int mca_common_ompio_file_read (ompio_file_t *fh,
void *buf,
int count,
struct ompi_datatype_t *datatype,
ompi_status_public_t *status)
{
int ret = OMPI_SUCCESS;
size_t total_bytes_read = 0; /* total bytes that have been read*/
size_t bytes_per_cycle = 0; /* total read in each cycle by each process*/
int index = 0;
int cycles = 0;
uint32_t iov_count = 0;
struct iovec *decoded_iov = NULL;
size_t max_data=0, real_bytes_read=0;
size_t spc=0;
ssize_t ret_code=0;
int i = 0; /* index into the decoded iovec of the buffer */
int j = 0; /* index into the file vie iovec */
if (fh->f_amode & MPI_MODE_WRONLY){
// opal_output(10, "Improper use of FILE Mode, Using WRONLY for Read!\n");
ret = MPI_ERR_ACCESS;
return ret;
}
if ( 0 == count ) {
if ( MPI_STATUS_IGNORE != status ) {
status->_ucount = 0;
}
return ret;
}
#if OPAL_CUDA_SUPPORT
int is_gpu, is_managed;
opal_convertor_t convertor;
mca_common_ompio_check_gpu_buf ( fh, buf, &is_gpu, &is_managed);
if ( is_gpu && !is_managed ) {
char *tbuf=NULL;
OMPIO_CUDA_PREPARE_BUF(fh,buf,count,datatype,tbuf,&convertor,max_data,decoded_iov,iov_count);
}
else {
mca_common_ompio_decode_datatype (fh,
datatype,
count,
buf,
&max_data,
&decoded_iov,
&iov_count);
}
#else
mca_common_ompio_decode_datatype (fh,
datatype,
count,
buf,
&max_data,
&decoded_iov,
&iov_count);
#endif
if ( 0 < max_data && 0 == fh->f_iov_count ) {
if ( MPI_STATUS_IGNORE != status ) {
status->_ucount = 0;
}
return OMPI_SUCCESS;
}
if ( -1 == OMPIO_MCA_GET(fh, cycle_buffer_size )) {
bytes_per_cycle = max_data;
}
else {
bytes_per_cycle = OMPIO_MCA_GET(fh, cycle_buffer_size);
}
cycles = ceil((double)max_data/bytes_per_cycle);
#if 0
printf ("Bytes per Cycle: %d Cycles: %d max_data:%d \n",bytes_per_cycle, cycles, max_data);
#endif
j = fh->f_index_in_file_view;
for (index = 0; index < cycles; index++) {
mca_common_ompio_build_io_array ( fh,
index,
cycles,
bytes_per_cycle,
max_data,
iov_count,
decoded_iov,
&i,
&j,
&total_bytes_read,
&spc,
&fh->f_io_array,
&fh->f_num_of_io_entries);
if (fh->f_num_of_io_entries) {
ret_code = fh->f_fbtl->fbtl_preadv (fh);
if ( 0<= ret_code ) {
real_bytes_read+=(size_t)ret_code;
}
}
fh->f_num_of_io_entries = 0;
if (NULL != fh->f_io_array) {
free (fh->f_io_array);
fh->f_io_array = NULL;
}
}
#if OPAL_CUDA_SUPPORT
if ( is_gpu && !is_managed ) {
size_t pos=0;
opal_convertor_unpack (&convertor, decoded_iov, &iov_count, &pos );
opal_convertor_cleanup (&convertor);
mca_common_ompio_release_buf (fh, decoded_iov->iov_base);
}
#endif
if (NULL != decoded_iov) {
free (decoded_iov);
decoded_iov = NULL;
}
if ( MPI_STATUS_IGNORE != status ) {
status->_ucount = real_bytes_read;
}
return ret;
}
int mca_common_ompio_file_write (ompio_file_t *fh,
const void *buf,
int count,
struct ompi_datatype_t *datatype,
ompi_status_public_t *status)
{
int ret = OMPI_SUCCESS;
int index = 0;
int cycles = 0;
uint32_t iov_count = 0;
struct iovec *decoded_iov = NULL;
size_t bytes_per_cycle=0;
size_t total_bytes_written = 0;
size_t max_data=0, real_bytes_written=0;
ssize_t ret_code=0;
size_t spc=0;
int i = 0; /* index into the decoded iovec of the buffer */
int j = 0; /* index into the file view iovec */
if ( 0 == count ) {
if ( MPI_STATUS_IGNORE != status ) {
status->_ucount = 0;
}
return ret;
}
mca_common_ompio_decode_datatype (fh,
datatype,
count,
buf,
&max_data,
&decoded_iov,
&iov_count);
if ( -1 == OMPIO_MCA_GET(fh, cycle_buffer_size) ) {
bytes_per_cycle = max_data;
}
else {
bytes_per_cycle = OMPIO_MCA_GET(fh, cycle_buffer_size);
}
cycles = ceil((float)max_data/bytes_per_cycle);
#if 0
printf ("Bytes per Cycle: %d Cycles: %d\n", bytes_per_cycle, cycles);
#endif
j = fh->f_index_in_file_view;
for (index = 0; index < cycles; index++) {
mca_common_ompio_build_io_array ( fh,
index,
cycles,
bytes_per_cycle,
max_data,
iov_count,
decoded_iov,
&i,
&j,
&total_bytes_written,
&spc);
if (fh->f_num_of_io_entries) {
ret_code =fh->f_fbtl->fbtl_pwritev (fh);
if ( 0<= ret_code ) {
real_bytes_written+= (size_t)ret_code;
}
}
fh->f_num_of_io_entries = 0;
if (NULL != fh->f_io_array) {
free (fh->f_io_array);
fh->f_io_array = NULL;
}
}
if (NULL != decoded_iov) {
free (decoded_iov);
decoded_iov = NULL;
}
if ( MPI_STATUS_IGNORE != status ) {
status->_ucount = real_bytes_written;
}
return ret;
}