int ompi_osc_rdma_flush (int target, struct ompi_win_t *win)
{
ompi_osc_rdma_module_t *module = GET_MODULE(win);
ompi_osc_rdma_sync_t *lock;
ompi_osc_rdma_peer_t *peer;
assert (0 <= target);
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_TRACE, "flush: %d, %s", target, win->w_name);
if (ompi_comm_rank (module->comm) == target) {
/* nothing to flush. call one round of progress */
ompi_osc_rdma_progress (module);
return OMPI_SUCCESS;
}
OPAL_THREAD_LOCK(&module->lock);
lock = ompi_osc_rdma_module_sync_lookup (module, target, &peer);
if (OPAL_UNLIKELY(NULL == lock || OMPI_OSC_RDMA_SYNC_TYPE_LOCK != lock->type)) {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_INFO, "flush: target %d is not locked in window %s",
target, win->w_name);
OPAL_THREAD_UNLOCK(&module->lock);
return OMPI_ERR_RMA_SYNC;
}
OPAL_THREAD_UNLOCK(&module->lock);
/* finish all outstanding fragments */
ompi_osc_rdma_sync_rdma_complete (lock);
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_TRACE, "flush on target %d complete", target);
return OMPI_SUCCESS;
}
/* locking via atomics */
static inline int ompi_osc_rdma_lock_atomic_internal (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer,
ompi_osc_rdma_sync_t *lock)
{
int ret;
if (MPI_LOCK_EXCLUSIVE == lock->sync.lock.type) {
do {
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "incrementing global exclusive lock");
/* lock the master lock. this requires no rank has a global shared lock */
ret = ompi_osc_rdma_lock_acquire_shared (module, module->leader, 1, offsetof (ompi_osc_rdma_state_t, global_lock), 0xffffffff00000000L);
if (OMPI_SUCCESS != ret) {
ompi_osc_rdma_progress (module);
continue;
}
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "acquiring exclusive lock on peer");
ret = ompi_osc_rdma_lock_try_acquire_exclusive (module, peer, offsetof (ompi_osc_rdma_state_t, local_lock));
if (ret) {
/* release the global lock */
ompi_osc_rdma_lock_release_shared (module, module->leader, -1, offsetof (ompi_osc_rdma_state_t, global_lock));
ompi_osc_rdma_progress (module);
continue;
}
peer->flags |= OMPI_OSC_RDMA_PEER_EXCLUSIVE;
break;
} while (1);
} else {
do {
/* go right to the target to acquire a shared lock */
OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "incrementing global shared lock");
ret = ompi_osc_rdma_lock_acquire_shared (module, peer, 1, offsetof (ompi_osc_rdma_state_t, local_lock),
OMPI_OSC_RDMA_LOCK_EXCLUSIVE);
if (OMPI_SUCCESS == ret) {
return OMPI_SUCCESS;
}
ompi_osc_rdma_progress (module);
} while (1);
}
return OMPI_SUCCESS;
}
int ompi_osc_rdma_sync (struct ompi_win_t *win)
{
ompi_osc_rdma_progress (GET_MODULE(win));
return OMPI_SUCCESS;
}
static inline int cas_rdma (ompi_osc_rdma_sync_t *sync, const void *source_buffer, const void *compare_buffer, void *result_buffer,
ompi_datatype_t *datatype, ompi_osc_rdma_peer_t *peer, uint64_t target_address,
mca_btl_base_registration_handle_t *target_handle)
{
ompi_osc_rdma_module_t *module = sync->module;
const size_t btl_alignment_mask = ALIGNMENT_MASK(module->selected_btl->btl_get_alignment);
unsigned long offset, aligned_len, len = datatype->super.size;
ompi_osc_rdma_frag_t *frag = NULL;
ompi_osc_rdma_request_t *request;
char *ptr = NULL;
int ret;
OMPI_OSC_RDMA_REQUEST_ALLOC(module, peer, request);
request->internal = true;
request->type = OMPI_OSC_RDMA_TYPE_CSWAP;
request->sync = sync;
OPAL_THREAD_LOCK(&module->lock);
/* to ensure order wait until the previous accumulate completes */
while (ompi_osc_rdma_peer_is_accumulating (peer)) {
OPAL_THREAD_UNLOCK(&module->lock);
ompi_osc_rdma_progress (module);
OPAL_THREAD_LOCK(&module->lock);
}
peer->flags |= OMPI_OSC_RDMA_PEER_ACCUMULATING;
OPAL_THREAD_UNLOCK(&module->lock);
offset = target_address & btl_alignment_mask;;
aligned_len = (len + offset + btl_alignment_mask) & ~btl_alignment_mask;
ret = ompi_osc_rdma_frag_alloc (module, aligned_len, &frag, &ptr);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
peer->flags &= ~OMPI_OSC_RDMA_PEER_ACCUMULATING;
OPAL_OUTPUT_VERBOSE((10, ompi_osc_base_framework.framework_output,
"Could not allocate an rdma fragment for get accumulate. Falling back on point-to-point"));
return OMPI_ERR_OUT_OF_RESOURCE;
}
if (!ompi_osc_rdma_peer_is_exclusive (peer)) {
(void) ompi_osc_rdma_lock_acquire_exclusive (module, peer, offsetof (ompi_osc_rdma_state_t, accumulate_lock));
}
/* set up the request */
request->frag = frag;
request->origin_addr = (void *) source_buffer;
request->ctx = (void *) target_handle;
request->result_addr = result_buffer;
request->compare_addr = compare_buffer;
request->result_dt = datatype;
request->offset = (ptrdiff_t) offset;
request->target_address = target_address;
request->len = len;
OPAL_OUTPUT_VERBOSE((60, ompi_osc_base_framework.framework_output, "initiating btl get..."));
ret = module->selected_btl->btl_get (module->selected_btl, peer->data_endpoint, ptr,
target_address, frag->handle, target_handle,
aligned_len, 0, MCA_BTL_NO_ORDER,
ompi_osc_rdma_cas_get_complete, request, NULL);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
ompi_osc_rdma_frag_complete (frag);
return ret;
}
ompi_osc_rdma_sync_rdma_inc (sync);
return OMPI_SUCCESS;
}
static inline int ompi_osc_rdma_gacc_master (ompi_osc_rdma_sync_t *sync, const void *source_buffer, int source_count,
ompi_datatype_t *source_datatype, void *result_buffer, int result_count,
ompi_datatype_t *result_datatype, ompi_osc_rdma_peer_t *peer, uint64_t target_address,
mca_btl_base_registration_handle_t *target_handle, int target_count,
ompi_datatype_t *target_datatype, ompi_op_t *op, ompi_osc_rdma_request_t *request)
{
ompi_osc_rdma_module_t *module = sync->module;
struct iovec source_iovec[OMPI_OSC_RDMA_DECODE_MAX], target_iovec[OMPI_OSC_RDMA_DECODE_MAX];
const size_t acc_limit = (mca_osc_rdma_component.buffer_size >> 3);
uint32_t source_primitive_count, target_primitive_count;
opal_convertor_t source_convertor, target_convertor;
uint32_t source_iov_count, target_iov_count;
uint32_t source_iov_index, target_iov_index;
ompi_datatype_t *source_primitive, *target_primitive;
/* needed for opal_convertor_raw but not used */
size_t source_size, target_size;
ompi_osc_rdma_request_t *subreq;
size_t result_position;
ptrdiff_t lb, extent;
int ret, acc_len;
bool done;
(void) ompi_datatype_get_extent (target_datatype, &lb, &extent);
target_address += lb;
/* fast path for accumulate on built-in types */
if (OPAL_LIKELY((!source_count || ompi_datatype_is_predefined (source_datatype)) &&
ompi_datatype_is_predefined (target_datatype) &&
(!result_count || ompi_datatype_is_predefined (result_datatype)) &&
(target_datatype->super.size * target_count <= acc_limit))) {
if (NULL == request) {
OMPI_OSC_RDMA_REQUEST_ALLOC(module, peer, request);
request->internal = true;
request->type = result_datatype ? OMPI_OSC_RDMA_TYPE_GET_ACC : OMPI_OSC_RDMA_TYPE_ACC;
}
if (source_datatype) {
(void) ompi_datatype_get_extent (source_datatype, &lb, &extent);
source_buffer = (void *)((intptr_t) source_buffer + lb);
}
if (result_datatype) {
(void) ompi_datatype_get_extent (result_datatype, &lb, &extent);
result_buffer = (void *)((intptr_t) result_buffer + lb);
}
ret = ompi_osc_rdma_gacc_contig (sync, source_buffer, source_count, source_datatype, result_buffer,
result_count, result_datatype, peer, target_address,
target_handle, target_count, target_datatype, op,
request);
if (OPAL_LIKELY(OMPI_SUCCESS == ret)) {
return OMPI_SUCCESS;
}
if (source_datatype) {
/* the convertors will handle the lb */
(void) ompi_datatype_get_extent (source_datatype, &lb, &extent);
source_buffer = (void *)((intptr_t) source_buffer - lb);
}
if (result_datatype) {
(void) ompi_datatype_get_extent (result_datatype, &lb, &extent);
result_buffer = (void *)((intptr_t) result_buffer - lb);
}
}
/* the convertor will handle lb from here */
(void) ompi_datatype_get_extent (target_datatype, &lb, &extent);
target_address -= lb;
/* get the primitive datatype info */
ret = ompi_osc_base_get_primitive_type_info (target_datatype, &target_primitive, &target_primitive_count);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
/* target datatype is not made up of a single basic datatype */
return ret;
}
if (source_datatype) {
ret = ompi_osc_base_get_primitive_type_info (source_datatype, &source_primitive, &source_primitive_count);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
/* target datatype is not made up of a single basic datatype */
return ret;
}
if (OPAL_UNLIKELY(source_primitive != target_primitive)) {
return MPI_ERR_TYPE;
}
}
/* prepare convertors for the source and target. these convertors will be used to determine the
* contiguous segments within the source and target. */
/* the source may be NULL if using MPI_OP_NO_OP with MPI_Get_accumulate */
if (source_datatype) {
OBJ_CONSTRUCT(&source_convertor, opal_convertor_t);
ret = opal_convertor_copy_and_prepare_for_send (ompi_mpi_local_convertor, &source_datatype->super, source_count, source_buffer,
0, &source_convertor);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
return ret;
}
}
/* target_datatype can never be NULL */
OBJ_CONSTRUCT(&target_convertor, opal_convertor_t);
ret = opal_convertor_copy_and_prepare_for_send (ompi_mpi_local_convertor, &target_datatype->super, target_count,
(void *) (intptr_t) target_address, 0, &target_convertor);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
return ret;
}
if (request) {
/* keep the request from completing until all the transfers have started */
request->outstanding_requests = 1;
}
target_iov_index = 0;
target_iov_count = 0;
result_position = 0;
do {
/* decode segments of the source data */
source_iov_count = OMPI_OSC_RDMA_DECODE_MAX;
source_iov_index = 0;
/* opal_convertor_raw returns done when it has reached the end of the data */
if (!source_datatype) {
done = true;
source_iovec[0].iov_len = (size_t) -1;
source_iovec[0].iov_base = NULL;
source_iov_count = 1;
} else {
done = opal_convertor_raw (&source_convertor, source_iovec, &source_iov_count, &source_size);
}
/* loop on the target segments until we have exhaused the decoded source data */
while (source_iov_index != source_iov_count) {
if (target_iov_index == target_iov_count) {
/* decode segments of the target buffer */
target_iov_count = OMPI_OSC_RDMA_DECODE_MAX;
target_iov_index = 0;
(void) opal_convertor_raw (&target_convertor, target_iovec, &target_iov_count, &target_size);
}
/* we already checked that the target was large enough. this should be impossible */
assert (0 != target_iov_count);
/* determine how much to put in this operation */
acc_len = min(target_iovec[target_iov_index].iov_len, source_iovec[source_iov_index].iov_len);
acc_len = min((size_t) acc_len, acc_limit);
/* execute the get */
OMPI_OSC_RDMA_REQUEST_ALLOC(module, peer, subreq);
subreq->internal = true;
subreq->parent_request = request;
if (request) {
(void) OPAL_THREAD_ADD32 (&request->outstanding_requests, 1);
}
if (result_datatype) {
/* prepare a convertor for this part of the result */
opal_convertor_copy_and_prepare_for_recv (ompi_mpi_local_convertor, &result_datatype->super, result_count,
result_buffer, 0, &subreq->convertor);
opal_convertor_set_position (&subreq->convertor, &result_position);
subreq->type = OMPI_OSC_RDMA_TYPE_GET_ACC;
} else {
subreq->type = OMPI_OSC_RDMA_TYPE_ACC;
}
OPAL_OUTPUT_VERBOSE((60, ompi_osc_base_framework.framework_output,
"target index = %d, target = {%p, %lu}, source_index = %d, source = {%p, %lu}, result = %p, result position = %lu, "
"acc_len = %d, count = %lu",
target_iov_index, target_iovec[target_iov_index].iov_base, (unsigned long) target_iovec[target_iov_index].iov_len,
source_iov_index, source_iovec[source_iov_index].iov_base, (unsigned long) source_iovec[source_iov_index].iov_len,
result_buffer, (unsigned long) result_position, acc_len, (unsigned long)(acc_len / target_primitive->super.size)));
ret = ompi_osc_rdma_gacc_contig (sync, source_iovec[source_iov_index].iov_base, acc_len / target_primitive->super.size,
target_primitive, NULL, 0, NULL, peer, (uint64_t) (intptr_t) target_iovec[target_iov_index].iov_base,
target_handle, acc_len / target_primitive->super.size, target_primitive, op, subreq);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
if (OPAL_UNLIKELY(OMPI_ERR_OUT_OF_RESOURCE != ret)) {
/* something bad happened. need to figure out how to handle these errors */
return ret;
}
/* progress and try again */
ompi_osc_rdma_progress (module);
continue;
}
/* adjust io vectors */
target_iovec[target_iov_index].iov_len -= acc_len;
source_iovec[source_iov_index].iov_len -= acc_len;
target_iovec[target_iov_index].iov_base = (void *)((intptr_t) target_iovec[target_iov_index].iov_base + acc_len);
source_iovec[source_iov_index].iov_base = (void *)((intptr_t) source_iovec[source_iov_index].iov_base + acc_len);
result_position += acc_len;
source_iov_index += !source_datatype || (0 == source_iovec[source_iov_index].iov_len);
target_iov_index += (0 == target_iovec[target_iov_index].iov_len);
}
} while (!done);
if (request) {
/* release our reference so the request can complete */
(void) OPAL_THREAD_ADD32 (&request->outstanding_requests, -1);
}
if (source_datatype) {
opal_convertor_cleanup (&source_convertor);
OBJ_DESTRUCT(&source_convertor);
}
opal_convertor_cleanup (&target_convertor);
OBJ_DESTRUCT(&target_convertor);
return OMPI_SUCCESS;
}
static inline int ompi_osc_rdma_gacc_contig (ompi_osc_rdma_sync_t *sync, const void *source, int source_count, ompi_datatype_t *source_datatype,
void *result, int result_count, ompi_datatype_t *result_datatype,
ompi_osc_rdma_peer_t *peer, uint64_t target_address,
mca_btl_base_registration_handle_t *target_handle, int target_count,
ompi_datatype_t *target_datatype, ompi_op_t *op, ompi_osc_rdma_request_t *request)
{
ompi_osc_rdma_module_t *module = sync->module;
const size_t btl_alignment_mask = ALIGNMENT_MASK(module->selected_btl->btl_get_alignment);
unsigned long len = target_count * target_datatype->super.size;
ompi_osc_rdma_frag_t *frag = NULL;
unsigned long aligned_len, offset;
char *ptr = NULL;
int ret;
offset = target_address & btl_alignment_mask;;
aligned_len = (len + offset + btl_alignment_mask) & ~btl_alignment_mask;
ret = ompi_osc_rdma_frag_alloc (module, aligned_len, &frag, &ptr);
if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
OPAL_OUTPUT_VERBOSE((10, ompi_osc_base_framework.framework_output,
"Could not allocate an rdma fragment for get accumulate"));
return OMPI_ERR_OUT_OF_RESOURCE;
}
OPAL_THREAD_LOCK(&module->lock);
/* to ensure order wait until the previous accumulate completes */
while (ompi_osc_rdma_peer_is_accumulating (peer)) {
OPAL_THREAD_UNLOCK(&module->lock);
ompi_osc_rdma_progress (module);
OPAL_THREAD_LOCK(&module->lock);
}
peer->flags |= OMPI_OSC_RDMA_PEER_ACCUMULATING;
OPAL_THREAD_UNLOCK(&module->lock);
if (!ompi_osc_rdma_peer_is_exclusive (peer)) {
(void) ompi_osc_rdma_lock_acquire_exclusive (module, peer, offsetof (ompi_osc_rdma_state_t, accumulate_lock));
}
/* set up the request */
request->frag = frag;
request->origin_addr = (void *) source;
request->origin_dt = source_datatype;
request->origin_count = source_count;
request->ctx = (void *) target_handle;
request->result_addr = result;
request->result_count = result_count;
request->result_dt = result_datatype;
request->offset = (ptrdiff_t) target_address & btl_alignment_mask;
request->target_address = target_address;
request->len = len;
request->op = op;
request->sync = sync;
ompi_osc_rdma_sync_rdma_inc (sync);
if (&ompi_mpi_op_replace.op != op || result) {
/* align the target address */
target_address = target_address & ~btl_alignment_mask;
OPAL_OUTPUT_VERBOSE((60, ompi_osc_base_framework.framework_output,
"initiating btl get local: {%p, %p}, remote: {0x%" PRIx64 ", %p}...",
ptr, (void *) frag->handle, target_address, (void *) target_handle));
ret = module->selected_btl->btl_get (module->selected_btl, peer->data_endpoint, ptr,
target_address, frag->handle, target_handle, aligned_len,
0, MCA_BTL_NO_ORDER, ompi_osc_rdma_acc_get_complete,
request, NULL);
} else {
/* copy the put accumulate data */
memcpy (ptr, source, len);
OPAL_OUTPUT_VERBOSE((60, ompi_osc_base_framework.framework_output,
"initiating btl put..."));
ret = module->selected_btl->btl_put (module->selected_btl, peer->data_endpoint, ptr,
target_address, frag->handle, target_handle, len, 0,
MCA_BTL_NO_ORDER, ompi_osc_rdma_acc_put_complete,
request, NULL);
}
if (OPAL_UNLIKELY(OMPI_SUCCESS == ret)) {
return OMPI_SUCCESS;
}
OPAL_OUTPUT_VERBOSE((20, ompi_osc_base_framework.framework_output, "btl operation failed with ret = %d", ret));
ompi_osc_rdma_cleanup_rdma (sync, frag, NULL, NULL);
return ret;
}