IOR_offset_t
IOR_Xfer_NCMPI(int access,
void * fd,
IOR_size_t * buffer,
IOR_offset_t length,
IOR_param_t * param)
{
char * bufferPtr = (char *)buffer;
static int firstReadCheck = FALSE,
startDataSet;
int var_id,
dim_id[NUM_DIMS];
MPI_Offset bufSize[NUM_DIMS],
offset[NUM_DIMS];
IOR_offset_t segmentPosition;
int segmentNum,
transferNum;
/* Wei-keng Liao: In IOR.c line 1979 says "block size must be a multiple
of transfer size." Hence, length should always == param->transferSize
below. I leave it here to double check.
*/
if (length != param->transferSize) {
char errMsg[256];
sprintf(errMsg,"length(%lld) != param->transferSize(%lld)\n",
length, param->transferSize);
NCMPI_CHECK(-1, errMsg);
}
/* determine by offset if need to start data set */
if (param->filePerProc == TRUE) {
segmentPosition = (IOR_offset_t)0;
} else {
segmentPosition = (IOR_offset_t)((rank + rankOffset) % param->numTasks)
* param->blockSize;
}
if ((int)(param->offset - segmentPosition) == 0) {
startDataSet = TRUE;
/*
* this toggle is for the read check operation, which passes through
* this function twice; note that this function will open a data set
* only on the first read check and close only on the second
*/
if (access == READCHECK) {
if (firstReadCheck == TRUE) {
firstReadCheck = FALSE;
} else {
firstReadCheck = TRUE;
}
}
}
if (startDataSet == TRUE &&
(access != READCHECK || firstReadCheck == TRUE)) {
if (access == WRITE) {
int numTransfers = param->blockSize / param->transferSize;
/* Wei-keng Liao: change 1D array to 3D array of dimensions:
[segmentCount*numTasksWorld][numTransfers][transferSize]
Requirement: none of these dimensions should be > 4G,
*/
NCMPI_CHECK(ncmpi_def_dim(*(int *)fd, "segments_times_np",
NC_UNLIMITED, &dim_id[0]),
"cannot define data set dimensions");
NCMPI_CHECK(ncmpi_def_dim(*(int *)fd, "number_of_transfers",
numTransfers, &dim_id[1]),
"cannot define data set dimensions");
NCMPI_CHECK(ncmpi_def_dim(*(int *)fd, "transfer_size",
param->transferSize, &dim_id[2]),
"cannot define data set dimensions");
NCMPI_CHECK(ncmpi_def_var(*(int *)fd, "data_var", NC_BYTE,
NUM_DIMS, dim_id, &var_id),
"cannot define data set variables");
NCMPI_CHECK(ncmpi_enddef(*(int *)fd),
"cannot close data set define mode");
} else {
NCMPI_CHECK(ncmpi_inq_varid(*(int *)fd, "data_var", &var_id),
"cannot retrieve data set variable");
}
if (param->collective == FALSE) {
NCMPI_CHECK(ncmpi_begin_indep_data(*(int *)fd),
"cannot enable independent data mode");
}
param->var_id = var_id;
startDataSet = FALSE;
}
var_id = param->var_id;
/* Wei-keng Liao: calculate the segment number */
segmentNum = param->offset / (param->numTasks * param->blockSize);
/* Wei-keng Liao: calculate the transfer number in each block */
transferNum = param->offset % param->blockSize / param->transferSize;
/* Wei-keng Liao: read/write the 3rd dim of the dataset, each is of
amount param->transferSize */
bufSize[0] = 1;
bufSize[1] = 1;
bufSize[2] = param->transferSize;
offset[0] = segmentNum * numTasksWorld + rank;
offset[1] = transferNum;
offset[2] = 0;
/* access the file */
if (access == WRITE) { /* WRITE */
if (param->collective) {
NCMPI_CHECK(ncmpi_put_vara_all(*(int *)fd, var_id, offset, bufSize,
bufferPtr, length, MPI_BYTE),
"cannot write to data set");
} else {
NCMPI_CHECK(ncmpi_put_vara(*(int *)fd, var_id, offset, bufSize,
bufferPtr, length, MPI_BYTE),
"cannot write to data set");
}
} else { /* READ or CHECK */
if (param->collective == TRUE) {
NCMPI_CHECK(ncmpi_get_vara_all(*(int *)fd, var_id, offset, bufSize,
bufferPtr, length, MPI_BYTE),
"cannot read from data set");
} else {
NCMPI_CHECK(ncmpi_get_vara(*(int *)fd, var_id, offset, bufSize,
bufferPtr, length, MPI_BYTE),
"cannot read from data set");
}
}
return(length);
} /* IOR_Xfer_NCMPI() */
/*
* adapted from HydroRunBaseMpi::outputPnetcdf
*
* assumes here that localData have size nx,ny,nz (no ghostWidth)
*
* see : test_pnetcdf_write.cpp
*
* Note that if ghostIncluded is false local_data must be sized upon nx,ny,nz
* if not size must be nx+2*ghostWidth,ny+2*ghostWidth,nz+2*ghostWidth
*
*/
void write_pnetcdf(const std::string &filename,
HostArray<double> &localData,
ConfigMap &configMap)
{
int myRank;
MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
// read local domain sizes
int nx=configMap.getInteger("mesh","nx",32);
int ny=configMap.getInteger("mesh","ny",32);
int nz=configMap.getInteger("mesh","nz",32);
// read mpi geometry
int mx=configMap.getInteger("mpi","mx",1);
int my=configMap.getInteger("mpi","my",1);
int mz=configMap.getInteger("mpi","mz",1);
// MPI cartesian coordinates
// myRank = mpiCoord[0] + mx*mpiCoord[1] + mx*my*mpiCoord[2]
int mpiCoord[3];
{
mpiCoord[2] = myRank/(mx*my);
mpiCoord[1] = (myRank - mx*my*mpiCoord[2])/mx;
mpiCoord[0] = myRank - mx*my*mpiCoord[2] -mx*mpiCoord[1];
}
bool ghostIncluded = configMap.getBool("output", "ghostIncluded",false);
int ghostWidth = configMap.getInteger("mesh","ghostWidth",3);
// global size
int NX=nx*mx, NY=ny*my, NZ=nz*mz;
int gsizes[3];
gsizes[IZ] = NX;
gsizes[IY] = NY;
gsizes[IX] = NZ;
if ( ghostIncluded ) {
gsizes[IZ] += 2*ghostWidth;
gsizes[IY] += 2*ghostWidth;
gsizes[IX] += 2*ghostWidth;
}
// netcdf file id
int ncFileId;
int err;
// file creation mode
int ncCreationMode = NC_CLOBBER;
bool useCDF5 = configMap.getBool("output","pnetcdf_cdf5",false);
if (useCDF5)
ncCreationMode = NC_CLOBBER|NC_64BIT_DATA;
else // use CDF-2 file format
ncCreationMode = NC_CLOBBER|NC_64BIT_OFFSET;
// verbose log ?
bool pnetcdf_verbose = configMap.getBool("output","pnetcdf_verbose",false);
int nbVar=8;
int dimIds[3], varIds[nbVar];
MPI_Offset write_size, sum_write_size;
MPI_Info mpi_info_used;
char str[512];
// time measurement variables
double write_timing, max_write_timing, write_bw;
/*
* writing parameter (offset and size)
*/
MPI_Offset starts[3] = {0};
MPI_Offset counts[3] = {nz, ny, nx};
// take care that row-major / column major format
starts[IZ] = mpiCoord[IX]*nx;
starts[IY] = mpiCoord[IY]*ny;
starts[IX] = mpiCoord[IZ]*nz;
if ( ghostIncluded ) {
if ( mpiCoord[IX] == 0 )
counts[IZ] += ghostWidth;
if ( mpiCoord[IY] == 0 )
counts[IY] += ghostWidth;
if ( mpiCoord[IZ] == 0 )
counts[IX] += ghostWidth;
if ( mpiCoord[IX] == mx-1 )
counts[IZ] += ghostWidth;
if ( mpiCoord[IY] == my-1 )
counts[IY] += ghostWidth;
if ( mpiCoord[IZ] == mz-1 )
counts[IX] += ghostWidth;
starts[IZ] += ghostWidth;
starts[IY] += ghostWidth;
starts[IX] += ghostWidth;
if ( mpiCoord[IX] == 0 )
starts[IZ] -= ghostWidth;
if ( mpiCoord[IY] == 0 )
starts[IY] -= ghostWidth;
if ( mpiCoord[IZ] == 0 )
starts[IX] -= ghostWidth;
}
/*
* Create NetCDF file
*/
err = ncmpi_create(MPI_COMM_WORLD, filename.c_str(),
ncCreationMode,
MPI_INFO_NULL, &ncFileId);
if (err != NC_NOERR) {
printf("Error: ncmpi_create() file %s (%s)\n",filename.c_str(),ncmpi_strerror(err));
MPI_Abort(MPI_COMM_WORLD, -1);
exit(1);
}
/*
* Define dimensions
*/
err = ncmpi_def_dim(ncFileId, "x", gsizes[0], &dimIds[0]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_dim(ncFileId, "y", gsizes[1], &dimIds[1]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_dim(ncFileId, "z", gsizes[2], &dimIds[2]);
PNETCDF_HANDLE_ERROR;
/*
* Define variables
*/
nc_type ncDataType = NC_DOUBLE;
MPI_Datatype mpiDataType = MPI_DOUBLE;
err = ncmpi_def_var(ncFileId, "rho", ncDataType, 3, dimIds, &varIds[ID]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "E", ncDataType, 3, dimIds, &varIds[IP]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "rho_vx", ncDataType, 3, dimIds, &varIds[IU]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "rho_vy", ncDataType, 3, dimIds, &varIds[IV]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "rho_vz", ncDataType, 3, dimIds, &varIds[IW]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "Bx", ncDataType, 3, dimIds, &varIds[IA]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "By", ncDataType, 3, dimIds, &varIds[IB]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_var(ncFileId, "Bz", ncDataType, 3, dimIds, &varIds[IC]);
PNETCDF_HANDLE_ERROR;
/*
* global attributes
*/
// did we use CDF-2 or CDF-5
{
int useCDF5_int = useCDF5 ? 1 : 0;
err = ncmpi_put_att_int(ncFileId, NC_GLOBAL, "CDF-5 mode", NC_INT, 1, &useCDF5_int);
PNETCDF_HANDLE_ERROR;
}
/*
* exit the define mode
*/
err = ncmpi_enddef(ncFileId);
PNETCDF_HANDLE_ERROR;
/*
* Get all the MPI_IO hints used
*/
err = ncmpi_get_file_info(ncFileId, &mpi_info_used);
PNETCDF_HANDLE_ERROR;
int nItems = counts[IX]*counts[IY]*counts[IZ];
for (int iVar=0; iVar<nbVar; iVar++) {
double *data = &(localData(0,0,0,iVar));
err = ncmpi_put_vara_all(ncFileId, varIds[iVar], starts, counts, data, nItems, mpiDataType);
PNETCDF_HANDLE_ERROR;
}
/*
* close the file
*/
err = ncmpi_close(ncFileId);
PNETCDF_HANDLE_ERROR;
} // write_pnetcdf
/**
* Write a parallel-nedcdf file.
*
* We assume here that localData is a scalar.
*
* Pnetcdf uses row-major format (same as FFTW).
*
* \param[in] filename : PnetCDF filename
* \param[in] starts : offset to where to start reading data
* \param[in] counts : number of elements read (3D sub-domain inside global)
* \param[in] gsizes : global sizes
* \param[in] localData : actual data buffer (size : nx*ny*nz*sizeof(float))
*
*/
void write_pnetcdf(const std::string &filename,
MPI_Offset starts[3],
MPI_Offset counts[3],
int gsizes[3],
float *localData)
{
int myRank;
MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
// netcdf file id
int ncFileId;
int err;
// file creation mode
int ncCreationMode = NC_CLOBBER;
// CDF-5 is almost mandatory for very large files (>= 2x10^9 cells)
// not useful here
bool useCDF5 = false;
if (useCDF5)
ncCreationMode = NC_CLOBBER|NC_64BIT_DATA;
else // use CDF-2 file format
ncCreationMode = NC_CLOBBER|NC_64BIT_OFFSET;
// verbose log ?
//bool pnetcdf_verbose = false;
int nbVar=1;
int dimIds[3], varIds[nbVar];
//MPI_Offset write_size, sum_write_size;
MPI_Info mpi_info_used;
//char str[512];
// time measurement variables
//float write_timing, max_write_timing, write_bw;
/*
* Create NetCDF file
*/
err = ncmpi_create(MPI_COMM_WORLD, filename.c_str(),
ncCreationMode,
MPI_INFO_NULL, &ncFileId);
if (err != NC_NOERR) {
printf("Error: ncmpi_create() file %s (%s)\n",filename.c_str(),ncmpi_strerror(err));
MPI_Abort(MPI_COMM_WORLD, -1);
exit(1);
}
/*
* Define global dimensions
*/
err = ncmpi_def_dim(ncFileId, "x", gsizes[0], &dimIds[0]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_dim(ncFileId, "y", gsizes[1], &dimIds[1]);
PNETCDF_HANDLE_ERROR;
err = ncmpi_def_dim(ncFileId, "z", gsizes[2], &dimIds[2]);
PNETCDF_HANDLE_ERROR;
/*
* Define variables to write (give a name)
*/
nc_type ncDataType = NC_FLOAT;
MPI_Datatype mpiDataType = MPI_FLOAT;
err = ncmpi_def_var(ncFileId, "data", ncDataType, 3, dimIds, &varIds[0]);
PNETCDF_HANDLE_ERROR;
/*
* global attributes
*/
// did we use CDF-2 or CDF-5
{
int useCDF5_int = useCDF5 ? 1 : 0;
err = ncmpi_put_att_int(ncFileId, NC_GLOBAL, "CDF-5 mode", NC_INT, 1, &useCDF5_int);
PNETCDF_HANDLE_ERROR;
}
/*
* exit the define mode
*/
err = ncmpi_enddef(ncFileId);
PNETCDF_HANDLE_ERROR;
/*
* Get all the MPI_IO hints used
*/
err = ncmpi_get_file_info(ncFileId, &mpi_info_used);
PNETCDF_HANDLE_ERROR;
// copy data to write in intermediate buffer
int nItems = counts[IX]*counts[IY]*counts[IZ];
{
// debug
// printf("Pnetcdf [rank=%d] starts=%lld %lld %lld, counts =%lld %lld %lld, gsizes=%d %d %d\n",
// myRank,
// starts[0],starts[1],starts[2],
// counts[0],counts[1],counts[2],
// gsizes[0],gsizes[1],gsizes[2]);
/*
* make sure PNetCDF doesn't complain when starts is outside of global domain
* bound. When nItems is null, off course we don't write anything, but starts
* offset have to be inside global domain.
* So there is no harm, setting starts to origin.
*/
if (nItems == 0) {
starts[0]=0;
starts[1]=0;
starts[2]=0;
}
err = ncmpi_put_vara_all(ncFileId,
varIds[0],
starts,
counts,
localData,
nItems,
mpiDataType);
PNETCDF_HANDLE_ERROR;
}
/*
* close the file
*/
err = ncmpi_close(ncFileId);
PNETCDF_HANDLE_ERROR;
} // write_pnetcdf
int main(int argc, char **argv) {
int ret, ncfile, nprocs, rank, dimid, varid1, varid2, ndims=1;
MPI_Offset start, count=1;
char buf[13] = "Hello World\n";
int data;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
if (argc != 2) {
if (rank == 0) printf("Usage: %s filename\n", argv[0]);
MPI_Finalize();
exit(-1);
}
ret = ncmpi_create(MPI_COMM_WORLD, argv[1],
NC_CLOBBER|NC_64BIT_OFFSET, MPI_INFO_NULL, &ncfile);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
ret = ncmpi_def_dim(ncfile, "d1", nprocs, &dimid);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
ret = ncmpi_def_var(ncfile, "v1", NC_INT, ndims, &dimid, &varid1);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
ret = ncmpi_def_var(ncfile, "v2", NC_INT, ndims, &dimid, &varid2);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
ret = ncmpi_put_att_text(ncfile, NC_GLOBAL, "string", 13, buf);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
/* all processors defined the dimensions, attributes, and variables,
* but here in ncmpi_enddef is the one place where metadata I/O
* happens. Behind the scenes, rank 0 takes the information and writes
* the netcdf header. All processes communicate to ensure they have
* the same (cached) view of the dataset */
ret = ncmpi_enddef(ncfile);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
start=rank, count=1, data=rank;
/* in this simple example every process writes its rank to two 1d variables */
/* we used a basic MPI_INT type to this flexible mode call, but could
* have used any derived MPI datatype that describes application data
* structures */
ret = ncmpi_put_vara_all(ncfile, varid1, &start, &count, &data, count, MPI_INT);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
ret = ncmpi_put_vara_all(ncfile, varid2, &start, &count, &data, count, MPI_INT);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
ret = ncmpi_close(ncfile);
if (ret != NC_NOERR) handle_error(ret, __LINE__);
MPI_Finalize();
return 0;
}
