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Diffstat (limited to 'examples/h5_vds-percival.c')
| -rw-r--r-- | examples/h5_vds-percival.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/examples/h5_vds-percival.c b/examples/h5_vds-percival.c new file mode 100644 index 0000000..757bb69 --- /dev/null +++ b/examples/h5_vds-percival.c @@ -0,0 +1,242 @@ +/************************************************************ + + This example illustrates the concept of the virtual dataset. + Percival use case. Every fifth 10x10 plane in VDS is stored in + the corresponding 3D unlimited dataset. + EIP: For now we will use finite dimension. + There are 4 source datasets total. + This file is intended for use with HDF5 Library version 1.10 + + ************************************************************/ +/* EIP Add link to the picture */ + +#include "hdf5.h" +#include <stdio.h> +#include <stdlib.h> + +#define FILE "vds-percival.h5" +#define DATASET "VDS-Percival" +/* later +#define VDSDIM0 H5S_UNLIMITED +*/ +#define VDSDIM0 40 +#define VDSDIM1 10 +#define VDSDIM2 10 +/* later +#define DIM0 H5S_UNLIMITED +*/ +#define DIM0 10 +#define DIM1 10 +#define DIM2 10 +#define RANK 3 +#define PLANE_STRIDE 4 + +const char *SRC_FILE[] = { + "a.h5", + "b.h5", + "c.h5", + "d.h5" +}; + +const char *SRC_DATASET[] = { + "A", + "B", + "C", + "D" +}; + +int +main (void) +{ + hid_t file, src_space, vspace, + dset; /* Handles */ + hid_t dcpl; + herr_t status; + hsize_t vdsdims[3] = {VDSDIM0, VDSDIM1, VDSDIM2}, + vdsdims_max[3] = {VDSDIM0, VDSDIM1, VDSDIM2}, + dims[3] = {DIM0, DIM1, DIM2}, + dims_max[3] = {DIM0, DIM1, DIM2}, + start[3], /* Hyperslab start parameter for VDS */ + stride[3], + count[3], + src_count[3], + block[3]; + hsize_t start_out[3], /* Hyperslab parameter out */ + stride_out[3], + count_out[3], + block_out[3]; + int i, j; + H5D_layout_t layout; /* Storage layout */ + size_t num_map; /* Number of mappings */ + ssize_t len; /* Length of the string; also a return value */ + char *filename; + char *dsetname; + int wdata[DIM0*DIM1*DIM2]; + + /* + * Create source files and datasets. This step is optional. + */ + for (i=0; i < PLANE_STRIDE; i++) { + /* + * Initialize data for i-th source dataset. + */ + for (j = 0; j < DIM0*DIM1*DIM2; j++) wdata[j] = i+1; + + /* + * Create the source files and datasets. Write data to each dataset and + * close all resources. + */ + + file = H5Fcreate (SRC_FILE[i], H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); + src_space = H5Screate_simple (RANK, dims, NULL); + dset = H5Dcreate2 (file, SRC_DATASET[i], H5T_NATIVE_INT, src_space, H5P_DEFAULT, + H5P_DEFAULT, H5P_DEFAULT); + status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, + wdata); + status = H5Sclose (src_space); + status = H5Dclose (dset); + status = H5Fclose (file); + } + + file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); + + /* Create VDS dataspace. */ + vspace = H5Screate_simple (RANK, vdsdims, vdsdims_max); + + /* Create dataspaces for the source dataset. */ + src_space = H5Screate_simple (RANK, dims, dims_max); + + /* Create VDS creation property */ + dcpl = H5Pcreate (H5P_DATASET_CREATE); + + /* Initialize hyperslab values */ + + start[0] = 0; + start[1] = 0; + start[2] = 0; + stride[0] = PLANE_STRIDE; /* we will select every fifth plane in VDS */ + stride[1] = 1; + stride[2] = 1; +/* later + count[0] = H5S_UNLIMITED; +*/ + count[0] = VDSDIM0/4; + count[1] = 1; + count[2] = 1; +/* later + src_count[0] = H5S_UNLIMITED; +*/ + src_count[0] = DIM0; + src_count[1] = 1; + src_count[2] = 1; + block[0] = 1; + block[1] = DIM1; + block[2] = DIM2; + + /* + * Build the mappings + * + */ + status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, src_count, block); + for (i=0; i < PLANE_STRIDE; i++) { + status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, stride, count, block); + status = H5Pset_virtual (dcpl, vspace, SRC_FILE[i], SRC_DATASET[i], src_space); + start[0]++; + } + + H5Sselect_none(vspace); + + /* Create a virtual dataset */ + dset = H5Dcreate2 (file, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT, + dcpl, H5P_DEFAULT); + status = H5Sclose (vspace); + status = H5Sclose (src_space); + status = H5Dclose (dset); + status = H5Fclose (file); + + /* + * Now we begin the read section of this example. + */ + + /* + * Open file and dataset using the default properties. + */ + file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT); + dset = H5Dopen2 (file, DATASET, H5P_DEFAULT); + + /* + * Get creation property list and mapping properties. + */ + dcpl = H5Dget_create_plist (dset); + + /* + * Get storage layout. + */ + layout = H5Pget_layout (dcpl); + + if (H5D_VIRTUAL == layout) + printf(" Dataset has a virtual layout \n"); + else + printf(" Wrong layout found \n"); + + /* + * Find number of mappings. + */ + status = H5Pget_virtual_count (dcpl, &num_map); + printf(" Number of mappings is %lu\n", (unsigned long)num_map); + + /* + * Get mapping parameters for each mapping. + */ + for (i = 0; i < (int)num_map; i++) { + printf(" Mapping %d \n", i); + printf(" Selection in the virtual dataset \n"); + /* Get selection in the virttual dataset */ + vspace = H5Pget_virtual_vspace (dcpl, (size_t)i); + if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) { + if (H5Sis_regular_hyperslab(vspace)) { + status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out); + printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]); + printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]); + printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]); + printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]); + } + } + /* Get source file name */ + len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0); + filename = (char *)malloc((size_t)len*sizeof(char)+1); + H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1); + printf(" Source filename %s\n", filename); + + /* Get source dataset name */ + len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0); + dsetname = (char *)malloc((size_t)len*sizeof(char)+1); + H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1); + printf(" Source dataset name %s\n", dsetname); + + /* Get selection in the source dataset */ + printf(" Selection in the source dataset \n"); + src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i); + if (H5Sget_select_type(src_space) == H5S_SEL_HYPERSLABS) { + if (H5Sis_regular_hyperslab(src_space)) { + status = H5Sget_regular_hyperslab (src_space, start_out, stride_out, count_out, block_out); + printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]); + printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]); + printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]); + printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]); + } + } + H5Sclose(vspace); + H5Sclose(src_space); + free(filename); + free(dsetname); + } + /* + * Close and release resources. + */ + status = H5Pclose (dcpl); + status = H5Dclose (dset); + status = H5Fclose (file); + return 0; +} + |