Improving SpMV benchmark with benchmark results.

src/Benchmarks/SpMV/SpmvBenchmarkResult.h

+/***************************************************************************
+                          SpmvBenchmarkResult.h  -  description
+                             -------------------
+    begin                : Mar 5, 2020
+    copyright            : (C) 2020 by Tomas Oberhuber
+    email                : tomas.oberhuber@fjfi.cvut.cz
+ ***************************************************************************/
+
+/* See Copyright Notice in tnl/Copyright */
+
+#pragma once
+
+#include "../Benchmarks.h"
+
+namespace TNL {
+namespace Benchmarks {
+
+template< typename Real = double,
+          typename Index = int >
+struct SpmvBenchmarkResult
+: public BenchmarkResult
+{
+   using RealType = Real;
+   using IndexType = Index;
+   using HostVector = Containers::Vector< Real, Devices::Host, Index >;
+   using CudaVector = Containers::Vector< Real, Devices::Cuda, Index >;
+
+   SpmvBenchmarkResult( CudaVector& cudaResult, HostVector& hostResult, CudaVector& cusparseResult )
+   : hostResult( hostResult ), cudaResult( cudaResult), cusparseResult( cusparseResult ){};
+
+   virtual HeaderElements getTableHeader() const override
+   {
+      return HeaderElements({"time", "stddev", "stddev/time", "speedup", "Host.Diff.Max", "Host.Diff.L2", "Cusparse.Diff.Max", "Cusparse.Diff.L2"});
+   }
+
+   virtual RowElements getRowElements() const override
+   {
+      HostVector cudaCopy, cusparseCopy, a, b;
+      cudaCopy = cudaResult;
+      cusparseCopy = cusparseResult;
+      a = cudaCopy - hostResult;
+      b = cudaCopy - cusparseCopy;
+      return RowElements({ time, stddev, stddev/time, speedup, max( abs( a ) ), lpNorm( a, 2.0 ), max( abs( b ) ), lpNorm( b, 2.0 ) });
+   }
+
+   HostVector &hostResult;
+
+   CudaVector &cudaResult, &cusparseResult;
+};
+   
+} //namespace Benchmarks
+} //namespace TNL