/*****************************************************************************
* *
* Copyright (c) 2003-2006 Intel Corporation. *
* All rights reserved. *
* *
*****************************************************************************
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***************************************************************************
For more documentation than found here, see
[1] doc/ReadMe_IMB.txt
[2] Intel (R) MPI Benchmarks
Users Guide and Methodology Description
In
doc/IMB_ug.pdf
File: IMB_init_file.c
Implemented functions:
IMB_init_file_content;
IMB_init_file;
IMB_free_file;
IMB_del_file;
IMB_open_file;
***************************************************************************/
#include "IMB_declare.h"
#include "IMB_benchmark.h"
#include "IMB_prototypes.h"
void IMB_init_file_content(void* BUF, int pos1, int pos2)
/*
Initializes contents of a file for READ benchmarks
Input variables:
-pos1 (type int)
-pos2 (type int)
pos1, pos2: target positions (start/end) in file
In/out variables:
-BUF (type void*)
Content of buffer to be written to file between these positions
*/
{
IMB_ass_buf( BUF, 0, pos1, pos2, 1);
}
int IMB_init_file(struct comm_info* c_info, struct Bench* Bmark, int NP)
/*
Input variables:
-Bmark (type struct Bench*)
(For explanation of struct Bench type:
describes all aspects of modes of a benchmark;
see [1] for more information)
Given file i/o benchmark
-NP (type int)
Number of active processes
In/out variables:
-c_info (type struct comm_info*)
Collection of all base data for MPI;
see [1] for more information
MPI_File component is set accordingly
Return value (type int)
Error code (identical with MPI error code if occurs)
*/
{
int error = 0;
int fnlen;
IMB_free_file(c_info);
c_info->fh = MPI_FILE_NULL;
c_info->etype = MPI_BYTE;
MPI_Type_size(c_info->etype,&c_info->e_size);
c_info->filetype = c_info->etype;
IMB_user_set_info(&c_info->info);
c_info-> disp = (MPI_Offset)0;
c_info->datarep = IMB_str("native");
if( Bmark->RUN_MODES[0].type == SingleTransfer )
c_info->all_io_procs = 1;
else
c_info->all_io_procs = c_info->num_procs;
fnlen = 1+strlen(FILENAME);
/* July 2002 fix V2.2.1: group_mode >= 0 */
if( c_info->group_mode >= 0 )
fnlen += 4;
if( Bmark->fpointer == private )
{
if( c_info->rank > c_info->all_io_procs-1 || c_info->rank < 0 )
{
c_info->File_comm = MPI_COMM_NULL;
c_info->File_rank = -1;
c_info->File_num_procs = 0;
}
else
{
c_info->File_comm = MPI_COMM_SELF;
c_info->File_rank = 0;
c_info->File_num_procs = 1;
}
if( c_info->File_rank >= 0 )
{
fnlen += 4;
c_info->filename = (char*) IMB_v_alloc(sizeof(char)*fnlen,"Init_File");
/* July 2002 fix V2.2.1: group_mode >= 0 */
if( c_info->group_mode >= 0 )
sprintf(c_info->filename,"%s_g%d_%d",FILENAME,c_info->group_no,c_info->w_rank);
else
sprintf(c_info->filename,"%s_%d",FILENAME,c_info->w_rank);
c_info->amode = MPI_MODE_CREATE | MPI_MODE_RDWR | MPI_MODE_UNIQUE_OPEN;
}
}
else
{
if( c_info->communicator == MPI_COMM_NULL )
{
c_info->File_comm = MPI_COMM_NULL;
c_info->File_rank = -1;
c_info->File_num_procs = 0;
}
else
{
c_info->File_comm = c_info->communicator;
c_info->File_rank = c_info->rank;
c_info->File_num_procs = c_info->num_procs;
}
c_info->filename = (char*) IMB_v_alloc(sizeof(char)*fnlen,"Init_File");
/* July 2002 fix V2.2.1: group_mode >= 0 */
if( c_info->group_mode >= 0 )
sprintf(c_info->filename,"%s_g%d",FILENAME,c_info->group_no);
else
sprintf(c_info->filename,"%s",FILENAME);
c_info->amode = MPI_MODE_CREATE | MPI_MODE_RDWR;
}
if( Bmark->access == no ) return 0;
if( c_info -> File_rank == 0 )
{
int ierr, size, total;
MPI_Status stat;
IMB_del_file(c_info);
size=1<<MAXMSGLOG;
total = max(size,OVERALL_VOL);
if( OVERALL_VOL/size > MSGSPERSAMPLE )
total = size*MSGSPERSAMPLE;
/* July 2002 fix V2.2.1: calculation of file sizes in "priv" case */
if ( Bmark->fpointer == private )
{
int NP= c_info->all_io_procs;
total = (total+NP-1)/NP;
if ( size%NP ) total += asize*MSGSPERSAMPLE;
}
/* July 2002 end fix */
ierr = MPI_File_open(MPI_COMM_SELF, c_info->filename,
c_info->amode, c_info->info, &c_info->fh);
IMB_err_hand(1,ierr);
MPI_File_set_view(c_info->fh,(MPI_Offset)0,
c_info->etype,c_info->etype,c_info->datarep,c_info->info);
/* July 2002 fix V2.2.1: size <-> total */
ierr = MPI_File_set_size(c_info->fh, total);
IMB_err_hand(1,ierr);
if( Bmark->access == get )
{
/* Prepare File for input */
int el_size = 1<<20;
int pos1, pos2;
pos1 = 0;
while( pos1 < total )
{
pos2 = min(total-1,pos1+el_size-1);
size = ((pos2-pos1)/asize+1)*asize;
IMB_alloc_buf(c_info, "Init_File 1 ",size, 0);
IMB_init_file_content(c_info->s_buffer, pos1, pos2);
ierr=MPI_File_write(c_info->fh,c_info->s_buffer,pos2-pos1+1,c_info->etype,&stat);
IMB_err_hand(1,ierr);
pos1 = pos2+1;
}
IMB_del_s_buf(c_info);
}
ierr= MPI_File_close(&c_info->fh);
IMB_err_hand(1,ierr);
}
return error;
}
void IMB_free_file(struct comm_info * c_info)
/*
In/out variables:
-c_info (type struct comm_info *)
Collection of all base data for MPI;
see [1] for more information
File related components are free-d and reset to
NULL initialization
*/
{
if( c_info->filename != (char*)NULL ) free(c_info->filename);
if( c_info->datarep != (char*)NULL ) free(c_info->datarep );
if( c_info->filename != (char*)NULL )
if( c_info->view != MPI_DATATYPE_NULL )
MPI_Type_free(&c_info->view);
if( c_info->info != MPI_INFO_NULL )
MPI_Info_free(&c_info->info);
if( c_info->fh != MPI_FILE_NULL )
MPI_File_close(& c_info->fh );
c_info->filename = (char*)NULL;
c_info->datarep = (char*)NULL;
c_info->view = MPI_DATATYPE_NULL;
c_info->info = MPI_INFO_NULL;
c_info->fh = MPI_FILE_NULL;
}
void IMB_del_file(struct comm_info* c_info)
/*
In/out variables:
-c_info (type struct comm_info*)
Collection of all base data for MPI;
see [1] for more information
File associated to MPI_File component is erased from disk
*/
{
if( c_info-> fh != MPI_FILE_NULL ) MPI_File_close(&c_info->fh);
if( c_info->filename != (char*)NULL )
{
if( c_info->File_rank == 0 )
{
int ierr;
/* IMB_3.0: simplify file deletion */
ierr=MPI_File_delete(c_info->filename,MPI_INFO_NULL);
}
}
}
int IMB_open_file(struct comm_info* c_info)
/*
In/out variables:
-c_info (type struct comm_info*)
Collection of all base data for MPI;
see [1] for more information
File associated to MPI_File component is opened, view is set
Return value (type int)
Error code (identical with MPI error code if occurs)
*/
{
int ierr;
ierr = 0;
if ( c_info->File_comm != MPI_COMM_NULL )
{
ierr = MPI_File_open(c_info->File_comm, c_info->filename,
c_info->amode, c_info->info, &c_info->fh);
MPI_ERRHAND(ierr);
ierr = MPI_File_set_view(c_info->fh, c_info->disp, c_info->etype,
c_info->filetype, c_info->datarep, c_info->info);
MPI_ERRHAND(ierr);
}
return ierr;
}
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