458 строки
15 KiB
C
458 строки
15 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif /* HAVE_FCNTL_H */
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#ifdef HAVE_TIME_H
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#include <time.h>
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#endif /* HAVE_TIME_H */
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif /* HAVE_SYS_STAT_H */
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include "ompi/constants.h"
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#include "ompi/proc/proc.h"
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#include "common_sm_mmap.h"
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#include "opal/util/basename.h"
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#include "opal/util/output.h"
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#include "orte/util/sys_info.h"
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#include "orte/util/proc_info.h"
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#include "orte/mca/rml/rml_types.h"
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#include "orte/mca/rml/base/base.h"
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OBJ_CLASS_INSTANCE(
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mca_common_sm_mmap_t,
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opal_object_t,
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NULL,
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NULL
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);
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/*
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* Instance that is shared between components that use shared memory
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*/
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mca_common_sm_mmap_t *mca_common_sm_mmap = NULL;
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mca_common_sm_mmap_t* mca_common_sm_mmap_init(size_t size, char *file_name,
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size_t size_ctl_structure, size_t data_seg_alignment)
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{
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#if !defined(__WINDOWS__)
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int fd = -1;
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mca_common_sm_file_header_t* seg = NULL;
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mca_common_sm_mmap_t* map = NULL;
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unsigned char *addr = NULL;
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size_t tmp,mem_offset;
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bool i_create_shared_file=false;
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ompi_proc_t **procs;
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size_t n_local_procs=0, n_total_procs=0,n,p;
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ompi_proc_t *my_proc;
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int rc=0, sm_file_inited=0;
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struct iovec iov[2];
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int sm_file_created;
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/* figure out how many local procs are on this host */
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procs=ompi_proc_world(&n_total_procs);
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for(p=0 ; p < n_total_procs ; p++ ) {
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if( procs[p]->proc_flags & OMPI_PROC_FLAG_LOCAL){
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n_local_procs++;
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}
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}
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/* create list of local proc_t pointers - compress the original
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list */
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n=0;
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for(p=0; p < n_total_procs ; p++ ) {
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if( procs[p]->proc_flags & OMPI_PROC_FLAG_LOCAL) {
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procs[n]=procs[p];
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n++;
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}
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}
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/* figure out if I am the lowest rank on host, who will create
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the shared file */
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my_proc=ompi_proc_local();
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if( my_proc == procs[0] ) {
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i_create_shared_file=true;
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}
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/* open the backing file. */
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if( i_create_shared_file ) {
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/* process initializing the file */
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fd = open(file_name, O_CREAT|O_RDWR, 0600);
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if (fd < 0) {
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opal_output(0,"mca_common_sm_mmap_init: open %s failed with errno=%d\n",
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file_name, errno);
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goto file_opened;
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}
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/* truncate the file to the requested size */
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if(ftruncate(fd, size) != 0) {
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opal_output(0,
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"mca_common_sm_mmap_init: ftruncate failed with errno=%d\n",
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errno);
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goto file_opened;
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}
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/* map the file and initialize segment state */
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seg = (mca_common_sm_file_header_t*)
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mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if( (void*)-1 == seg ) {
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opal_output(0, "mca_common_sm_mmap_init: mmap failed with errno=%d\n",
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errno);
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goto file_opened;
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}
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/* set up the map object */
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map = OBJ_NEW(mca_common_sm_mmap_t);
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strncpy(map->map_path, file_name, OMPI_PATH_MAX);
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/* the first entry in the file is the control structure. The first
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entry in the control structure is an mca_common_sm_file_header_t
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element */
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map->map_seg = seg;
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/* If we have a data segment (i.e., if 0 != data_seg_alignment),
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then make it the first aligned address after the control
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structure. */
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if (0 != data_seg_alignment) {
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addr = ((unsigned char *) seg) + size_ctl_structure;
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/* calculate how far off alignment we are */
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tmp = ((size_t) addr) % data_seg_alignment;
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/* if we're off alignment, then move up to the next alignment */
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if( tmp > 0 )
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addr += (data_seg_alignment - tmp);
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/* is addr past end of file ? */
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if( (unsigned char*)seg+size < addr ) {
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opal_output(0, "mca_common_sm_mmap_init: memory region too small len %lu addr %p\n",
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(unsigned long)size, addr);
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goto file_opened;
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}
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map->data_addr = addr;
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} else {
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map->data_addr = NULL;
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}
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mem_offset = addr-(unsigned char *)seg;
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map->map_addr = (unsigned char *)seg;
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map->map_size = size;
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/* initialize the segment - only the first process to open the file */
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seg->seg_offset = mem_offset;
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seg->seg_size = size;
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opal_atomic_unlock(&seg->seg_lock);
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seg->seg_inited = false;
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/* if we got this far, the file has been initialized correctly */
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sm_file_inited=1;
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file_opened:
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/* signal the rest of the local procs that the backing file
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has been created */
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for(p=1 ; p < n_local_procs ; p++ ) {
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sm_file_created=ORTE_RML_TAG_SM_BACK_FILE_CREATED;
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iov[0].iov_base=&sm_file_created;
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iov[0].iov_len=sizeof(sm_file_created);
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iov[1].iov_base=&sm_file_inited;
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iov[1].iov_len=sizeof(sm_file_inited);
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rc=orte_rml.send(&(procs[p]->proc_name),iov,2,
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ORTE_RML_TAG_SM_BACK_FILE_CREATED,0);
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if( rc < 0 ) {
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opal_output(0,
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"mca_common_sm_mmap_init: orte_rml.send failed to %lu with errno=%d\n",
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(unsigned long)p, errno);
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goto return_error;
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}
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}
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if ( 0 == sm_file_inited ) {
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/* error - the sm backing file did not get opened correctly */
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goto return_error;
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}
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} else {
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/* all other procs wait for the file to be initialized
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before using the backing file */
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iov[0].iov_base=&sm_file_created;
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iov[0].iov_len=sizeof(sm_file_created);
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iov[1].iov_base=&sm_file_inited;
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iov[1].iov_len=sizeof(sm_file_inited);
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rc=orte_rml.recv(&(procs[0]->proc_name),iov,2,
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ORTE_RML_TAG_SM_BACK_FILE_CREATED,0);
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if( rc < 0 ) {
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opal_output(0, "mca_common_sm_mmap_init: orte_rml.recv failed from %ld with errno=%d\n",
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0L, errno);
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goto return_error;
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}
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/* check to see if file inited correctly */
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if( 0 == sm_file_inited ) {
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goto return_error;
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}
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/* open backing file */
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fd = open(file_name, O_RDWR, 0600);
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if (fd < 0) {
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opal_output(0,"mca_common_sm_mmap_init: open %s failed with errno=%d\n",
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file_name, errno);
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return NULL;
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}
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/* map the file and initialize segment state */
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seg = (mca_common_sm_file_header_t*)
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mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if( (void*)-1 == seg ) {
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opal_output(0, "mca_common_sm_mmap_init: mmap failed with errno=%d\n",
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errno);
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goto return_error;
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}
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/* set up the map object */
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map = OBJ_NEW(mca_common_sm_mmap_t);
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strncpy(map->map_path, file_name, OMPI_PATH_MAX);
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/* the first entry in the file is the control structure. The first
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entry in the control structure is an mca_common_sm_file_header_t
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element */
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map->map_seg = seg;
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/* If we have a data segment (i.e., if 0 != data_seg_alignment),
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then make it the first aligned address after the control
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structure. */
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if (0 != data_seg_alignment) {
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addr = ((unsigned char *) seg) + size_ctl_structure;
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/* calculate how far off alignment we are */
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tmp = ((size_t) addr) % data_seg_alignment;
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/* if we're off alignment, then move up to the next alignment */
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if( tmp > 0 )
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addr += (data_seg_alignment - tmp);
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/* is addr past end of file ? */
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if( (unsigned char*)seg+size < addr ) {
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opal_output(0, "mca_common_sm_mmap_init: memory region too small len %lu addr %p\n",
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(unsigned long)size,addr);
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goto return_error;
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}
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map->data_addr = addr;
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} else {
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map->data_addr = NULL;
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}
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mem_offset = addr-(unsigned char *)seg;
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map->map_addr = (unsigned char *)seg;
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map->map_size = size;
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}
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/* enable access by other processes on this host */
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close(fd);
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return map;
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return_error:
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if( -1 != fd ) {
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close(fd);
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}
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if( NULL != seg ) munmap((void*) seg,size);
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return NULL;
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#else
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int fd = -1, return_code = OMPI_SUCCESS;
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bool file_previously_opened = false;
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mca_common_sm_file_header_t* seg = NULL;
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mca_common_sm_mmap_t* map = NULL;
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unsigned char *addr = NULL;
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size_t tmp,mem_offset;
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HANDLE hMapObject = INVALID_HANDLE_VALUE;
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LPVOID lpvMem = NULL;
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char *temp1, *temp2;
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int rc;
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/**
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* On Windows the shared file will be created by the OS directly on
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* the system ressources. Therefore, no file get involved in the
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* operation. However, a unique key should be used as name for the
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* shared memory object in order to allow all processes to access
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* the same unique shared memory region. The key will be obtained
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* from the original file_name by replacing all path separator
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* occurences by '/' (as '\' is not allowed on the object name).
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*/
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temp1 = strdup(file_name);
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temp2 = temp1;
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while( NULL != (temp2 = strchr(temp2, OPAL_PATH_SEP[0])) ) {
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*temp2 = '/';
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}
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hMapObject = CreateFileMapping( INVALID_HANDLE_VALUE, /* use paging file */
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NULL, /* no security attributes */
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PAGE_READWRITE, /* read/write access */
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0, /* size: high 32-bits */
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(DWORD)size, /* size: low 32-bits */
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temp1); /* name of map object */
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if( NULL == hMapObject ) {
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rc = GetLastError();
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goto return_error;
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}
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if( ERROR_ALREADY_EXISTS == GetLastError() )
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file_previously_opened=true;
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free(temp1); /* relase the temporary file name */
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/* Get a pointer to the file-mapped shared memory. */
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lpvMem = MapViewOfFile( hMapObject, /* object to map view of */
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FILE_MAP_WRITE, /* read/write access */
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0, /* high offset: map from */
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0, /* low offset: beginning */
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0); /* default: map entire file */
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if( NULL == lpvMem ) {
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rc = GetLastError();
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goto return_error;
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}
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seg = (mca_common_sm_file_header_t*)lpvMem;
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/* set up the map object */
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map = OBJ_NEW(mca_common_sm_mmap_t);
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strncpy(map->map_path, file_name, OMPI_PATH_MAX);
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/* the first entry in the file is the control structure. The first
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entry in the control structure is an mca_common_sm_file_header_t
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element */
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map->map_seg = seg;
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/* If we have a data segment (i.e., if 0 != data_seg_alignment),
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then make it the first aligned address after the control
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structure. */
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if (0 != data_seg_alignment) {
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addr = ((unsigned char *) seg) + size_ctl_structure;
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/* calculate how far off alignment we are */
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tmp = ((size_t) addr) % data_seg_alignment;
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/* if we're off alignment, then move up to the next alignment */
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if( tmp > 0 )
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addr += (data_seg_alignment - tmp);
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/* is addr past end of file ? */
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if( (unsigned char*)seg+size < addr ) {
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opal_output(0, "mca_common_sm_mmap_init: memory region too small len %d addr %p\n",
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size,addr);
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goto return_error;
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}
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map->data_addr = addr;
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} else {
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map->data_addr = NULL;
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}
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mem_offset = addr-(unsigned char *)seg;
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map->map_addr = (unsigned char *)seg;
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map->map_size = size;
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/* initialize the segment - only the first process to open the file */
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if( !file_previously_opened ) {
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opal_atomic_unlock(&seg->seg_lock);
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seg->seg_inited = false;
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seg->seg_offset = mem_offset;
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seg->seg_size = size;
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}
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map->hMappedObject = hMapObject;
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return map;
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return_error:
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{
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char* localbuf = NULL;
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FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, rc, 0, (LPTSTR)&localbuf, 1024, NULL );
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opal_output( 0, "%s\n", localbuf );
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LocalFree( localbuf );
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}
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if( NULL != lpvMem ) UnmapViewOfFile( lpvMem );
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if( NULL != hMapObject ) CloseHandle(hMapObject);
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return NULL;
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#endif
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}
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int mca_common_sm_mmap_fini( mca_common_sm_mmap_t* sm_mmap )
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{
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int rc = OMPI_SUCCESS;
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if( NULL != sm_mmap->map_seg ) {
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#if !defined(__WINDOWS__)
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rc = munmap((void*) sm_mmap->map_addr, sm_mmap->map_size );
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sm_mmap->map_addr = NULL;
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sm_mmap->map_size = 0;
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#else
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BOOL return_error = UnmapViewOfFile( sm_mmap->map_addr );
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if( false == return_error ) {
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rc = GetLastError();
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}
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CloseHandle(sm_mmap->hMappedObject);
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#endif /* !defined(__WINDOWS__) */
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}
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return rc;
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}
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/**
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* allocate memory from a previously allocated shared memory
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* block.
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*
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* @param size size of request, in bytes (IN)
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*
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* @retval addr virtual address
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*/
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void* mca_common_sm_mmap_seg_alloc(
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struct mca_mpool_base_module_t* mpool,
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size_t* size,
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mca_mpool_base_registration_t** registration)
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{
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mca_common_sm_mmap_t* map = mca_common_sm_mmap;
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mca_common_sm_file_header_t* seg = map->map_seg;
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void* addr;
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opal_atomic_lock(&seg->seg_lock);
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if(seg->seg_offset + *size > map->map_size) {
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addr = NULL;
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} else {
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size_t fixup;
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/* add base address to segment offset */
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addr = map->data_addr + seg->seg_offset;
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seg->seg_offset += *size;
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/* fix up seg_offset so next allocation is aligned on a
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sizeof(long) boundry. Do it here so that we don't have to
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check before checking remaining size in buffer */
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if ((fixup = (seg->seg_offset & (sizeof(long) - 1))) > 0) {
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seg->seg_offset += sizeof(long) - fixup;
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}
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}
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if (NULL != registration) {
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*registration = NULL;
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}
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opal_atomic_unlock(&seg->seg_lock);
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return addr;
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}
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