ad_pvfs_write.c

MPICH是MPI的重要研究,提供了一系列的接口函数,为并行计算的实现提供了编程环境.

	   if possible */

	while (size_wrote < bufsize) {
	    k = start_k;
	    new_buffer_write = 0;
	    mem_list_count = 0;
	    while ((mem_list_count < MAX_ARRAY_SIZE) && 
		   (new_buffer_write < bufsize-size_wrote)) {
	        /* find mem_list_count and file_list_count such that both are
		   less than MAX_ARRAY_SIZE, the sum of their lengths are
		   equal, and the sum of all the data read and data to be
		   read in the next immediate read list is less than
		   bufsize */
	        if(mem_list_count) {
		    if((new_buffer_write + flat_buf->blocklens[k] + 
			size_wrote) > bufsize) {
		        end_bwr_size = new_buffer_write + 
			    flat_buf->blocklens[k] - (bufsize - size_wrote);
			new_buffer_write = bufsize - size_wrote;
		    }
		    else {
		        new_buffer_write += flat_buf->blocklens[k];
			end_bwr_size = flat_buf->blocklens[k];
		    }
		}
		else {
		    if (bwr_size > (bufsize - size_wrote)) {
		        new_buffer_write = bufsize - size_wrote;
			bwr_size = new_buffer_write;
		    }
		    else new_buffer_write = bwr_size;
		}
		mem_list_count++;
		k = (k + 1)%flat_buf->count;
	     } /* while ((mem_list_count < MAX_ARRAY_SIZE) && 
	       (new_buffer_write < bufsize-size_wrote)) */
	    j = start_j;
	    new_file_write = 0;
	    file_list_count = 0;
	    while ((file_list_count < MAX_ARRAY_SIZE) && 
		   (new_file_write < new_buffer_write)) {
	        if(file_list_count) {
		    if((new_file_write + flat_file->blocklens[j]) > 
		       new_buffer_write) {
		        end_fwr_size = new_buffer_write - new_file_write;
			new_file_write = new_buffer_write;
			j--;
		    }
		    else {
		        new_file_write += flat_file->blocklens[j];
			end_fwr_size = flat_file->blocklens[j];
		    }
		}
		else {
		    if (fwr_size > new_buffer_write) {
		        new_file_write = new_buffer_write;
			fwr_size = new_file_write;
		    }
		    else new_file_write = fwr_size;
		}
		file_list_count++;
		if (j < (flat_file->count - 1)) j++;
		else j = 0;
		
		k = start_k;
		if ((new_file_write < new_buffer_write) && 
		    (file_list_count == MAX_ARRAY_SIZE)) {
		    new_buffer_write = 0;
		    mem_list_count = 0;
		    while (new_buffer_write < new_file_write) {
		        if(mem_list_count) {
			    if((new_buffer_write + flat_buf->blocklens[k]) >
			       new_file_write) {
			        end_bwr_size = new_file_write - 
				    new_buffer_write;
				new_buffer_write = new_file_write;
				k--;
			    }
			    else {
			        new_buffer_write += flat_buf->blocklens[k];
				end_bwr_size = flat_buf->blocklens[k];
			    }
			}
			else {
			    new_buffer_write = bwr_size;
			    if (bwr_size > (bufsize - size_wrote)) {
			        new_buffer_write = bufsize - size_wrote;
				bwr_size = new_buffer_write;
			    }
			}
			mem_list_count++;
			k = (k + 1)%flat_buf->count;
		    } /* while (new_buffer_write < new_file_write) */
		} /* if ((new_file_write < new_buffer_write) &&
		     (file_list_count == MAX_ARRAY_SIZE)) */
	    } /* while ((mem_list_count < MAX_ARRAY_SIZE) && 
		 (new_buffer_write < bufsize-size_wrote)) */

	    /*  fakes filling the writelist arrays of lengths found above  */
	    k = start_k;
	    j = start_j;
	    for (i=0; i<mem_list_count; i++) {	     
		if(i) {
		    if (i == (mem_list_count - 1)) {
			if (flat_buf->blocklens[k] == end_bwr_size)
			    bwr_size = flat_buf->blocklens[(k+1)%
							  flat_buf->count];
			else {
			    bwr_size = flat_buf->blocklens[k] - end_bwr_size;
			    k--;
			    buf_count--;
			}
		    }
		}
		buf_count++;
		k = (k + 1)%flat_buf->count;
	    } /* for (i=0; i<mem_list_count; i++) */
	    for (i=0; i<file_list_count; i++) {
		if (i) {
		    if (i == (file_list_count - 1)) {
			if (flat_file->blocklens[j] == end_fwr_size)
			    fwr_size = flat_file->blocklens[(j+1)%
							  flat_file->count];   
			else {
			    fwr_size = flat_file->blocklens[j] - end_fwr_size;
			    j--;
			}
		    }
		}
		if (j < flat_file->count - 1) j++;
		else {
		    j = 0;
		    n_filetypes++;
		}
	    } /* for (i=0; i<file_list_count; i++) */
	    size_wrote += new_buffer_write;
	    start_k = k;
	    start_j = j;
	    if (max_mem_list < mem_list_count)
	        max_mem_list = mem_list_count;
	    if (max_file_list < file_list_count)
	        max_file_list = file_list_count;
	    if (max_mem_list == max_mem_list == MAX_ARRAY_SIZE)
	        break;
	} /* while (size_wrote < bufsize) */

	mem_offsets = (char **)ADIOI_Malloc(max_mem_list*sizeof(char *));
	mem_lengths = (int *)ADIOI_Malloc(max_mem_list*sizeof(int));
	file_offsets = (int64_t *)ADIOI_Malloc(max_file_list*sizeof(int64_t));
	file_lengths = (int32_t *)ADIOI_Malloc(max_file_list*sizeof(int32_t));
	    
	size_wrote = 0;
	n_filetypes = st_n_filetypes;
	fwr_size = st_fwr_size;
	bwr_size = flat_buf->blocklens[0];
	buf_count = 0;
	start_mem_offset = 0;
	start_k = k = 0;
	start_j = st_index;

	/*  this section calculates mem_list_count and file_list_count
	    and also finds the possibly odd sized last array elements
	    in new_fwr_size and new_bwr_size  */
	
	while (size_wrote < bufsize) {
	    k = start_k;
	    new_buffer_write = 0;
	    mem_list_count = 0;
	    while ((mem_list_count < MAX_ARRAY_SIZE) && 
		   (new_buffer_write < bufsize-size_wrote)) {
	        /* find mem_list_count and file_list_count such that both are
		   less than MAX_ARRAY_SIZE, the sum of their lengths are
		   equal, and the sum of all the data read and data to be
		   read in the next immediate read list is less than
		   bufsize */
	        if(mem_list_count) {
		    if((new_buffer_write + flat_buf->blocklens[k] + 
			size_wrote) > bufsize) {
		        end_bwr_size = new_buffer_write + 
			    flat_buf->blocklens[k] - (bufsize - size_wrote);
			new_buffer_write = bufsize - size_wrote;
		    }
		    else {
		        new_buffer_write += flat_buf->blocklens[k];
			end_bwr_size = flat_buf->blocklens[k];
		    }
		}
		else {
		    if (bwr_size > (bufsize - size_wrote)) {
		        new_buffer_write = bufsize - size_wrote;
			bwr_size = new_buffer_write;
		    }
		    else new_buffer_write = bwr_size;
		}
		mem_list_count++;
		k = (k + 1)%flat_buf->count;
	     } /* while ((mem_list_count < MAX_ARRAY_SIZE) && 
	       (new_buffer_write < bufsize-size_wrote)) */
	    j = start_j;
	    new_file_write = 0;
	    file_list_count = 0;
	    while ((file_list_count < MAX_ARRAY_SIZE) && 
		   (new_file_write < new_buffer_write)) {
	        if(file_list_count) {
		    if((new_file_write + flat_file->blocklens[j]) > 
		       new_buffer_write) {
		        end_fwr_size = new_buffer_write - new_file_write;
			new_file_write = new_buffer_write;
			j--;
		    }
		    else {
		        new_file_write += flat_file->blocklens[j];
			end_fwr_size = flat_file->blocklens[j];
		    }
		}
		else {
		    if (fwr_size > new_buffer_write) {
		        new_file_write = new_buffer_write;
			fwr_size = new_file_write;
		    }
		    else new_file_write = fwr_size;
		}
		file_list_count++;
		if (j < (flat_file->count - 1)) j++;
		else j = 0;
		
		k = start_k;
		if ((new_file_write < new_buffer_write) && 
		    (file_list_count == MAX_ARRAY_SIZE)) {
		    new_buffer_write = 0;
		    mem_list_count = 0;
		    while (new_buffer_write < new_file_write) {
		        if(mem_list_count) {
			    if((new_buffer_write + flat_buf->blocklens[k]) >
			       new_file_write) {
			        end_bwr_size = new_file_write -
				  new_buffer_write;
				new_buffer_write = new_file_write;
				k--;
			    }
			    else {
			        new_buffer_write += flat_buf->blocklens[k];
				end_bwr_size = flat_buf->blocklens[k];
			    }
			}
			else {
			    new_buffer_write = bwr_size;
			    if (bwr_size > (bufsize - size_wrote)) {
			        new_buffer_write = bufsize - size_wrote;
				bwr_size = new_buffer_write;
			    }
			}
			mem_list_count++;
			k = (k + 1)%flat_buf->count;
		    } /* while (new_buffer_write < new_file_write) */
		} /* if ((new_file_write < new_buffer_write) &&
		     (file_list_count == MAX_ARRAY_SIZE)) */
	    } /* while ((mem_list_count < MAX_ARRAY_SIZE) && 
		 (new_buffer_write < bufsize-size_wrote)) */

	    /*  fills the allocated readlist arrays  */
	    k = start_k;
	    j = start_j;
	    for (i=0; i<mem_list_count; i++) {	     
	        mem_offsets[i] = ((char*)buf + buftype_extent*
					 (buf_count/flat_buf->count) +
					 (int)flat_buf->indices[k]);
		
		if(!i) {
		    mem_lengths[0] = bwr_size;
		    mem_offsets[0] += flat_buf->blocklens[k] - bwr_size;
		}
		else {
		    if (i == (mem_list_count - 1)) {
		        mem_lengths[i] = end_bwr_size;
			if (flat_buf->blocklens[k] == end_bwr_size)
			    bwr_size = flat_buf->blocklens[(k+1)%
							  flat_buf->count];
			else {
			    bwr_size = flat_buf->blocklens[k] - end_bwr_size;
			    k--;
			    buf_count--;
			}
		    }
		    else {
		        mem_lengths[i] = flat_buf->blocklens[k];
		    }
		}
		buf_count++;
		k = (k + 1)%flat_buf->count;
	    } /* for (i=0; i<mem_list_count; i++) */
	    for (i=0; i<file_list_count; i++) {
	        file_offsets[i] = disp + flat_file->indices[j] + n_filetypes *
		    filetype_extent;
	        if (!i) {
		    file_lengths[0] = fwr_size;
		    file_offsets[0] += flat_file->blocklens[j] - fwr_size;
		}
		else {
		    if (i == (file_list_count - 1)) {
		        file_lengths[i] = end_fwr_size;
			if (flat_file->blocklens[j] == end_fwr_size)
			    fwr_size = flat_file->blocklens[(j+1)%
							  flat_file->count];   
			else {
			    fwr_size = flat_file->blocklens[j] - end_fwr_size;
			    j--;
			}
		    }
		    else file_lengths[i] = flat_file->blocklens[j];
		}
		if (j < flat_file->count - 1) j++;
		else {
		    j = 0;
		    n_filetypes++;
		}
	    } /* for (i=0; i<file_list_count; i++) */
	    pvfs_write_list(fd->fd_sys,mem_list_count, mem_offsets,
			   mem_lengths, file_list_count, file_offsets,
			   file_lengths);
	    size_wrote += new_buffer_write;
	    start_k = k;
	    start_j = j;
	} /* while (size_wrote < bufsize) */
	ADIOI_Free(mem_offsets);
	ADIOI_Free(mem_lengths);
    }
    ADIOI_Free(file_offsets);
    ADIOI_Free(file_lengths);

    if (file_ptr_type == ADIO_INDIVIDUAL) fd->fp_ind = off;
#ifdef PRINT_ERR_MSG
    *error_code = (err_flag) ? MPI_ERR_UNKNOWN : MPI_SUCCESS;
#else
    if (err_flag) {
        *error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ADIO_ERROR,
				      myname, "I/O Error", "%s",
				      strerror(errno));
	ADIOI_Error(fd, *error_code, myname);
    }
    else *error_code = MPI_SUCCESS;
#endif

    fd->fp_sys_posn = -1;   /* set it to null. */

#ifdef HAVE_STATUS_SET_BYTES
    MPIR_Status_set_bytes(status, datatype, bufsize);
/* This is a temporary way of filling in status. The right way is to 
   keep track of how much data was actually written by ADIOI_BUFFERED_WRITE. */
#endif

    if (!buftype_is_contig) ADIOI_Delete_flattened(datatype);
}
#endif /* HAVE_PVFS_LISTIO */