[svn-r6419]

Purpose:
    More test.
Description:
    Test independent read of groups and chunked dataset.
Solution:
    This test is similar to multiple group test.  So just add it in the
    testphdf5.c,h.
Platforms tested:
    modi4, eirene.

testpar/t_mdset.c

@@ -12,6 +12,7 @@ void write_dataset(hid_t, hid_t, hid_t);
 int  read_dataset(hid_t, hid_t, hid_t);
 void create_group_recursive(hid_t, hid_t, hid_t, int);
 void recursive_read_group(hid_t, hid_t, hid_t, int);
+void group_dataset_read(hid_t fid, int mpi_rank, int mpi_size, int m);
 void write_attribute(hid_t, int, int);
 int  read_attribute(hid_t, int, int);
 int  check_value(DATATYPE *, DATATYPE *);
@@ -201,6 +202,152 @@ void compact_dataset(char *filename)
     H5Fclose(iof);
 }
 
+/* Write multiple groups with a chunked dataset in each group collectively. 
+ * These groups and datasets are for testing independent read later.
+ */
+void collective_group_write(char *filename, int ngroups)
+{
+    int mpi_rank, mpi_size;
+    int i, j, m;
+    char gname[64], dname[32];
+    hid_t fid, gid, did, plist, dcpl, memspace, filespace;
+    DATATYPE outme[SIZE][SIZE];
+    hssize_t chunk_origin[DIM];
+    hsize_t chunk_dims[DIM], file_dims[DIM], count[DIM];
+    const hsize_t chunk_size[2] = {SIZE/2, SIZE/2};  /* Chunk dimensions */
+    herr_t ret1, ret2;
+
+    MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
+
+    plist = create_faccess_plist(MPI_COMM_WORLD, MPI_INFO_NULL, facc_type);
+    fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, plist);
+    H5Pclose(plist);
+
+    /* decide the hyperslab according to process number. */
+    get_slab(chunk_origin, chunk_dims, count, file_dims);  
+
+    /* select hyperslab in memory and file spaces.  These two operations are
+     * identical since the datasets are the same. */
+    memspace  = H5Screate_simple(DIM, file_dims, NULL);
+    ret1 = H5Sselect_hyperslab(memspace, H5S_SELECT_SET, chunk_origin, 
+                               chunk_dims, count, chunk_dims);
+    filespace = H5Screate_simple(DIM, file_dims,  NULL);
+    ret2 = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, chunk_origin, 
+                               chunk_dims, count, chunk_dims);
+    VRFY((memspace>=0), "memspace");
+    VRFY((filespace>=0), "filespace");
+    VRFY((ret1>=0), "mgroup memspace selection");
+    VRFY((ret2>=0), "mgroup filespace selection");   
+    
+    dcpl = H5Pcreate(H5P_DATASET_CREATE);
+    ret1 = H5Pset_chunk (dcpl, 2, chunk_size);
+    VRFY((dcpl>=0), "dataset creation property");
+    VRFY((ret1>=0), "set chunk for dataset creation property");
+        
+    /* creates ngroups groups under the root group, writes chunked 
+     * datasets in parallel. */
+    for(m = 0; m < ngroups; m++) {
+        sprintf(gname, "group%d", m);
+        gid = H5Gcreate(fid, gname, 0);
+        VRFY((gid > 0), gname);
+
+        sprintf(dname, "dataset%d", m);
+        did = H5Dcreate(gid, dname, H5T_NATIVE_INT, filespace, dcpl);
+        VRFY((did > 0), dname);
+
+        for(i=0; i < SIZE; i++)
+            for(j=0; j < SIZE; j++)
+     	        outme[i][j] = (i+j)*1000 + mpi_rank;
+
+        H5Dwrite(did, H5T_NATIVE_INT, memspace, filespace, H5P_DEFAULT, 
+                 outme);
+
+        H5Dclose(did);
+        H5Gclose(gid);
+
+#ifdef BARRIER_CHECKS
+        if(! ((m+1) % 10)) {
+            printf("created %d groups\n", m+1);
+            MPI_Barrier(MPI_COMM_WORLD);
+	}
+#endif /* BARRIER_CHECKS */
+    }
+   
+    H5Pclose(dcpl);
+    H5Sclose(filespace);
+    H5Sclose(memspace);
+    H5Fclose(fid);
+}
+
+/* Let two sets of processes open and read different groups and chunked 
+ * datasets independently. 
+ */
+void independent_group_read(char *filename, int ngroups)
+{
+    int      mpi_rank, mpi_size, m;
+    hid_t    plist, fid;
+
+    MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
+    
+    plist = create_faccess_plist(MPI_COMM_WORLD, MPI_INFO_NULL, facc_type);
+    fid = H5Fopen(filename, H5F_ACC_RDONLY, plist);
+    H5Pclose(plist);
+
+    /* open groups and read datasets. Odd number processes read even number 
+     * groups from the end; even number processes read odd number groups 
+     * from the beginning. */
+    if(mpi_rank%2==0) {
+        for(m=ngroups-1; m==0; m-=2) 
+            group_dataset_read(fid, mpi_rank, mpi_size, m);
+    } else {
+        for(m=0; m<ngroups; m+=2)
+            group_dataset_read(fid, mpi_rank, mpi_size, m);
+    }
+
+    H5Fclose(fid);
+}
+
+/* Open and read datasets and compare data */
+void group_dataset_read(hid_t fid, int mpi_rank, int mpi_size, int m)
+{
+    int      ret, i, j;
+    char     gname[64], dname[32];
+    hid_t    gid, did;
+    DATATYPE *outdata, *indata;
+
+    indata = (DATATYPE*)malloc(SIZE*SIZE*sizeof(DATATYPE));
+    outdata = (DATATYPE*)malloc(SIZE*SIZE*sizeof(DATATYPE));
+    
+    /* open every group under root group. */
+    sprintf(gname, "group%d", m);
+    gid = H5Gopen(fid, gname);
+    VRFY((gid > 0), gname);
+
+    /* check the data. */
+    sprintf(dname, "dataset%d", m);
+    did = H5Dopen(gid, dname);
+    VRFY((did>0), dname);
+
+    H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, indata);
+
+    /* this is the original value */
+    for(i=0; i<SIZE; i++)
+       for(j=0; j<SIZE; j++) { 
+           *outdata = (i+j)*1000 + mpi_rank;
+           outdata++;
+       }
+    outdata -= SIZE*SIZE;
+
+    /* compare the original value(outdata) to the value in file(indata).*/
+    ret = check_value(indata, outdata);
+    VRFY((ret==0), "check the data");
+
+    H5Dclose(did);
+    H5Gclose(gid);
+}
+
 /*
  * Example of using PHDF5 to create multiple groups.  Under the root group, 
  * it creates ngroups groups.  Under the first group just created, it creates