Add simple example of using GDS VFD

Author: jhendersonHDF

CMakeLists.txt

@@ -316,6 +316,14 @@ option(BUILD_DOCUMENTATION "Build documentation." ON)
 #  add_subdirectory(Documentation/Doxygen)
 #endif()
 
+#-----------------------------------------------------------------------------
+# Examples
+#-----------------------------------------------------------------------------
+option(BUILD_EXAMPLES "Build examples." ON)
+if(BUILD_EXAMPLES)
+  add_subdirectory(examples)
+endif()
+
 #-----------------------------------------------------------------------------
 # Testing
 #-----------------------------------------------------------------------------
@@ -398,4 +406,4 @@ if(NOT HDF5_VFD_GDS_EXTERNALLY_CONFIGURED)
   set(CPACK_SOURCE_IGNORE_FILES ".git*;/GitSetup/;/.git/;.swp$;.#;/#;.*~")
   set(CPACK_SOURCE_STRIP_FILES "")
   include(CPack)
-endif()
+endif()

examples/CMakeLists.txt

@@ -0,0 +1,37 @@
+cmake_minimum_required(VERSION 2.8.12.2 FATAL_ERROR)
+
+#------------------------------------------------------------------------------
+# Include source and build directories
+#------------------------------------------------------------------------------
+include_directories(
+  ${CMAKE_CURRENT_SOURCE_DIR}
+  ${CMAKE_CURRENT_BINARY_DIR}
+)
+
+#-----------------------------------------------------------------------------
+# Define Sources
+#-----------------------------------------------------------------------------
+set(examples
+  simple_dset_write
+)
+
+foreach (example ${examples})
+  add_executable (h5gds_${example}
+    ${CMAKE_CURRENT_SOURCE_DIR}/${example}.c
+  )
+  target_include_directories(h5gds_${example}
+    PUBLIC ${CMAKE_SOURCE_DIR}/src
+  )
+  target_include_directories(h5gds_${example}
+    PUBLIC  "$<BUILD_INTERFACE:${HDF5_VFD_GDS_BUILD_INCLUDE_DEPENDENCIES}>"
+            $<INSTALL_INTERFACE:${HDF5_VFD_GDS_INSTALL_INCLUDE_INTERFACE}>
+  )
+  target_include_directories(h5gds_${example}
+    SYSTEM PUBLIC ${HDF5_VFD_GDS_EXT_INCLUDE_DEPENDENCIES}
+  )
+  target_link_libraries(h5gds_${example}
+      ${HDF5_VFD_GDS_EXPORTED_LIBS}
+      ${HDF5_VFD_GDS_EXT_LIB_DEPENDENCIES}
+      ${HDF5_VFD_GDS_EXT_PKG_DEPENDENCIES}
+  )
+endforeach()

examples/simple_dset_write.c

@@ -0,0 +1,50 @@
+#include <hdf5.h>
+#include <cuda.h>
+#include <cuda_runtime.h>
+
+#include "H5FDgds.h"
+
+#define FILENAME "gds_simple_dset_write.h5"
+#define DIM_SIZE 10
+
+int
+main(int argc, char **argv)
+{
+    hsize_t  i, dims[] = { DIM_SIZE, DIM_SIZE };
+    hid_t    file_id = H5I_INVALID_HID;
+    hid_t    fapl_id = H5I_INVALID_HID;
+    hid_t    dset_id = H5I_INVALID_HID;
+    hid_t    space_id = H5I_INVALID_HID;
+    int      data[DIM_SIZE * DIM_SIZE];
+    int     *cuda_buf = NULL;
+
+    fapl_id = H5Pcreate(H5P_FILE_ACCESS);
+
+    H5Pset_fapl_gds(fapl_id, MBOUNDARY_DEF, FBSIZE_DEF, CBSIZE_DEF);
+
+    file_id = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+
+    space_id = H5Screate_simple(2, dims, NULL);
+
+    dset_id = H5Dcreate2(file_id, "dset", H5T_NATIVE_INT, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+
+    for (i = 0; i < dims[0] * dims[1]; i++)
+        data[i] = i;
+
+    /* Allocate memory on CUDA device and copy data into that buffer */
+    cudaMalloc((void **)&cuda_buf, DIM_SIZE * DIM_SIZE * sizeof(int));
+    cudaMemcpy(cuda_buf, data, DIM_SIZE * DIM_SIZE * sizeof(int), cudaMemcpyHostToDevice);
+
+    /* Write dataset using buffer allocated on CUDA device */
+    H5Dwrite(dset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, cuda_buf);
+
+    cudaFree(&cuda_buf);
+
+    H5Sclose(space_id);
+    H5Dclose(dset_id);
+    H5Pclose(fapl_id);
+    H5Fclose(file_id);
+
+    return 0;
+}
+

src/CMakeLists.txt

@@ -51,7 +51,7 @@ if(HDF5_VFD_GDS_ENABLE_COVERAGE)
   set_coverage_flags(hdf5_vfd_gds)
 endif()
 
-set(HDF5_VFD_GDS_EXPORTED_LIBS hdf5_vfd_gds ${HDF5_VFD_GDS_EXPORTED_LIBS})
+set(HDF5_VFD_GDS_EXPORTED_LIBS hdf5_vfd_gds ${HDF5_VFD_GDS_EXPORTED_LIBS} PARENT_SCOPE)
 
 #-----------------------------------------------------------------------------
 # Specify project header files to be installed