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/* Copyright 2019-2020 Michael Rowan, Yinjian Zhao
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_DIAGNOSTICS_REDUCEDDIAGS_LOADBALANCECOSTS_H_
#define WARPX_DIAGNOSTICS_REDUCEDDIAGS_LOADBALANCECOSTS_H_
#include "ReducedDiags.H"
#include <AMReX_Vector.H>
#include <string>
#include <vector>
/**
* This class mainly contains a function that update the
* costs (used in load balance) for writing to output.
*/
class LoadBalanceCosts : public ReducedDiags
{
public:
/** stores the host identifiers */
amrex::Vector<char> m_data_string_recvbuf;
/** length of the total string to be collected to IOProc */
int m_data_string_recvbuf_length = 0;
/** easier storage of strings after the MPI Gatherv */
std::vector<std::string> m_data_string;
/** stores information needed for MPI Gatherv */
amrex::Vector<int> m_data_string_recvcount; // array of size N_procs, how many message root recv from sender
amrex::Vector<int> m_data_string_disp; // array of size N_procs, where to place data in IOProc
/** number of data fields we save for each box
* (cost, processor, level, i_low, j_low, k_low, gpu_ID [if GPU run], num_cells, num_macro_particles
* note: the hostname per box is stored separately (in m_data_string) */
#ifdef AMREX_USE_GPU
const int m_nDataFields = 9;
#else
const int m_nDataFields = 8;
#endif
/** used to keep track of max number of boxes over all timesteps; this allows
* to compute the number of NaNs required to fill jagged array into a
* rectangular one */
int m_nBoxesMax = -1;
/**
* constructor
* @param[in] rd_name reduced diags names
*/
LoadBalanceCosts(std::string rd_name);
/**
* This function updates the costs, given the current distribution mapping,
* according to the number of particles and cells on the box
*
* @param[in] step current time step
*/
virtual void ComputeDiags(int step) override final;
/**
* write to file function for costs; this differs from the base class
* `ReducedDiags` in that it will fill in blank entries with NaN at the
* final timestep, ensuring that the data array is not jagged
*
* @param[in] step current time step
*/
virtual void WriteToFile(int step) const override final;
};
#endif
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