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openmpi/ompi/mca/btl/self/btl_self.c
Galen Shipman 3401bd2b07 Add optional ordering to the BTL interface. 
This is required to tighten up the BTL semantics. Ordering is not guaranteed,
but, if the BTL returns a order tag in a descriptor (other than
MCA_BTL_NO_ORDER) then we may request another descriptor that will obey
ordering w.r.t. to the other descriptor.


This will allow sane behavior for RDMA networks, where local completion of an
RDMA operation on the active side does not imply remote completion on the
passive side. If we send a FIN message after local completion and the FIN is
not ordered w.r.t. the RDMA operation then badness may occur as the passive
side may now try to deregister the memory and the RDMA operation may still be
pending on the passive side. 

Note that this has no impact on networks that don't suffer from this
limitation as the ORDER tag can simply always be specified as
MCA_BTL_NO_ORDER.

This commit was SVN r14768.
2007-05-24 19:51:26 +00:00

425 строки
12 KiB
C
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/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2006 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "opal/threads/mutex.h"
#include "ompi/datatype/convertor.h"
#include "ompi/datatype/datatype.h"
#include "opal/sys/atomic.h"
#include "opal/util/output.h"
#include "opal/util/if.h"
#include "orte/util/proc_info.h"
#include "opal/util/printf.h"
#include "orte/util/sys_info.h"
#include "ompi/class/ompi_fifo.h"
#include "ompi/class/ompi_free_list.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/btl/btl.h"
#include "ompi/mca/mpool/base/base.h"
#include "btl_self.h"
#include "btl_self_frag.h"
#include "ompi/proc/proc.h"
mca_btl_base_module_t mca_btl_self = {
&mca_btl_self_component.super,
0, /* btl_eager_limit */
0, /* btl_min_send_size */
0, /* btl_max_send_size */
0, /* btl_rdma_pipeline_offset */
0, /* btl_rdma_pipeline_frag_size */
0, /* btl_min_rdma_pipeline_size */
0, /* btl_exclusivity */
0, /* btl_latency */
0, /* btl_bandwidth */
0, /* btl flags */
mca_btl_self_add_procs,
mca_btl_self_del_procs,
mca_btl_self_register,
mca_btl_self_finalize,
mca_btl_self_alloc,
mca_btl_self_free,
mca_btl_self_prepare_src,
mca_btl_self_prepare_dst,
mca_btl_self_send,
mca_btl_self_rdma, /* put */
mca_btl_self_rdma, /* get */
mca_btl_base_dump,
NULL, /* mpool */
NULL, /* register error cb */
mca_btl_self_ft_event
};
int mca_btl_self_add_procs( struct mca_btl_base_module_t* btl,
size_t nprocs,
struct ompi_proc_t **procs,
struct mca_btl_base_endpoint_t **peers,
ompi_bitmap_t* reachability )
{
int i;
for( i = 0; i < (int)nprocs; i++ ) {
if( procs[i] == ompi_proc_local_proc ) {
ompi_bitmap_set_bit( reachability, i );
break; /* there will always be only one ... */
}
}
return OMPI_SUCCESS;
}
int mca_btl_self_del_procs( struct mca_btl_base_module_t* btl,
size_t nprocs,
struct ompi_proc_t **procs,
struct mca_btl_base_endpoint_t **peers )
{
return OMPI_SUCCESS;
}
/**
* MCA->BTL Clean up any resources held by BTL module
* before the module is unloaded.
*
* @param btl (IN) BTL module.
*
* Prior to unloading a BTL module, the MCA framework will call
* the BTL finalize method of the module. Any resources held by
* the BTL should be released and if required the memory corresponding
* to the BTL module freed.
*
*/
int mca_btl_self_finalize(struct mca_btl_base_module_t* btl)
{
return OMPI_SUCCESS;
}
/**
* Register a callback function that is called on receipt
* of a fragment.
*
* @param btl (IN) BTL module
* @return Status indicating if cleanup was successful
*
* When the process list changes, the PML notifies the BTL of the
* change, to provide the opportunity to cleanup or release any
* resources associated with the peer.
*/
int mca_btl_self_register( struct mca_btl_base_module_t* btl,
mca_btl_base_tag_t tag,
mca_btl_base_module_recv_cb_fn_t cbfunc,
void* cbdata )
{
mca_btl_self_component.self_reg[tag].cbfunc = cbfunc;
mca_btl_self_component.self_reg[tag].cbdata = cbdata;
return OMPI_SUCCESS;
}
/**
* Allocate a segment.
*
* @param btl (IN) BTL module
* @param size (IN) Request segment size.
*/
mca_btl_base_descriptor_t* mca_btl_self_alloc( struct mca_btl_base_module_t* btl,
uint8_t order,
size_t size )
{
mca_btl_self_frag_t* frag;
int rc;
if(size <= mca_btl_self.btl_eager_limit) {
MCA_BTL_SELF_FRAG_ALLOC_EAGER(frag,rc);
frag->segment.seg_len = size;
} else if (size <= btl->btl_max_send_size) {
MCA_BTL_SELF_FRAG_ALLOC_SEND(frag,rc);
frag->segment.seg_len = size;
} else {
return NULL;
}
frag->base.des_flags = 0;
frag->base.des_src = &(frag->segment);
frag->base.des_src_cnt = 1;
return (mca_btl_base_descriptor_t*)frag;
}
/**
* Return a segment allocated by this BTL.
*
* @param btl (IN) BTL module
* @param segment (IN) Allocated segment.
*/
int mca_btl_self_free( struct mca_btl_base_module_t* btl,
mca_btl_base_descriptor_t* des )
{
mca_btl_self_frag_t* frag = (mca_btl_self_frag_t*)des;
frag->base.des_src = NULL;
frag->base.des_src_cnt = 0;
frag->base.des_dst = NULL;
frag->base.des_dst_cnt = 0;
if(frag->size == mca_btl_self.btl_eager_limit) {
MCA_BTL_SELF_FRAG_RETURN_EAGER(frag);
} else if (frag->size == mca_btl_self.btl_max_send_size) {
MCA_BTL_SELF_FRAG_RETURN_SEND(frag);
} else {
MCA_BTL_SELF_FRAG_RETURN_RDMA(frag);
}
return OMPI_SUCCESS;
}
/**
* Prepare data for send/put
*
* @param btl (IN) BTL module
*/
struct mca_btl_base_descriptor_t* mca_btl_self_prepare_src(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
mca_mpool_base_registration_t* registration,
struct ompi_convertor_t* convertor,
uint8_t order,
size_t reserve,
size_t* size)
{
mca_btl_self_frag_t* frag;
struct iovec iov;
uint32_t iov_count = 1;
size_t max_data = *size;
int rc;
/* non-contigous data */
if( ompi_convertor_need_buffers(convertor) ||
max_data < mca_btl_self.btl_max_send_size ||
reserve != 0 ) {
MCA_BTL_SELF_FRAG_ALLOC_SEND(frag, rc);
if(NULL == frag) {
return NULL;
}
if(reserve + max_data > frag->size) {
max_data = frag->size - reserve;
}
iov.iov_len = max_data;
iov.iov_base = (IOVBASE_TYPE*)((unsigned char*)(frag+1) + reserve);
rc = ompi_convertor_pack(convertor, &iov, &iov_count, &max_data );
if(rc < 0) {
MCA_BTL_SELF_FRAG_RETURN_SEND(frag);
return NULL;
}
frag->base.des_flags = 0;
frag->segment.seg_addr.pval = frag+1;
frag->segment.seg_len = reserve + max_data;
*size = max_data;
} else {
MCA_BTL_SELF_FRAG_ALLOC_RDMA(frag, rc);
if(NULL == frag) {
return NULL;
}
iov.iov_len = max_data;
iov.iov_base = NULL;
/* convertor should return offset into users buffer */
rc = ompi_convertor_pack(convertor, &iov, &iov_count, &max_data );
if(rc < 0) {
MCA_BTL_SELF_FRAG_RETURN_RDMA(frag);
return NULL;
}
frag->segment.seg_addr.pval = iov.iov_base;
frag->segment.seg_len = max_data;
frag->base.des_flags = 0;
*size = max_data;
}
frag->base.des_src = &frag->segment;
frag->base.des_src_cnt = 1;
frag->segment.seg_key.key64 = (uint64_t)(intptr_t)convertor;
return &frag->base;
}
/**
* Prepare data for receive.
*/
struct mca_btl_base_descriptor_t* mca_btl_self_prepare_dst(
struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
mca_mpool_base_registration_t* registration,
struct ompi_convertor_t* convertor,
uint8_t order,
size_t reserve,
size_t* size)
{
mca_btl_self_frag_t* frag;
size_t max_data = *size;
int rc;
MCA_BTL_SELF_FRAG_ALLOC_RDMA(frag, rc);
if(NULL == frag) {
return NULL;
}
/* setup descriptor to point directly to user buffer */
ompi_convertor_get_current_pointer( convertor, (void**)&(frag->segment.seg_addr.pval) );
frag->segment.seg_len = reserve + max_data;
frag->segment.seg_key.key64 = (uint64_t)(intptr_t)convertor;
frag->base.des_dst = &frag->segment;
frag->base.des_dst_cnt = 1;
frag->base.des_flags = 0;
return &frag->base;
}
/**
* Initiate a send to the peer.
*
* @param btl (IN) BTL module
* @param peer (IN) BTL peer addressing
*/
int mca_btl_self_send( struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* des,
mca_btl_base_tag_t tag )
{
/**
* We have to set the dst before the call to the function and reset them
* after.
*/
des->des_dst = des->des_src;
des->des_dst_cnt = des->des_src_cnt;
/* upcall */
mca_btl_self_component.self_reg[tag].cbfunc( btl, tag, des, (void*)OMPI_SUCCESS );
des->des_dst = NULL;
des->des_dst_cnt = 0;
/* send completion */
des->des_cbfunc(btl,endpoint,des,OMPI_SUCCESS);
return OMPI_SUCCESS;
}
/**
* Initiate a put to the peer.
*
* @param btl (IN) BTL module
* @param peer (IN) BTL peer addressing
*/
int mca_btl_self_rdma( struct mca_btl_base_module_t* btl,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* des )
{
mca_btl_base_segment_t* src = des->des_src;
mca_btl_base_segment_t* dst = des->des_dst;
size_t src_cnt = des->des_src_cnt;
size_t dst_cnt = des->des_dst_cnt;
unsigned char* src_addr = (unsigned char*)src->seg_addr.pval;
size_t src_len = src->seg_len;
unsigned char* dst_addr = (unsigned char*)ompi_ptr_ltop(dst->seg_addr.lval);
size_t dst_len = dst->seg_len;
while(src_len && dst_len) {
if(src_len == dst_len) {
memcpy(dst_addr, src_addr, src_len);
/* advance src */
if(--src_cnt != 0) {
src++;
src_addr = (unsigned char*)src->seg_addr.pval;
src_len = src->seg_len;
} else {
src_len = 0;
}
/* advance dst */
if(--dst_cnt != 0) {
dst++;
dst_addr = (unsigned char*)dst->seg_addr.pval;
dst_len = dst->seg_len;
} else {
dst_len = 0;
}
} else {
size_t bytes = src_len < dst_len ? src_len : dst_len;
memcpy(dst_addr, src_addr, bytes);
/* advance src */
src_len -= bytes;
if(src_len == 0) {
if(--src_cnt != 0) {
src++;
src_addr = (unsigned char*)src->seg_addr.pval;
src_len = src->seg_len;
}
} else {
src_addr += bytes;
}
/* advance dst */
dst_len -= bytes;
if(dst_len == 0) {
if(--dst_cnt != 0) {
dst++;
dst_addr = (unsigned char*)src->seg_addr.pval;
dst_len = src->seg_len;
}
} else {
dst_addr += bytes;
}
}
}
/* rdma completion */
des->des_cbfunc(btl,endpoint,des,OMPI_SUCCESS);
return OMPI_SUCCESS;
}
int mca_btl_self_ft_event(int state) {
if(OPAL_CRS_CHECKPOINT == state) {
;
}
else if(OPAL_CRS_CONTINUE == state) {
;
}
else if(OPAL_CRS_RESTART == state) {
;
}
else if(OPAL_CRS_TERM == state ) {
;
}
else {
;
}
return OMPI_SUCCESS;
}
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