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[svn-r210] Changes since 19980130

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----------------------

./MANIFEST
./html/study.html		[NEW]
./html/study_1000x1000.gif	[NEW]
./html/study_250x250.gif	[NEW]
./html/study_499x499.gif	[NEW]
./html/study_5000x1000.gif	[NEW]
./html/study_500x500.gif	[NEW]
./html/study_p1.gif		[NEW]
./html/study_p1.obj		[NEW]
	The conclusions from a study of the HDF5 chunking
	layout. Shows overhead and disk seeking.
This commit is contained in:
Robb Matzke committed 1998-01-30 22:47:38 -05:00
1 parent 374e5ae39b
commit 8831ff175c
2 files changed
+11 -3
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MANIFEST
+8
View File
@@ -47,6 +47,14 @@
./html/review1.html
./html/review1a.html
./html/storage.html
./html/study.html
./html/study_1000x1000.gif
./html/study_250x250.gif
./html/study_499x499.gif
./html/study_5000x1000.gif
./html/study_500x500.gif
./html/study_p1.gif
./html/study_p1.obj
./html/symtab
./src/debug.c
./src/H5.c
test/extend.c
+3 -3
View File
@@ -39,6 +39,7 @@ main (void)
static int buf1[NY][NX], buf2[NX/2][NY/2];
static const size_t dims[2] = {NX, NY};
static const size_t half_dims[2] = {NX/2, NY/2};
static const size_t chunk_dims[2] = {NX/2, NY/2};
static size_t maxdims[2] = {H5P_UNLIMITED, H5P_UNLIMITED};
static size_t size[2];
int offset[2];
@@ -59,7 +60,7 @@ main (void)
/* Create the dataset which is originally NX by NY */
cparms = H5Ccreate (H5C_DATASET_CREATE);
assert (cparms>=0);
status = H5Cset_chunk (cparms, 2, dims);
status = H5Cset_chunk (cparms, 2, chunk_dims);
assert (status>=0);
dataset = H5Dcreate (file, "dataset", H5T_NATIVE_INT, mem_space, cparms);
assert (dataset>=0);
@@ -94,13 +95,13 @@ main (void)
/* Read the data */
mem_space = H5Pcreate_simple (2, half_dims, NULL);
file_space = H5Dget_space (dataset);
for (i=0; i<10; i++) {
for (j=0; j<10; j++) {
/* Select a hyperslab */
offset[0] = i * NX/2;
offset[1] = j * NY/2;
file_space = H5Dget_space (dataset);
assert (file_space>=0);
status = H5Pset_hyperslab (file_space, offset, half_dims, NULL);
assert (status>=0);
@@ -109,7 +110,6 @@ main (void)
status = H5Dread (dataset, H5T_NATIVE_INT, mem_space, file_space,
H5C_DEFAULT, buf2);
assert (status>=0);
H5Pclose (file_space);
/* Compare */
for (k=0; k<NX/2; k++) {