Hello,
I am quite new to HDF5 so this might probably be a beginners question:
I want to create and access different datasets depending on my mpi rank.
Accessing parts of one dataset via hyperslabs works perfect, but the
following doesn't work:
I want to write the name of each processor in a different dataset which
is named 'attr_processor_[mpi_rank]'. However, it will only create one
dataset named 'attr_processor_0'.
plist_id = H5Pcreate(H5P_FILE_ACCESS);
H5Pset_fapl_mpio(plist_id, mpi_comm, MPI_INFO_NULL);
file_id = H5Fcreate("test.h5", H5F_ACC_TRUNC, H5P_DEFAULT,
plist_id);
H5Pclose(plist_id);
... // some hsize_t initializations and so on
hid_t procs_dataset_id;
hid_t proc_name_t;
// datatype for processor name
proc_name_t = H5Tcopy(H5T_C_S1);
H5Tset_size(proc_name_t, MPI_MAX_PROCESSOR_NAME + 1);
plist_id = H5Pcreate(H5P_DATASET_XFER);
H5Pset_dxpl_mpio(plist_id, H5FD_MPIO_INDEPENDENT);
// create dataset
char *proc_dataset_name = new char[256];
hid_t proc_dataset_space = H5Screate(H5S_SCALAR);
memset(proc_dataset_name, 0, 256);
sprintf(proc_dataset_name, "%s_%d", "attr_processor", mpi_rank);
procs_dataset_id = H5Dcreate(group_id, proc_dataset_name,
proc_name_t, proc_dataset_space, H5P_DEFAULT);
// retrieve mpi processor name
char *proc_name = new char[MPI_MAX_PROCESSOR_NAME + 1];
int result_len = 0;
MPI_Get_processor_name(proc_name, &result_len);
proc_name[result_len] = 0;
// write processor name
H5Dwrite(procs_dataset_id, proc_name_t, proc_dataset_space,
proc_dataset_space, plist_id, proc_name);
// cleanup
H5Dclose(procs_dataset_id);
H5Sclose(proc_dataset_space);
H5Pclose(plist_id);
delete[] proc_dataset_name;
delete[] proc_name;
... // writing the actual data
Thanks for replying.
Felix
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