include <vector>
+#include <map>
+#include "communication/mpiManager.h"
+#include "communication/blockLoadBalancer.h"
+#include "geometry/cuboidGeometry2D.h"
+#include "geometry/cuboidGeometry3D.h"
+#include "core/olbDebug.h"
+
+namespace olb {
+
+template<typename T>
+BlockLoadBalancer<T>::BlockLoadBalancer(int rank, int size, int globChunkSize, int offset)
+{
+  init_chunkD(rank, size, globChunkSize, offset);
+}
+
+template<typename T>
+BlockLoadBalancer<T>::BlockLoadBalancer(CuboidGeometry3D<T>& cGeometry)
+{
+  init_chunkD(singleton::mpi().getRank(), singleton::mpi().getSize(), cGeometry.getNc(), 0);
+}
+
+template<typename T>
+BlockLoadBalancer<T>::BlockLoadBalancer(CuboidGeometry2D<T>& cGeometry)
+{
+  init_chunkD(singleton::mpi().getRank(), singleton::mpi().getSize(), cGeometry.getNc(), 0);
+}
+
+template<typename T>
+void BlockLoadBalancer<T>::init_chunkD(int rank, int size, int globChunkSize, int offset)
+{
+
+  OLB_PRECONDITION(rank>=0 && size>=1 && offset>=0)
+  OLB_PRECONDITION(size<=globChunkSize &&  rank<size);
+
+  // nice way to calculate # of chunks per processor
+  this->_locChunkSize = (globChunkSize+size-rank-1)/size;
+  this->_size = _locChunkSize;
+  if (rank+1 <= globChunkSize-(globChunkSize/size)*size) {
+    this->_firstGlobNum = globChunkSize/size * rank + rank + offset;
+    this->_lastGlobNum  = this->_firstGlobNum + this->_locChunkSize - 1;
+  } else {
+    this->_firstGlobNum = globChunkSize/size * rank + globChunkSize - (globChunkSize/size)*size + offset;
+    this->_lastGlobNum  = this->_firstGlobNum + this->_locChunkSize - 1;
+  }
+  for (int i=0; i<this->_locChunkSize; i++) {
+    this->_loc[this->_firstGlobNum + i] = i;
+    this->_glob.push_back(this->_firstGlobNum + i);
+  }
+  int temp = offset;
+  for (int iRank=0; iRank<size; iRank++) {
+    int iLocChunkSize = (globChunkSize+size-iRank-1)/size;
+    for (int i=0; i<iLocChunkSize; i++) {
+      this->_rank[temp] = iRank;
+      temp++;
+    }
+  }
+}
+
+template<typename T>
+int BlockLoadBalancer<T>::locChunkSize() const
+{
+  return _locChunkSize;
+}
+
+template<typename T>
+int BlockLoadBalancer<T>::firstGlobNum() const
+{
+  return _firstGlobNum;
+}
+
+template<typename T>
+int BlockLoadBalancer<T>::lastGlobNum() const
+{
+  return _lastGlobNum;
+}
+
+}  // namespace olb
+#endif
-- 
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