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       1                 :            : // *****************************************************************************
       2                 :            : /*!
       3                 :            :   \file      src/Inciter/DiagReducer.cpp
       4                 :            :   \copyright 2012-2015 J. Bakosi,
       5                 :            :              2016-2018 Los Alamos National Security, LLC.,
       6                 :            :              2019-2021 Triad National Security, LLC.
       7                 :            :              All rights reserved. See the LICENSE file for details.
       8                 :            :   \brief     Custom Charm++ reducer for merging std::vectors across PEs
       9                 :            :   \details   Custom Charm++ reducer for merging std::vectors across PEs.
      10                 :            : */
      11                 :            : // *****************************************************************************
      12                 :            : 
      13                 :            : #include <stddef.h>
      14                 :            : #include <type_traits>
      15                 :            : #include <memory>
      16                 :            : 
      17                 :            : #include "DiagReducer.hpp"
      18                 :            : #include "Diagnostics.hpp"
      19                 :            : #include "Exception.hpp"
      20                 :            : 
      21                 :            : namespace inciter {
      22                 :            : 
      23                 :            : std::pair< int, std::unique_ptr<char[]> >
      24                 :      34419 : serialize( std::size_t meshid,
      25                 :            :            std::size_t ncomp,
      26                 :            :            const std::vector< std::vector< tk::real > >& d )
      27                 :            : // *****************************************************************************
      28                 :            : // Serialize std::vectors to raw memory stream
      29                 :            : //! \param[in] meshid Mesh ID
      30                 :            : //! \param[in] ncomp Number of scalar components being solved
      31                 :            : //! \param[in] d Diagnostics vector of vectors (of eq components)
      32                 :            : //! \return Pair of the length and the raw stream containing the serialized
      33                 :            : //!   vectors
      34                 :            : // *****************************************************************************
      35                 :            : {
      36                 :            :   // Prepare for serializing diagnostics to a raw binary stream, compute size
      37                 :      34419 :   PUP::sizer sizer;
      38                 :            :   sizer | meshid;
      39                 :            :   sizer | ncomp;
      40                 :            :   sizer | const_cast< std::vector< std::vector< tk::real > >& >( d );
      41                 :            : 
      42                 :            :   // Create raw character stream to store the serialized vectors
      43                 :            :   std::unique_ptr<char[]> flatData = std::make_unique<char[]>( sizer.size() );
      44                 :            : 
      45                 :            :   // Serialize vector, each message will contain a vector
      46                 :            :   PUP::toMem packer( flatData.get() );
      47                 :            :   packer | meshid;
      48                 :            :   packer | ncomp;
      49                 :            :   packer | const_cast< std::vector< std::vector< tk::real > >& >( d );
      50                 :            : 
      51                 :            :   // Return size of and raw stream
      52                 :      34419 :   return { sizer.size(), std::move(flatData) };
      53                 :            : }
      54                 :            : 
      55                 :            : CkReductionMsg*
      56         [ +  - ]:       4961 : mergeDiag( int nmsg, CkReductionMsg **msgs )
      57                 :            : // *****************************************************************************
      58                 :            : // Charm++ custom reducer for merging diagnostics during reduction across PEs
      59                 :            : //! \param[in] nmsg Number of messages in msgs
      60                 :            : //! \param[in] msgs Charm++ reduction message containing the serialized
      61                 :            : //!   diagnostics
      62                 :            : //! \return Aggregated diagnostics built for further aggregation if needed
      63                 :            : // *****************************************************************************
      64                 :            : {
      65                 :            :   std::size_t meshid, ncomp;
      66                 :       4961 :   std::vector< std::vector< tk::real > > v;
      67                 :            : 
      68                 :            :   // Create PUP deserializer based on message passed in
      69         [ +  - ]:       4961 :   PUP::fromMem creator( msgs[0]->getData() );
      70                 :            : 
      71                 :            :   // Deserialize vector from raw stream
      72                 :            :   creator | meshid;
      73                 :            :   creator | ncomp;
      74                 :            :   creator | v;
      75                 :            : 
      76         [ +  + ]:      31233 :   for (int m=1; m<nmsg; ++m) {
      77                 :            :     // Unpack vector
      78                 :            :     std::size_t mid, nc;
      79                 :      26272 :     std::vector< std::vector< tk::real > > w;
      80         [ +  - ]:      26272 :     PUP::fromMem curCreator( msgs[m]->getData() );
      81                 :            :     curCreator | mid;
      82                 :            :     curCreator | nc;
      83                 :            :     curCreator | w;
      84                 :            :     // Aggregate diagnostics vector
      85                 :      26272 :     meshid = mid;
      86                 :      26272 :     ncomp = nc;
      87                 :            :     Assert( v.size() == w.size(),
      88                 :            :             "Size mismatch during diagnostics aggregation" );
      89                 :            :     Assert( v.size() == inciter::NUMDIAG,
      90                 :            :             "Size mismatch during diagnostics aggregation" );
      91         [ +  + ]:     236448 :     for (std::size_t i=0; i<v.size(); ++i)
      92                 :            :       Assert( v[i].size() == w[i].size(),
      93                 :            :               "Size mismatch during diagnostics aggregation" );
      94                 :            :     // Apply diagnostics aggregation policy
      95                 :            :     // Sum for L2 normal of the numerical solution for all scalar components
      96         [ +  + ]:     104334 :     for (std::size_t i=0; i<v[L2SOL].size(); ++i) v[L2SOL][i] += w[L2SOL][i];
      97                 :            :     // Sum for the L2 norm of the numerical - analytical solution for all comps
      98         [ +  + ]:     104334 :     for (std::size_t i=0; i<v[L2ERR].size(); ++i) v[L2ERR][i] += w[L2ERR][i];
      99                 :            :     // Sum for the L2 norm of the residual of all components
     100         [ +  + ]:     104334 :     for (std::size_t i=0; i<v[L2RES].size(); ++i) v[L2RES][i] += w[L2RES][i];
     101                 :            :     // Max for the Linf norm of the numerical - analytical solution for all comp
     102         [ +  + ]:     104334 :     for (std::size_t i=0; i<v[LINFERR].size(); ++i)
     103         [ +  + ]:      78062 :       if (w[LINFERR][i] > v[LINFERR][i]) v[LINFERR][i] = w[LINFERR][i];
     104                 :            :     // Sum of the total energy over the entire domain
     105                 :      26272 :     v[TOTALSOL][0] += w[TOTALSOL][0];
     106                 :            :     // Copy ITER, TIME, DT
     107         [ +  + ]:     105088 :     for (std::size_t j=v.size()-3; j<v.size(); ++j)
     108         [ +  + ]:     313002 :       for (std::size_t i=0; i<v[j].size(); ++i)
     109                 :     234186 :         v[j][i] = w[j][i];
     110                 :            :   }
     111                 :            : 
     112                 :            :   // Serialize concatenated diagnostics vector to raw stream
     113         [ +  - ]:       4961 :   auto stream = serialize( meshid, ncomp, v );
     114                 :            : 
     115                 :            :   // Forward serialized diagnostics
     116         [ +  - ]:       9922 :   return CkReductionMsg::buildNew( stream.first, stream.second.get() );
     117                 :            : }
     118                 :            : 
     119                 :            : } // inciter::