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authorRaymond Lu <songyulu@hdfgroup.org>2006-10-16 22:31:27 (GMT)
committerRaymond Lu <songyulu@hdfgroup.org>2006-10-16 22:31:27 (GMT)
commit775bd09974b4681672bce3c1a10948bad5d482da (patch)
tree14aaf01cf1198c940af53fe05ad7fcb3ef547189 /src
parentcaf3fa51d8b4082bfa7208a68b835fa5059a78ee (diff)
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[svn-r12766] Made two changes to Direct I/O VFD: first added 3 parameters to H5Pset_fapl_direct to control
memory boundary, file block size, and maximal copy buffer size; second in H5FD_direct_write and H5FD_direct_read, the library checks whether data buffer is aligned. If it is, then write and read the data directly instead of making a copy buffer.
Diffstat (limited to 'src')
-rw-r--r--src/H5FDdirect.c291
-rw-r--r--src/H5FDdirect.h3
2 files changed, 170 insertions, 124 deletions
diff --git a/src/H5FDdirect.c b/src/H5FDdirect.c
index 36dae03..3815cc1 100644
--- a/src/H5FDdirect.c
+++ b/src/H5FDdirect.c
@@ -144,8 +144,11 @@ typedef struct H5FD_direct_t {
HADDR_UNDEF==(A)+(Z) || \
(file_offset_t)((A)+(Z))<(file_offset_t)(A))
-/* Hard-code file system block size */
-#define FBSIZE 4096
+/* Global variables for memory boundary, file block size, and maximal copy buffer size.
+ * They can be changed through function H5Pset_fapl_direct. */
+hsize_t _boundary = 4096;
+hsize_t _fbsize = 4096;
+hsize_t _cbsize = 128*1024*1024;
/* Prototypes */
static H5FD_t *H5FD_direct_open(const char *name, unsigned flags, hid_t fapl_id,
@@ -299,7 +302,7 @@ H5FD_direct_term(void)
*-------------------------------------------------------------------------
*/
herr_t
-H5Pset_fapl_direct(hid_t fapl_id)
+H5Pset_fapl_direct(hid_t fapl_id, hsize_t boundary, hsize_t block_size, hsize_t cbuf_size)
{
H5P_genplist_t *plist; /* Property list pointer */
herr_t ret_value;
@@ -310,6 +313,13 @@ H5Pset_fapl_direct(hid_t fapl_id)
if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
+ if(boundary != 0)
+ _boundary = boundary;
+ if(block_size != 0)
+ _fbsize = block_size;
+ if(cbuf_size != 0)
+ _cbsize = cbuf_size;
+
ret_value= H5P_set_driver(plist, H5FD_DIRECT, NULL);
done:
@@ -726,59 +736,79 @@ H5FD_direct_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, ha
if (addr+size>file->eoa)
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow")
- /* memory page size needed for the Direct IO option. Make a bigger
- * buffer for aligned I/O. */
- mem_page_size = getpagesize();
- alloc_size = (size / FBSIZE + 1) * FBSIZE + FBSIZE;
- if (posix_memalign(&copy_buf, mem_page_size, alloc_size) != 0)
- HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "posix_memalign failed")
- memset(copy_buf, 0, alloc_size);
-
- /* look for the aligned position for reading the data */
- if(file_seek(file->fd, (file_offset_t)(addr - addr % FBSIZE), SEEK_SET) < 0)
- HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
-
- /*
- * Read the aligned data in file first, being careful of interrupted system calls,
- * partial results, and the end of the file.
- */
- p1 = copy_buf;
- while(alloc_size > 0) {
- do {
- nbytes = HDread(file->fd, p1, alloc_size);
- } while(-1==nbytes && EINTR==errno);
-
- if (-1==nbytes) /* error */
- HSYS_GOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
- if (0==nbytes) {
- /* end of file but not end of format address space */
- break;
- } else {
- assert(nbytes>0);
- assert((size_t)nbytes<=alloc_size);
- H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
- H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
- alloc_size -= (size_t)nbytes;
- p1 = (unsigned char*)p1 + nbytes;
- }
+ if((addr%_fbsize==0) && (size%_fbsize==0) && ((haddr_t)buf%_fbsize==0)) {
+ while (size>0) {
+ do {
+ nbytes = HDread(file->fd, buf, size);
+ } while (-1==nbytes && EINTR==errno);
+ if (-1==nbytes) /* error */
+ HSYS_GOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
+ if (0==nbytes) {
+ /* end of file but not end of format address space */
+ HDmemset(buf, 0, size);
+ break;
+ }
+ assert(nbytes>=0);
+ assert((size_t)nbytes<=size);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
+ size -= (size_t)nbytes;
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
+ addr += (haddr_t)nbytes;
+ buf = (char*)buf + nbytes;
+ }
+ } else {
+ /* allocate memory needed for the Direct IO option. Make a bigger
+ * buffer for aligned I/O. */
+ alloc_size = (size / _fbsize + 1) * _fbsize + _fbsize;
+ if (posix_memalign(&copy_buf, _boundary, alloc_size) != 0)
+ HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "posix_memalign failed")
+ memset(copy_buf, 0, alloc_size);
+
+ /* look for the aligned position for reading the data */
+ if(file_seek(file->fd, (file_offset_t)(addr - addr % _fbsize), SEEK_SET) < 0)
+ HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
+
+ /*
+ * Read the aligned data in file first, being careful of interrupted system calls,
+ * partial results, and the end of the file.
+ */
+ p1 = copy_buf;
+ while(alloc_size > 0) {
+ do {
+ nbytes = HDread(file->fd, p1, alloc_size);
+ } while(-1==nbytes && EINTR==errno);
+
+ if (-1==nbytes) /* error */
+ HSYS_GOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
+ if (0==nbytes) {
+ /* end of file but not end of format address space */
+ break;
+ } else {
+ assert(nbytes>0);
+ assert((size_t)nbytes<=alloc_size);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
+ alloc_size -= (size_t)nbytes;
+ p1 = (unsigned char*)p1 + nbytes;
+ }
+ }
+
+ /*look for the right position to copy the data and copy the data
+ *to the original buffer.*/
+ p2 = (unsigned char*)copy_buf + addr % _fbsize;
+ memcpy(buf, p2, size);
+
+ /*update address and buffer*/
+ addr += (haddr_t)size;
+ buf = (unsigned char*)buf + size;
+
+ HDfree(copy_buf);
}
- /*look for the right position to copy the data and copy the data
- *to the original buffer.*/
- p2 = (unsigned char*)copy_buf + addr % FBSIZE;
- memcpy(buf, p2, size);
-
- /*update address and buffer*/
- addr += (haddr_t)size;
- buf = (unsigned char*)buf + size;
-
/* Update current position */
file->pos = addr;
file->op = OP_READ;
- if(((addr % FBSIZE != 0) || (size % FBSIZE != 0)) && copy_buf)
- HDfree(copy_buf);
-
done:
if(ret_value<0) {
/* Reset last file I/O information */
@@ -831,87 +861,102 @@ H5FD_direct_write(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, h
if (addr+size>file->eoa)
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow")
- /* memory page size needed for the Direct IO option. Make a
- * bigger buffer for aligned I/O
- */
- mem_page_size = getpagesize();
- alloc_size = (size / FBSIZE + 1) * FBSIZE + FBSIZE;
- if (posix_memalign(&copy_buf, mem_page_size, alloc_size) != 0)
- HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "posix_memalign failed")
- memset(copy_buf, 0, alloc_size);
-
- /* look for the right position for reading the data */
- if(file_seek(file->fd, (file_offset_t)(addr - addr % FBSIZE), SEEK_SET) < 0)
- HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
-
- /*
- * Read the aligned data first, being careful of interrupted system calls,
- * partial results, and the end of the file.
- */
- p2 = copy_buf;
- dup_size = alloc_size;
- while(dup_size > 0) {
- do {
- nbytes = read(file->fd, p2, dup_size);
- } while (-1==nbytes && EINTR==errno);
- if (-1==nbytes) /* error */
- HSYS_GOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
- if (0==nbytes) {
- /* end of file but not end of format address space */
- break;
- } else {
- assert(nbytes>0);
- assert((size_t)nbytes<=dup_size);
- H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
- H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
- dup_size -= (size_t)nbytes;
- p2 = (unsigned char*)p2 + nbytes;
- }
- }
-
- /*append or copy the data to be written to the aligned buffer.*/
- p1 = (unsigned char*)copy_buf + addr % FBSIZE;
- memcpy(p1, buf, size);
-
- /*look for the aligned position for writing the data*/
- if(file_seek(file->fd, (file_offset_t)(addr - addr % FBSIZE), SEEK_SET) < 0)
- HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
-
- /*
- * Write the data, being careful of interrupted system calls and partial write.
- * It doesn't truncate the extra data introduced by alignment because that step
- * is done in H5FD_direct_flush.
- */
- p2 = copy_buf;
- while (alloc_size>0) {
- do {
- nbytes = HDwrite(file->fd, p2, alloc_size);
- } while (-1==nbytes && EINTR==errno);
-
- if (-1==nbytes) { /* error */
- HSYS_GOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed")
- }
- assert(nbytes>0);
- assert((size_t)nbytes<=alloc_size);
- H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
- H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
- alloc_size -= (size_t)nbytes;
- p2 = (unsigned char*)p2 + nbytes;
+ if((addr%_fbsize==0) && (size%_fbsize==0) && ((haddr_t)buf%_fbsize==0)) {
+ while (size>0) {
+ do {
+ nbytes = HDwrite(file->fd, buf, size);
+ } while (-1==nbytes && EINTR==errno);
+ if (-1==nbytes) /* error */
+ HSYS_GOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed")
+ assert(nbytes>0);
+ assert((size_t)nbytes<=size);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
+ size -= (size_t)nbytes;
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
+ addr += (haddr_t)nbytes;
+ buf = (const char*)buf + nbytes;
+ }
+ } else {
+ /* allocate memory needed for the Direct IO option. Make a
+ * bigger buffer for aligned I/O
+ */
+ alloc_size = (size / _fbsize + 1) * _fbsize + _fbsize;
+ if (posix_memalign(&copy_buf, _boundary, alloc_size) != 0)
+ HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "posix_memalign failed")
+ memset(copy_buf, 0, alloc_size);
+
+ /* look for the right position for reading the data */
+ if(file_seek(file->fd, (file_offset_t)(addr - addr % _fbsize), SEEK_SET) < 0)
+ HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
+
+ /*
+ * Read the aligned data first, being careful of interrupted system calls,
+ * partial results, and the end of the file.
+ */
+ p2 = copy_buf;
+ dup_size = alloc_size;
+ while(dup_size > 0) {
+ do {
+ nbytes = read(file->fd, p2, dup_size);
+ } while (-1==nbytes && EINTR==errno);
+ if (-1==nbytes) /* error */
+ HSYS_GOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
+ if (0==nbytes) {
+ /* end of file but not end of format address space */
+ break;
+ } else {
+ assert(nbytes>0);
+ assert((size_t)nbytes<=dup_size);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
+ dup_size -= (size_t)nbytes;
+ p2 = (unsigned char*)p2 + nbytes;
+ }
+ }
+
+ /*append or copy the data to be written to the aligned buffer.*/
+ p1 = (unsigned char*)copy_buf + addr % _fbsize;
+ memcpy(p1, buf, size);
+
+ /*look for the aligned position for writing the data*/
+ if(file_seek(file->fd, (file_offset_t)(addr - addr % _fbsize), SEEK_SET) < 0)
+ HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
+
+ /*
+ * Write the data, being careful of interrupted system calls and partial write.
+ * It doesn't truncate the extra data introduced by alignment because that step
+ * is done in H5FD_direct_flush.
+ */
+ p2 = copy_buf;
+ while (alloc_size>0) {
+ do {
+ nbytes = HDwrite(file->fd, p2, alloc_size);
+ } while (-1==nbytes && EINTR==errno);
+
+ if (-1==nbytes) { /* error */
+ HSYS_GOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed")
+ }
+ assert(nbytes>0);
+ assert((size_t)nbytes<=alloc_size);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
+ H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
+ alloc_size -= (size_t)nbytes;
+ p2 = (unsigned char*)p2 + nbytes;
+ }
+
+ /*Update the address and size*/
+ addr += (haddr_t)size;
+ buf = (const char*)buf + size;
+
+ HDfree(copy_buf);
}
- /*Update the address and size*/
- addr += (haddr_t)size;
- buf = (const char*)buf + size;
-
/* Update current position and eof */
file->pos = addr;
file->op = OP_WRITE;
if (file->pos>file->eof)
file->eof = file->pos;
- if(((addr % FBSIZE != 0) || (size % FBSIZE != 0)) && copy_buf)
- HDfree(copy_buf);
-
done:
if(ret_value<0) {
/* Reset last file I/O information */
diff --git a/src/H5FDdirect.h b/src/H5FDdirect.h
index 25ff3de..4e4d821 100644
--- a/src/H5FDdirect.h
+++ b/src/H5FDdirect.h
@@ -36,7 +36,8 @@ extern "C" {
H5_DLL hid_t H5FD_direct_init(void);
H5_DLL void H5FD_direct_term(void);
-H5_DLL herr_t H5Pset_fapl_direct(hid_t fapl_id);
+H5_DLL herr_t H5Pset_fapl_direct(hid_t fapl_id, hsize_t alignment, hsize_t block_size,
+ hsize_t cbuf_size);
#ifdef __cplusplus
}