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openmpi/ompi/mca/osc/rdma/osc_rdma_component.c
Nathan Hjelm 49d2f44b97 osc/rdma: use correct endpoint for local state 
If atomics are not globally visible (cpu and nic atomics do not mix)
then a btl endpoint must be used to access local ranks. To avoid
issues that are caused by having the same region registered with
multiple handles osc/rdma was updated to always use the handle for
rank 0. There was a bug in the update that caused osc/rdma to continue
using the local endpoint for accessing the state even though the
pointer/handle are not valid for that endpoint. This commit fixes the
bug.

Fixes open-mpi/ompi#1241.

Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
2016-01-22 10:41:27 -07:00

1241 строка
47 KiB
C
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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 2004-2008 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 (c) 2007-2016 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2006-2008 University of Houston. All rights reserved.
* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012-2015 Sandia National Laboratories. All rights reserved.
* Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
* Copyright (c) 2015 Intel, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <string.h>
#include "osc_rdma.h"
#include "osc_rdma_frag.h"
#include "osc_rdma_request.h"
#include "osc_rdma_active_target.h"
#include "osc_rdma_passive_target.h"
#include "osc_rdma_comm.h"
#include "osc_rdma_dynamic.h"
#include "osc_rdma_accumulate.h"
#include "opal/threads/mutex.h"
#include "opal/util/arch.h"
#include "opal/util/argv.h"
#include "opal/align.h"
#if OPAL_CUDA_SUPPORT
#include "opal/datatype/opal_datatype_cuda.h"
#endif /* OPAL_CUDA_SUPPORT */
#include "ompi/info/info.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/osc/osc.h"
#include "ompi/mca/osc/base/base.h"
#include "ompi/mca/osc/base/osc_base_obj_convert.h"
#include "ompi/mca/pml/pml.h"
#include "opal/mca/btl/base/base.h"
#include "opal/mca/base/mca_base_pvar.h"
#include "ompi/mca/bml/base/base.h"
static int ompi_osc_rdma_component_register (void);
static int ompi_osc_rdma_component_init (bool enable_progress_threads, bool enable_mpi_threads);
static int ompi_osc_rdma_component_finalize (void);
static int ompi_osc_rdma_component_query (struct ompi_win_t *win, void **base, size_t size, int disp_unit,
struct ompi_communicator_t *comm, struct ompi_info_t *info,
int flavor);
static int ompi_osc_rdma_component_select (struct ompi_win_t *win, void **base, size_t size, int disp_unit,
struct ompi_communicator_t *comm, struct ompi_info_t *info,
int flavor, int *model);
static int ompi_osc_rdma_set_info (struct ompi_win_t *win, struct ompi_info_t *info);
static int ompi_osc_rdma_get_info (struct ompi_win_t *win, struct ompi_info_t **info_used);
static int ompi_osc_rdma_query_btls (ompi_communicator_t *comm, struct mca_btl_base_module_t **btl);
static char *ompi_osc_rdma_btl_names;
ompi_osc_rdma_component_t mca_osc_rdma_component = {
.super = {
.osc_version = {
OMPI_OSC_BASE_VERSION_3_0_0,
.mca_component_name = "rdma",
MCA_BASE_MAKE_VERSION(component, OMPI_MAJOR_VERSION, OMPI_MINOR_VERSION,
OMPI_RELEASE_VERSION),
.mca_register_component_params = ompi_osc_rdma_component_register
},
.osc_data = {
/* The component is not checkpoint ready */
MCA_BASE_METADATA_PARAM_NONE
},
.osc_init = ompi_osc_rdma_component_init,
.osc_query = ompi_osc_rdma_component_query,
.osc_select = ompi_osc_rdma_component_select,
.osc_finalize = ompi_osc_rdma_component_finalize
}
};
ompi_osc_base_module_t ompi_osc_rdma_module_rdma_template = {
.osc_win_attach = ompi_osc_rdma_attach,
.osc_win_detach = ompi_osc_rdma_detach,
.osc_free = ompi_osc_rdma_free,
.osc_put = ompi_osc_rdma_put,
.osc_get = ompi_osc_rdma_get,
.osc_accumulate = ompi_osc_rdma_accumulate,
.osc_compare_and_swap = ompi_osc_rdma_compare_and_swap,
.osc_fetch_and_op = ompi_osc_rdma_fetch_and_op,
.osc_get_accumulate = ompi_osc_rdma_get_accumulate,
.osc_rput = ompi_osc_rdma_rput,
.osc_rget = ompi_osc_rdma_rget,
.osc_raccumulate = ompi_osc_rdma_raccumulate,
.osc_rget_accumulate = ompi_osc_rdma_rget_accumulate,
.osc_fence = ompi_osc_rdma_fence_atomic,
.osc_start = ompi_osc_rdma_start_atomic,
.osc_complete = ompi_osc_rdma_complete_atomic,
.osc_post = ompi_osc_rdma_post_atomic,
.osc_wait = ompi_osc_rdma_wait_atomic,
.osc_test = ompi_osc_rdma_test_atomic,
.osc_lock = ompi_osc_rdma_lock_atomic,
.osc_unlock = ompi_osc_rdma_unlock_atomic,
.osc_lock_all = ompi_osc_rdma_lock_all_atomic,
.osc_unlock_all = ompi_osc_rdma_unlock_all_atomic,
.osc_sync = ompi_osc_rdma_sync,
.osc_flush = ompi_osc_rdma_flush,
.osc_flush_all = ompi_osc_rdma_flush_all,
.osc_flush_local = ompi_osc_rdma_flush_local,
.osc_flush_local_all = ompi_osc_rdma_flush_local_all,
.osc_set_info = ompi_osc_rdma_set_info,
.osc_get_info = ompi_osc_rdma_get_info
};
/* look up parameters for configuring this window. The code first
looks in the info structure passed by the user, then it checks
for a matching MCA variable. */
static bool check_config_value_bool (char *key, ompi_info_t *info)
{
int ret, flag, param;
bool result = false;
const bool *flag_value = &result;
ret = ompi_info_get_bool (info, key, &result, &flag);
if (OMPI_SUCCESS == ret && flag) {
return result;
}
param = mca_base_var_find("ompi", "osc", "rdma", key);
if (0 <= param) {
(void) mca_base_var_get_value(param, &flag_value, NULL, NULL);
}
return flag_value[0];
}
static int ompi_osc_rdma_pvar_read (const struct mca_base_pvar_t *pvar, void *value, void *obj)
{
ompi_win_t *win = (ompi_win_t *) obj;
ompi_osc_rdma_module_t *module = GET_MODULE(win);
int offset = (int) (intptr_t) pvar->ctx;
memcpy (value, (char *) module + offset, sizeof (unsigned long));
return OMPI_SUCCESS;
}
static int ompi_osc_rdma_component_register (void)
{
mca_osc_rdma_component.no_locks = false;
(void) mca_base_component_var_register(&mca_osc_rdma_component.super.osc_version,
"no_locks", "Enable optimizations available only if MPI_LOCK is "
"not used. Info key of same name overrides this value (default: false)",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, 0, OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_GROUP, &mca_osc_rdma_component.no_locks);
mca_osc_rdma_component.buffer_size = 32768;
(void) mca_base_component_var_register (&mca_osc_rdma_component.super.osc_version, "buffer_size",
"Size of temporary buffers (default: 32k)", MCA_BASE_VAR_TYPE_UNSIGNED_INT,
NULL, 0, 0, OPAL_INFO_LVL_3, MCA_BASE_VAR_SCOPE_LOCAL,
&mca_osc_rdma_component.buffer_size);
mca_osc_rdma_component.max_attach = 32;
(void) mca_base_component_var_register (&mca_osc_rdma_component.super.osc_version, "max_attach",
"Maximum number of buffers that can be attached to a dynamic window. "
"Keep in mind that each attached buffer will use a potentially limited "
"resource (default: 32)", MCA_BASE_VAR_TYPE_UNSIGNED_INT, NULL, 0, 0,
OPAL_INFO_LVL_3, MCA_BASE_VAR_SCOPE_GROUP, &mca_osc_rdma_component.max_attach);
mca_osc_rdma_component.aggregation_limit = 1024;
(void) mca_base_component_var_register (&mca_osc_rdma_component.super.osc_version, "aggregation_limit",
"Maximum size of an aggregated put/get. Messages are aggregated for consecutive"
"put and get operations. In some cases this may lead to higher latency but "
"should also lead to higher bandwidth utilization. Set to 0 to disable (default:"
" 1k)", MCA_BASE_VAR_TYPE_UNSIGNED_INT, NULL, 0, 0, OPAL_INFO_LVL_3,
MCA_BASE_VAR_SCOPE_GROUP, &mca_osc_rdma_component.aggregation_limit);
mca_osc_rdma_component.priority = 90;
(void) mca_base_component_var_register (&mca_osc_rdma_component.super.osc_version, "priority",
"Priority of the osc/rdma component (default: 90)",
MCA_BASE_VAR_TYPE_UNSIGNED_INT, NULL, 0, 0, OPAL_INFO_LVL_3,
MCA_BASE_VAR_SCOPE_GROUP, &mca_osc_rdma_component.priority);
ompi_osc_rdma_btl_names = "openib,ugni";
(void) mca_base_component_var_register (&mca_osc_rdma_component.super.osc_version, "btls",
"Comma-delimited list of BTL component names to allow without verifying "
"connectivity. Do not add a BTL to to this list unless it can reach all "
"processes in any communicator used with an MPI window (default: openib,ugni)",
MCA_BASE_VAR_TYPE_STRING, NULL, 0, 0, OPAL_INFO_LVL_3,
MCA_BASE_VAR_SCOPE_GROUP, &ompi_osc_rdma_btl_names);
/* register performance variables */
(void) mca_base_component_pvar_register (&mca_osc_rdma_component.super.osc_version, "put_retry_count",
"Number of times put transaction were retried due to resource limitations",
OPAL_INFO_LVL_4, MCA_BASE_PVAR_CLASS_COUNTER, MCA_BASE_VAR_TYPE_UNSIGNED_LONG,
NULL, MCA_BASE_VAR_BIND_MPI_WIN, MCA_BASE_PVAR_FLAG_CONTINUOUS,
ompi_osc_rdma_pvar_read, NULL, NULL,
(void *) (intptr_t) offsetof (ompi_osc_rdma_module_t, put_retry_count));
(void) mca_base_component_pvar_register (&mca_osc_rdma_component.super.osc_version, "get_retry_count",
"Number of times get transaction were retried due to resource limitations",
OPAL_INFO_LVL_4, MCA_BASE_PVAR_CLASS_COUNTER, MCA_BASE_VAR_TYPE_UNSIGNED_LONG,
NULL, MCA_BASE_VAR_BIND_MPI_WIN, MCA_BASE_PVAR_FLAG_CONTINUOUS,
ompi_osc_rdma_pvar_read, NULL, NULL,
(void *) (intptr_t) offsetof (ompi_osc_rdma_module_t, get_retry_count));
return OMPI_SUCCESS;
}
static int ompi_osc_rdma_component_init (bool enable_progress_threads,
bool enable_mpi_threads)
{
int ret;
OBJ_CONSTRUCT(&mca_osc_rdma_component.lock, opal_mutex_t);
OBJ_CONSTRUCT(&mca_osc_rdma_component.request_gc, opal_list_t);
OBJ_CONSTRUCT(&mca_osc_rdma_component.buffer_gc, opal_list_t);
OBJ_CONSTRUCT(&mca_osc_rdma_component.modules, opal_hash_table_t);
opal_hash_table_init(&mca_osc_rdma_component.modules, 2);
OBJ_CONSTRUCT(&mca_osc_rdma_component.frags, opal_free_list_t);
ret = opal_free_list_init (&mca_osc_rdma_component.frags,
sizeof(ompi_osc_rdma_frag_t), 8,
OBJ_CLASS(ompi_osc_rdma_frag_t),
mca_osc_rdma_component.buffer_size, 8,
4, -1, 4, NULL, 0, NULL, NULL, NULL);
if (OPAL_SUCCESS != ret) {
opal_output_verbose(1, ompi_osc_base_framework.framework_output,
"%s:%d: opal_free_list_init_new failed: %d",
__FILE__, __LINE__, ret);
return ret;
}
OBJ_CONSTRUCT(&mca_osc_rdma_component.requests, opal_free_list_t);
ret = opal_free_list_init (&mca_osc_rdma_component.requests,
sizeof(ompi_osc_rdma_request_t), 8,
OBJ_CLASS(ompi_osc_rdma_request_t), 0, 0,
0, -1, 32, NULL, 0, NULL, NULL, NULL);
if (OPAL_SUCCESS != ret) {
opal_output_verbose(1, ompi_osc_base_framework.framework_output,
"%s:%d: opal_free_list_init failed: %d\n",
__FILE__, __LINE__, ret);
}
OBJ_CONSTRUCT(&mca_osc_rdma_component.aggregate, opal_free_list_t);
if (!enable_mpi_threads && mca_osc_rdma_component.aggregation_limit) {
ret = opal_free_list_init (&mca_osc_rdma_component.aggregate,
sizeof(ompi_osc_rdma_aggregation_t), 8,
OBJ_CLASS(ompi_osc_rdma_aggregation_t), 0, 0,
32, 128, 32, NULL, 0, NULL, NULL, NULL);
if (OPAL_SUCCESS != ret) {
opal_output_verbose(1, ompi_osc_base_framework.framework_output,
"%s:%d: opal_free_list_init failed: %d\n",
__FILE__, __LINE__, ret);
}
} else {
/* only enable put aggregation when not using threads */
mca_osc_rdma_component.aggregation_limit = 0;
}
return ret;
}
int ompi_osc_rdma_component_finalize (void)
{
size_t num_modules;
if (0 != (num_modules = opal_hash_table_get_size(&mca_osc_rdma_component.modules))) {
opal_output(ompi_osc_base_framework.framework_output, "WARNING: There were %d Windows created but "
"not freed.", (int) num_modules);
}
OBJ_DESTRUCT(&mca_osc_rdma_component.frags);
OBJ_DESTRUCT(&mca_osc_rdma_component.modules);
OBJ_DESTRUCT(&mca_osc_rdma_component.lock);
OBJ_DESTRUCT(&mca_osc_rdma_component.requests);
OBJ_DESTRUCT(&mca_osc_rdma_component.request_gc);
OBJ_DESTRUCT(&mca_osc_rdma_component.buffer_gc);
OBJ_DESTRUCT(&mca_osc_rdma_component.aggregate);
return OMPI_SUCCESS;
}
static int ompi_osc_rdma_component_query (struct ompi_win_t *win, void **base, size_t size, int disp_unit,
struct ompi_communicator_t *comm, struct ompi_info_t *info,
int flavor)
{
if (MPI_WIN_FLAVOR_SHARED == flavor) {
return -1;
}
#if OPAL_CUDA_SUPPORT
/* GPU buffers are not supported by the rdma component */
if (MPI_WIN_FLAVOR_CREATE == flavor) {
if (opal_cuda_check_bufs(*base, NULL)) {
return -1;
}
}
#endif /* OPAL_CUDA_SUPPORT */
if (OMPI_SUCCESS != ompi_osc_rdma_query_btls (comm, NULL)) {
return -1;
}
return mca_osc_rdma_component.priority;
}
#define RANK_ARRAY_COUNT(module) ((ompi_comm_size ((module)->comm) + (module)->node_count - 1) / (module)->node_count)
static int ompi_osc_rdma_initialize_region (ompi_osc_rdma_module_t *module, void **base, size_t size) {
ompi_osc_rdma_region_t *region = (ompi_osc_rdma_region_t *) module->state->regions;
int ret;
/* store displacement unit */
module->state->disp_unit = module->disp_unit;
/* store region info */
module->state->region_count = 1;
region->base = (osc_rdma_base_t) (intptr_t) *base;
region->len = size;
if (module->selected_btl->btl_register_mem && size) {
if (MPI_WIN_FLAVOR_ALLOCATE != module->flavor || NULL == module->state_handle) {
ret = ompi_osc_rdma_register (module, MCA_BTL_ENDPOINT_ANY, *base, size, MCA_BTL_REG_FLAG_ACCESS_ANY,
&module->base_handle);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
memcpy (region->btl_handle_data, module->base_handle, module->selected_btl->btl_registration_handle_size);
} else {
memcpy (region->btl_handle_data, module->state_handle, module->selected_btl->btl_registration_handle_size);
}
}
return OMPI_SUCCESS;
}
static int allocate_state_single (ompi_osc_rdma_module_t *module, void **base, size_t size)
{
size_t total_size, local_rank_array_size, leader_peer_data_size;
ompi_osc_rdma_peer_t *my_peer;
int ret, my_rank;
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_TRACE, "allocating private internal state");
my_rank = ompi_comm_rank (module->comm);
local_rank_array_size = sizeof (ompi_osc_rdma_rank_data_t) * RANK_ARRAY_COUNT(module);
leader_peer_data_size = module->region_size * module->node_count;
/* allocate anything that will be accessed remotely in the same region. this cuts down on the number of
* registration handles needed to access this data. */
total_size = module->state_size + local_rank_array_size + leader_peer_data_size;
if (MPI_WIN_FLAVOR_ALLOCATE == module->flavor) {
total_size += size;
}
/* the local data is ordered as follows: rank array (leader, offset mapping), state, leader peer data, and base
* (if using MPI_Win_allocate). In this case the leader peer data array does not need to be stored in the same
* segment but placing it there simplifies the peer data fetch and cleanup code. */
module->rank_array = calloc (total_size, 1);
if (OPAL_UNLIKELY(NULL == module->rank_array)) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
module->state_offset = local_rank_array_size;
module->state = (ompi_osc_rdma_state_t *) ((intptr_t) module->rank_array + module->state_offset);
module->node_comm_info = (unsigned char *) ((intptr_t) module->state + module->state_size);
if (MPI_WIN_FLAVOR_ALLOCATE == module->flavor) {
*base = (void *) ((intptr_t) module->node_comm_info + leader_peer_data_size);
}
/* just go ahead and register the whole segment */
ret = ompi_osc_rdma_register (module, MCA_BTL_ENDPOINT_ANY, module->rank_array, total_size,
MCA_BTL_REG_FLAG_ACCESS_ANY, &module->state_handle);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
return ret;
}
if (MPI_WIN_FLAVOR_DYNAMIC != module->flavor) {
ret = ompi_osc_rdma_initialize_region (module, base, size);
if (OMPI_SUCCESS != ret) {
return ret;
}
}
ret = ompi_osc_rdma_new_peer (module, my_rank, &my_peer);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
return ret;
}
ret = ompi_osc_module_add_peer (module, my_peer);
if (OPAL_UNLIKELY(OPAL_SUCCESS != ret)) {
OBJ_RELEASE(my_peer);
return ret;
}
module->free_after = module->rank_array;
my_peer->flags |= OMPI_OSC_RDMA_PEER_LOCAL_BASE;
my_peer->state = (uint64_t) (uintptr_t) module->state;
if (module->selected_btl->btl_flags & MCA_BTL_ATOMIC_SUPPORTS_GLOB) {
/* all peers are local or it is safe to mix cpu and nic atomics */
my_peer->flags |= OMPI_OSC_RDMA_PEER_LOCAL_STATE;
} else {
/* use my endpoint handle to modify the peer's state */
my_peer->state_handle = module->state_handle;
my_peer->state_endpoint = ompi_osc_rdma_peer_btl_endpoint (module, my_rank);
}
if (MPI_WIN_FLAVOR_DYNAMIC != module->flavor) {
ompi_osc_rdma_peer_extended_t *ex_peer = (ompi_osc_rdma_peer_extended_t *) my_peer;
ex_peer->super.base = (intptr_t) *base;
if (!module->same_size) {
ex_peer->size = size;
}
if (MPI_WIN_FLAVOR_ALLOCATE == module->flavor) {
ex_peer->super.base_handle = module->state_handle;
}
}
return OMPI_SUCCESS;
}
struct _local_data {
int rank;
size_t size;
};
static int allocate_state_shared (ompi_osc_rdma_module_t *module, void **base, size_t size)
{
ompi_communicator_t *shared_comm;
unsigned long offset, total_size;
unsigned long state_base, data_base;
int local_rank, local_size, ret;
size_t local_rank_array_size, leader_peer_data_size;
int my_rank = ompi_comm_rank (module->comm);
int global_size = ompi_comm_size (module->comm);
ompi_osc_rdma_region_t *state_region;
int my_base_offset = 0;
struct _local_data *temp;
char *data_file;
shared_comm = module->shared_comm;
local_rank = ompi_comm_rank (shared_comm);
local_size = ompi_comm_size (shared_comm);
if (1 == local_size) {
/* no point using a shared segment if there are no other processes on this node */
return allocate_state_single (module, base, size);
}
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_TRACE, "allocating shared internal state");
local_rank_array_size = sizeof (ompi_osc_rdma_rank_data_t) * RANK_ARRAY_COUNT (module);
leader_peer_data_size = module->region_size * module->node_count;
/* calculate base offsets */
module->state_offset = state_base = local_rank_array_size + module->region_size;
data_base = state_base + leader_peer_data_size + module->state_size * local_size;
do {
temp = calloc (local_size, sizeof (temp[0]));
if (NULL == temp) {
ret = OMPI_ERR_OUT_OF_RESOURCE;
break;
}
temp[local_rank].rank = my_rank;
temp[local_rank].size = size;
/* gather the local sizes and ranks */
ret = shared_comm->c_coll.coll_allgather (MPI_IN_PLACE, sizeof (*temp), MPI_BYTE, temp, sizeof (*temp),
MPI_BYTE, shared_comm, shared_comm->c_coll.coll_allgather_module);
if (OMPI_SUCCESS != ret) {
break;
}
total_size = data_base;
if (MPI_WIN_FLAVOR_ALLOCATE == module->flavor) {
for (int i = 0 ; i < local_size ; ++i) {
total_size += temp[i].size;
if (local_rank == i) {
my_base_offset = total_size;
}
}
}
/* allocate the shared memory segment */
ret = asprintf (&data_file, "%s"OPAL_PATH_SEP"window_%d.%s",
ompi_process_info.job_session_dir, ompi_comm_get_cid (module->comm),
ompi_process_info.nodename);
if (0 > ret) {
ret = OMPI_ERR_OUT_OF_RESOURCE;
break;
}
if (0 == local_rank) {
/* allocate enough space for the state + data for all local ranks */
ret = opal_shmem_segment_create (&module->seg_ds, data_file, total_size);
free (data_file);
if (OPAL_SUCCESS != ret) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to create shared memory segment");
break;
}
}
ret = module->comm->c_coll.coll_bcast (&module->seg_ds, sizeof (module->seg_ds), MPI_BYTE, 0,
shared_comm, shared_comm->c_coll.coll_bcast_module);
if (OMPI_SUCCESS != ret) {
break;
}
module->segment_base = opal_shmem_segment_attach (&module->seg_ds);
if (NULL == module->segment_base) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to attach to the shared memory segment");
ret = OPAL_ERROR;
break;
}
if (size && MPI_WIN_FLAVOR_ALLOCATE == module->flavor) {
*base = (void *)((intptr_t) module->segment_base + my_base_offset);
}
module->rank_array = (ompi_osc_rdma_rank_data_t *) module->segment_base;
/* put local state region data after the rank array */
state_region = (ompi_osc_rdma_region_t *) ((uintptr_t) module->segment_base + local_rank_array_size);
module->state = (ompi_osc_rdma_state_t *) ((uintptr_t) module->segment_base + state_base + module->state_size * local_rank);
/* all local ranks share the array containing the peer data of leader ranks */
module->node_comm_info = (unsigned char *) ((uintptr_t) module->segment_base + state_base + module->state_size * local_size);
/* initialize my state */
memset (module->state, 0, module->state_size);
if (0 == local_rank) {
/* just go ahead and register the whole segment */
ret = ompi_osc_rdma_register (module, MCA_BTL_ENDPOINT_ANY, module->segment_base, total_size, MCA_BTL_REG_FLAG_ACCESS_ANY,
&module->state_handle);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
break;
}
state_region->base = (intptr_t) module->segment_base;
if (module->state_handle) {
memcpy (state_region->btl_handle_data, module->state_handle, module->selected_btl->btl_registration_handle_size);
}
}
if (MPI_WIN_FLAVOR_DYNAMIC != module->flavor) {
ret = ompi_osc_rdma_initialize_region (module, base, size);
if (OMPI_SUCCESS != ret) {
break;
}
}
/* barrier to make sure all ranks have attached */
shared_comm->c_coll.coll_barrier(shared_comm, shared_comm->c_coll.coll_barrier_module);
/* unlink the shared memory backing file */
if (0 == local_rank) {
opal_shmem_unlink (&module->seg_ds);
}
offset = data_base;
for (int i = 0 ; i < local_size ; ++i) {
ompi_osc_rdma_peer_extended_t *ex_peer;
ompi_osc_rdma_state_t *peer_state;
ompi_osc_rdma_peer_t *peer;
int peer_rank = temp[i].rank;
ret = ompi_osc_rdma_new_peer (module, peer_rank, &peer);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
break;
}
ex_peer = (ompi_osc_rdma_peer_extended_t *) peer;
/* peer state local pointer */
peer_state = (ompi_osc_rdma_state_t *) ((uintptr_t) module->segment_base + state_base + module->state_size * i);
if (local_size == global_size || (module->selected_btl->btl_flags & MCA_BTL_ATOMIC_SUPPORTS_GLOB)) {
/* all peers are local or it is safe to mix cpu and nic atomics */
peer->flags |= OMPI_OSC_RDMA_PEER_LOCAL_STATE;
peer->state = (osc_rdma_counter_t) peer_state;
} else {
/* use my endpoint handle to modify the peer's state */
if (module->selected_btl->btl_register_mem) {
peer->state_handle = (mca_btl_base_registration_handle_t *) state_region->btl_handle_data;
}
peer->state = (osc_rdma_counter_t) ((uintptr_t) state_region->base + state_base + module->state_size * i);
peer->state_endpoint = ompi_osc_rdma_peer_btl_endpoint (module, temp[0].rank);
}
/* finish setting up the local peer structure */
if (MPI_WIN_FLAVOR_DYNAMIC != module->flavor) {
if (!module->same_disp_unit) {
ex_peer->disp_unit = peer_state->disp_unit;
}
if (!module->same_size) {
ex_peer->size = temp[i].size;
}
if (my_rank == peer_rank) {
peer->flags |= OMPI_OSC_RDMA_PEER_LOCAL_BASE;
}
if (MPI_WIN_FLAVOR_ALLOCATE == module->flavor) {
if (temp[i].size) {
ex_peer->super.base = (uint64_t) (uintptr_t) module->segment_base + offset;
} else {
ex_peer->super.base = 0;
}
peer->flags |= OMPI_OSC_RDMA_PEER_LOCAL_BASE;
offset += temp[i].size;
} else {
ompi_osc_rdma_region_t *peer_region = (ompi_osc_rdma_region_t *) peer_state->regions;
ex_peer->super.base = peer_region->base;
if (module->selected_btl->btl_register_mem) {
ex_peer->super.base_handle = (mca_btl_base_registration_handle_t *) peer_region->btl_handle_data;
}
}
}
ompi_osc_module_add_peer (module, peer);
}
} while (0);
free (temp);
return ret;
}
static int ompi_osc_rdma_query_btls (ompi_communicator_t *comm, struct mca_btl_base_module_t **btl)
{
struct mca_btl_base_module_t **possible_btls = NULL;
int comm_size = ompi_comm_size (comm);
int rc = OMPI_SUCCESS, max_btls = 0;
unsigned int selected_latency = INT_MAX;
struct mca_btl_base_module_t *selected_btl = NULL;
mca_btl_base_selected_module_t *item;
int *btl_counts = NULL;
char **btls_to_use;
void *tmp;
btls_to_use = opal_argv_split (ompi_osc_rdma_btl_names, ',');
if (btls_to_use) {
/* rdma and atomics are only supported with BTLs at the moment */
OPAL_LIST_FOREACH(item, &mca_btl_base_modules_initialized, mca_btl_base_selected_module_t) {
for (int i = 0 ; btls_to_use[i] ; ++i) {
if (0 != strcmp (btls_to_use[i], item->btl_module->btl_component->btl_version.mca_component_name)) {
continue;
}
if ((item->btl_module->btl_flags & (MCA_BTL_FLAGS_RDMA)) == MCA_BTL_FLAGS_RDMA &&
(item->btl_module->btl_flags & (MCA_BTL_FLAGS_ATOMIC_FOPS | MCA_BTL_FLAGS_ATOMIC_OPS))) {
if (!selected_btl || item->btl_module->btl_latency < selected_btl->btl_latency) {
selected_btl = item->btl_module;
}
}
}
}
opal_argv_free (btls_to_use);
}
if (btl) {
*btl = selected_btl;
}
if (NULL != selected_btl) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "selected btl: %s",
selected_btl->btl_component->btl_version.mca_component_name);
return OMPI_SUCCESS;
}
for (int i = 0 ; i < comm_size ; ++i) {
ompi_proc_t *proc = ompi_comm_peer_lookup (comm, i);
mca_bml_base_endpoint_t *endpoint;
int num_btls, prev_max;
endpoint = mca_bml_base_get_endpoint (proc);
if (NULL == endpoint) {
/* can't continue if some peer is unreachable */
rc = OMPI_ERR_UNREACH;
break;
}
num_btls = mca_bml_base_btl_array_get_size (&endpoint->btl_rdma);
if (0 == num_btls) {
rc = OMPI_ERR_NOT_AVAILABLE;
/* at least one rank doesn't have an RDMA capable btl */
break;
}
prev_max = max_btls;
max_btls = (max_btls > num_btls) ? max_btls : num_btls;
tmp = realloc (possible_btls, sizeof (void *) * max_btls);
if (NULL == tmp) {
rc = OMPI_ERR_OUT_OF_RESOURCE;
break;
}
possible_btls = tmp;
for (int j = prev_max ; j < max_btls ; ++j) {
possible_btls[j] = NULL;
}
tmp = realloc (btl_counts, sizeof (int) * max_btls);
if (NULL == tmp) {
rc = OMPI_ERR_OUT_OF_RESOURCE;
break;
}
btl_counts = tmp;
for (int i_btl = 0 ; i_btl < num_btls ; ++i_btl) {
/* for this implementation we need only compare-and-swap and fetch-and-add */
if ((endpoint->btl_rdma.bml_btls[i_btl].btl->btl_flags & (MCA_BTL_FLAGS_RDMA | MCA_BTL_FLAGS_ATOMIC_FOPS)) ==
(MCA_BTL_FLAGS_RDMA | MCA_BTL_FLAGS_ATOMIC_FOPS) && (endpoint->btl_rdma.bml_btls[i_btl].btl->btl_atomic_flags &
MCA_BTL_ATOMIC_SUPPORTS_ADD)) {
for (int j = 0 ; j < max_btls ; ++j) {
if (endpoint->btl_rdma.bml_btls[i_btl].btl == possible_btls[j]) {
++btl_counts[j];
break;
} else if (NULL == possible_btls[j]) {
possible_btls[j] = endpoint->btl_rdma.bml_btls[i_btl].btl;
btl_counts[j] = 1;
break;
}
}
}
}
}
if (OMPI_SUCCESS != rc) {
free (possible_btls);
free (btl_counts);
/* no btl = no rdma/atomics */
return OMPI_ERR_NOT_AVAILABLE;
}
for (int i = 0 ; i < max_btls ; ++i) {
if (NULL == possible_btls[i]) {
break;
}
if (btl_counts[i] == comm_size && possible_btls[i]->btl_latency < selected_latency) {
selected_btl = possible_btls[i];
selected_latency = possible_btls[i]->btl_latency;
}
}
free (possible_btls);
free (btl_counts);
if (btl) {
*btl = selected_btl;
}
if (NULL == selected_btl) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "no suitable btls found");
/* no btl = no rdma/atomics */
return OMPI_ERR_NOT_AVAILABLE;
}
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "selected btl: %s",
selected_btl->btl_component->btl_version.mca_component_name);
return OMPI_SUCCESS;
}
static int ompi_osc_rdma_share_data (ompi_osc_rdma_module_t *module)
{
ompi_osc_rdma_region_t *my_data;
int ret, global_result;
int my_rank = ompi_comm_rank (module->comm);
int comm_size = ompi_comm_size (module->comm);
ompi_osc_rdma_rank_data_t *temp;
do {
temp = malloc (sizeof (*temp) * comm_size);
if (NULL == temp) {
ret = OMPI_ERR_OUT_OF_RESOURCE;
break;
}
/* fill in rank -> node translation */
temp[my_rank].node_id = module->node_id;
temp[my_rank].rank = ompi_comm_rank (module->shared_comm);
ret = module->comm->c_coll.coll_allgather (MPI_IN_PLACE, 1, MPI_2INT, temp, 1, MPI_2INT,
module->comm, module->comm->c_coll.coll_allgather_module);
if (OMPI_SUCCESS != ret) {
break;
}
if (0 == ompi_comm_rank (module->shared_comm)) {
/* fill in my part of the node array */
my_data = (ompi_osc_rdma_region_t *) ((intptr_t) module->node_comm_info + ompi_comm_rank (module->local_leaders) *
module->region_size);
my_data->base = (uint64_t) (intptr_t) module->rank_array;
if (module->selected_btl->btl_register_mem) {
memcpy (my_data->btl_handle_data, module->state_handle, module->selected_btl->btl_registration_handle_size);
}
/* gather state data at each node leader */
if (ompi_comm_size (module->local_leaders) > 1) {
ret = module->local_leaders->c_coll.coll_allgather (MPI_IN_PLACE, module->region_size, MPI_BYTE, module->node_comm_info,
module->region_size, MPI_BYTE, module->local_leaders,
module->local_leaders->c_coll.coll_gather_module);
if (OMPI_SUCCESS != ret) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "leader allgather failed with ompi error code %d", ret);
break;
}
}
/* fill in the local part of the rank -> node map */
for (int i = 0 ; i < RANK_ARRAY_COUNT(module) ; ++i) {
int save_rank = my_rank + i;
if (save_rank >= comm_size) {
break;
}
module->rank_array[i] = temp[save_rank];
}
}
free (temp);
} while (0);
ret = module->comm->c_coll.coll_allreduce (&ret, &global_result, 1, MPI_INT, MPI_MIN, module->comm,
module->comm->c_coll.coll_allreduce_module);
if (OMPI_SUCCESS != ret) {
global_result = ret;
}
/* none of these communicators are needed anymore so free them now*/
if (MPI_COMM_NULL != module->local_leaders) {
ompi_comm_free (&module->local_leaders);
}
if (MPI_COMM_NULL != module->shared_comm) {
ompi_comm_free (&module->shared_comm);
}
return global_result;
}
static int ompi_osc_rdma_create_groups (ompi_osc_rdma_module_t *module)
{
int comm_rank, ret, local_rank;
int values[2] = {0, 0};
/* create a shared communicator to handle communication about the local segment */
ret = ompi_comm_split_type (module->comm, MPI_COMM_TYPE_SHARED, 0, NULL, &module->shared_comm);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to create a shared memory communicator. error code %d", ret);
return ret;
}
local_rank = ompi_comm_rank (module->shared_comm);
comm_rank = ompi_comm_rank (module->comm);
ret = ompi_comm_split (module->comm, (0 == local_rank) ? 0 : MPI_UNDEFINED, comm_rank, &module->local_leaders,
false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to create local leaders communicator. error code %d", ret);
return ret;
}
if (0 == local_rank) {
values[0] = ompi_comm_size (module->local_leaders);
values[1] = ompi_comm_rank (module->local_leaders);
}
if (ompi_comm_size (module->shared_comm) > 1) {
ret = module->shared_comm->c_coll.coll_bcast (values, 2, MPI_INT, 0, module->shared_comm,
module->shared_comm->c_coll.coll_bcast_module);
if (OMPI_SUCCESS != ret) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to broadcast local data. error code %d", ret);
return ret;
}
}
module->node_count = values[0];
module->node_id = values[1];
return OMPI_SUCCESS;
}
/**
* @brief check the displacement unit and size against peers
*
* @param[in] module osc rdma module
* @param[in] disp_unit the displacement unit for this process
* @param[in] size the window size for this process
*
* This function checks if all ranks have the same displacement unit or size and sets the appropriate
* flags on the module.
*/
static int ompi_osc_rdma_check_parameters (ompi_osc_rdma_module_t *module, int disp_unit, size_t size)
{
long values[4];
int ret;
if (MPI_WIN_FLAVOR_DYNAMIC == module->flavor || (module->same_size && module->same_disp_unit)) {
/* done */
return OMPI_SUCCESS;
}
/* check displacements and sizes */
values[0] = disp_unit;
values[1] = -disp_unit;
values[2] = size;
values[3] = -(ssize_t) size;
ret = module->comm->c_coll.coll_allreduce (MPI_IN_PLACE, values, 4, MPI_LONG, MPI_MIN, module->comm,
module->comm->c_coll.coll_allreduce_module);
if (OMPI_SUCCESS != ret) {
return ret;
}
if (values[0] == -values[1]) {
/* same displacement */
module->same_disp_unit = true;
}
if (values[2] == -values[3]) {
/* same size */
module->same_size = true;
}
return OMPI_SUCCESS;
}
static int ompi_osc_rdma_component_select (struct ompi_win_t *win, void **base, size_t size, int disp_unit,
struct ompi_communicator_t *comm, struct ompi_info_t *info,
int flavor, int *model)
{
ompi_osc_rdma_module_t *module = NULL;
int world_size = ompi_comm_size (comm);
int init_limit = 256;
int ret;
char *name;
/* the osc/sm component is the exclusive provider for support for shared
* memory windows */
if (MPI_WIN_FLAVOR_SHARED == flavor) {
return OMPI_ERR_NOT_SUPPORTED;
}
/* create module structure with all fields initialized to zero */
module = (ompi_osc_rdma_module_t *) calloc (1, sizeof (ompi_osc_rdma_module_t));
if (NULL == module) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
/* initialize the objects, so that always free in cleanup */
OBJ_CONSTRUCT(&module->lock, opal_recursive_mutex_t);
OBJ_CONSTRUCT(&module->outstanding_locks, opal_hash_table_t);
OBJ_CONSTRUCT(&module->pending_posts, opal_list_t);
OBJ_CONSTRUCT(&module->peer_lock, opal_mutex_t);
OBJ_CONSTRUCT(&module->all_sync, ompi_osc_rdma_sync_t);
module->same_disp_unit = check_config_value_bool ("same_disp_unit", info);
module->same_size = check_config_value_bool ("same_size", info);
module->no_locks = check_config_value_bool ("no_locks", info);
module->all_sync.module = module;
module->flavor = flavor;
module->win = win;
module->disp_unit = disp_unit;
module->size = size;
/* set the module so we properly cleanup */
win->w_osc_module = (ompi_osc_base_module_t*) module;
if (!module->no_locks) {
if (world_size > init_limit) {
ret = opal_hash_table_init (&module->outstanding_locks, init_limit);
if (OPAL_SUCCESS != ret) {
ompi_osc_rdma_free (win);
return ret;
}
} else {
module->outstanding_lock_array = calloc (world_size, sizeof (module->outstanding_lock_array[0]));
if (NULL == module->outstanding_lock_array) {
ompi_osc_rdma_free (win);
return OMPI_ERR_OUT_OF_RESOURCE;
}
}
}
/* options */
/* FIX ME: should actually check this value... */
#if 1
module->accumulate_ordering = 1;
#else
ompi_osc_base_config_value_equal("accumulate_ordering", info, "none");
#endif
ret = ompi_comm_dup(comm, &module->comm);
if (OMPI_SUCCESS != ret) {
ompi_osc_rdma_free (win);
return ret;
}
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "creating osc/rdma window of flavor %d with id %d",
flavor, ompi_comm_get_cid(module->comm));
/* peer data */
if (world_size > init_limit) {
OBJ_CONSTRUCT(&module->peer_hash, opal_hash_table_t);
ret = opal_hash_table_init (&module->peer_hash, init_limit);
} else {
module->peer_array = calloc (world_size, sizeof (ompi_osc_rdma_peer_t *));
if (NULL == module->peer_array) {
ret = OMPI_ERR_OUT_OF_RESOURCE;
}
}
if (OPAL_SUCCESS != ret) {
ompi_osc_rdma_free (win);
return ret;
}
/* find rdma capable endpoints */
ret = ompi_osc_rdma_query_btls (module->comm, &module->selected_btl);
if (OMPI_SUCCESS != ret) {
ompi_osc_rdma_free (win);
return ret;
}
/* calculate and store various structure sizes */
module->region_size = module->selected_btl->btl_registration_handle_size + sizeof (ompi_osc_rdma_region_t);
module->state_size = sizeof (ompi_osc_rdma_state_t);
if (MPI_WIN_FLAVOR_DYNAMIC != module->flavor) {
module->state_size += module->region_size;
} else {
module->state_size += mca_osc_rdma_component.max_attach * module->region_size;
}
/* fill in the function pointer part */
memcpy(&module->super, &ompi_osc_rdma_module_rdma_template, sizeof(module->super));
ret = ompi_osc_rdma_check_parameters (module, disp_unit, size);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
ompi_osc_rdma_free (win);
return ret;
}
ret = ompi_osc_rdma_create_groups (module);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
ompi_osc_rdma_free (win);
return ret;
}
/* fill in our part */
ret = allocate_state_shared (module, base, size);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to allocate internal state");
ompi_osc_rdma_free (win);
return ret;
}
if (MPI_WIN_FLAVOR_DYNAMIC == flavor) {
/* allocate space to store local btl handles for attached regions */
module->dynamic_handles = (ompi_osc_rdma_handle_t *) calloc (mca_osc_rdma_component.max_attach,
sizeof (module->dynamic_handles[0]));
if (NULL == module->dynamic_handles) {
ompi_osc_rdma_free (win);
return OMPI_ERR_OUT_OF_RESOURCE;
}
}
ret = ompi_osc_rdma_share_data (module);
if (OMPI_SUCCESS != ret) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_ERROR, "failed to share window data with peers");
ompi_osc_rdma_free (win);
return ret;
}
/* for now the leader is always rank 0 in the communicator */
module->leader = ompi_osc_rdma_module_peer (module, 0);
/* lock data */
if (module->no_locks) {
win->w_flags |= OMPI_WIN_NO_LOCKS;
}
if (module->same_size) {
win->w_flags |= OMPI_WIN_SAME_SIZE;
}
if (module->same_disp_unit) {
win->w_flags |= OMPI_WIN_SAME_DISP;
}
/* update component data */
OPAL_THREAD_LOCK(&mca_osc_rdma_component.lock);
ret = opal_hash_table_set_value_uint32(&mca_osc_rdma_component.modules,
ompi_comm_get_cid(module->comm),
module);
OPAL_THREAD_UNLOCK(&mca_osc_rdma_component.lock);
if (OMPI_SUCCESS != ret) {
ompi_osc_rdma_free (win);
return ret;
}
/* fill in window information */
*model = MPI_WIN_UNIFIED;
win->w_osc_module = (ompi_osc_base_module_t*) module;
asprintf(&name, "rdma window %d", ompi_comm_get_cid(module->comm));
ompi_win_set_name(win, name);
free(name);
/* sync memory - make sure all initialization completed */
opal_atomic_mb();
/* barrier to prevent arrival of lock requests before we're
fully created */
ret = module->comm->c_coll.coll_barrier(module->comm,
module->comm->c_coll.coll_barrier_module);
if (OMPI_SUCCESS != ret) {
ompi_osc_rdma_free (win);
return ret;
}
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "finished creating osc/rdma window with id %d",
ompi_comm_get_cid(module->comm));
return OMPI_SUCCESS;
}
static int ompi_osc_rdma_set_info (struct ompi_win_t *win, struct ompi_info_t *info)
{
ompi_osc_rdma_module_t *module = GET_MODULE(win);
bool temp;
temp = check_config_value_bool ("no_locks", info);
if (temp && !module->no_locks) {
/* clean up the lock hash. it is up to the user to ensure no lock is
* outstanding from this process when setting the info key */
OBJ_DESTRUCT(&module->outstanding_locks);
OBJ_CONSTRUCT(&module->outstanding_locks, opal_hash_table_t);
module->no_locks = true;
win->w_flags |= OMPI_WIN_NO_LOCKS;
} else if (!temp && module->no_locks) {
int world_size = ompi_comm_size (module->comm);
int init_limit = world_size > 256 ? 256 : world_size;
int ret;
ret = opal_hash_table_init (&module->outstanding_locks, init_limit);
if (OPAL_SUCCESS != ret) {
return ret;
}
module->no_locks = false;
win->w_flags &= ~OMPI_WIN_NO_LOCKS;
}
/* enforce collectiveness... */
return module->comm->c_coll.coll_barrier(module->comm,
module->comm->c_coll.coll_barrier_module);
}
static int ompi_osc_rdma_get_info (struct ompi_win_t *win, struct ompi_info_t **info_used)
{
ompi_info_t *info = OBJ_NEW(ompi_info_t);
if (NULL == info) {
return OMPI_ERR_TEMP_OUT_OF_RESOURCE;
}
*info_used = info;
return OMPI_SUCCESS;
}
OBJ_CLASS_INSTANCE(ompi_osc_rdma_aggregation_t, opal_list_item_t, NULL, NULL);
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