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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 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 (c) 2014-2017 Los Alamos National Security, LLC. All rights
* reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#include "ompi_config.h"
#include "ompi/constants.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/bml/bml.h"
#include "opal/mca/mpool/mpool.h"
#include "opal/runtime/opal_params.h"
#include "pml_ob1.h"
#include "pml_ob1_rdma.h"
/*
* Check to see if memory is registered or can be registered. Build a
* set of registrations on the request.
*/
size_t mca_pml_ob1_rdma_btls(
mca_bml_base_endpoint_t* bml_endpoint,
unsigned char* base,
size_t size,
mca_pml_ob1_com_btl_t* rdma_btls)
{
int num_btls = mca_bml_base_btl_array_get_size(&bml_endpoint->btl_rdma);
int num_eager_btls = mca_bml_base_btl_array_get_size (&bml_endpoint->btl_eager);
double weight_total = 0;
int num_btls_used = 0;
/* shortcut when there are no rdma capable btls */
if(num_btls == 0) {
return 0;
}
/* check to see if memory is registered */
for (int n = 0; n < num_btls && num_btls_used < mca_pml_ob1.max_rdma_per_request; n++) {
mca_bml_base_btl_t* bml_btl =
mca_bml_base_btl_array_get_index(&bml_endpoint->btl_rdma,
(bml_endpoint->btl_rdma_index + n) % num_btls);
mca_btl_base_registration_handle_t *reg_handle = NULL;
mca_btl_base_module_t *btl = bml_btl->btl;
/* NTH: go ahead and use an rdma btl if is the only one */
bool ignore = !mca_pml_ob1.use_all_rdma;
/* do not use rdma btls that are not in the eager list. this is necessary to avoid using
* btls that exist on the endpoint only to support RMA. */
for (int i = 0 ; i < num_eager_btls && ignore ; ++i) {
mca_bml_base_btl_t *eager_btl = mca_bml_base_btl_array_get_index (&bml_endpoint->btl_eager, i);
if (eager_btl->btl_endpoint == bml_btl->btl_endpoint) {
ignore = false;
break;
}
}
if (ignore) {
continue;
}
if (btl->btl_register_mem) {
/* do not use the RDMA protocol with this btl if 1) leave pinned is disabled,
* 2) the btl supports put, and 3) the fragment is larger than the minimum
* pipeline size specified by the BTL */
if (!opal_leave_pinned && (btl->btl_flags & MCA_BTL_FLAGS_PUT) &&
size > btl->btl_min_rdma_pipeline_size) {
continue;
}
/* try to register the memory region with the btl */
reg_handle = btl->btl_register_mem (btl, bml_btl->btl_endpoint, base,
size, MCA_BTL_REG_FLAG_REMOTE_READ);
if (NULL == reg_handle) {
/* btl requires registration but the registration failed */
continue;
}
} /* else no registration is needed with this btl */
rdma_btls[num_btls_used].bml_btl = bml_btl;
rdma_btls[num_btls_used].btl_reg = reg_handle;
weight_total += bml_btl->btl_weight;
num_btls_used++;
}
/* if we don't use leave_pinned and all BTLs that already have this memory
* registered amount to less then half of available bandwidth - fall back to
* pipeline protocol */
if (0 == num_btls_used || (!opal_leave_pinned && weight_total < 0.5))
return 0;
mca_pml_ob1_calc_weighted_length(rdma_btls, num_btls_used, size,
weight_total);
bml_endpoint->btl_rdma_index = (bml_endpoint->btl_rdma_index + 1) % num_btls;
return num_btls_used;
}
size_t mca_pml_ob1_rdma_pipeline_btls_count (mca_bml_base_endpoint_t* bml_endpoint)
{
int num_btls = mca_bml_base_btl_array_get_size (&bml_endpoint->btl_rdma);
int num_eager_btls = mca_bml_base_btl_array_get_size (&bml_endpoint->btl_eager);
int rdma_count = 0;
for(int i = 0; i < num_btls && i < mca_pml_ob1.max_rdma_per_request; ++i) {
mca_bml_base_btl_t *bml_btl = mca_bml_base_btl_array_get_next(&bml_endpoint->btl_rdma);
/* NTH: go ahead and use an rdma btl if is the only one */
bool ignore = !mca_pml_ob1.use_all_rdma;
for (int j = 0 ; j < num_eager_btls && ignore ; ++j) {
mca_bml_base_btl_t *eager_btl = mca_bml_base_btl_array_get_index (&bml_endpoint->btl_eager, j);
if (eager_btl->btl_endpoint == bml_btl->btl_endpoint) {
ignore = false;
break;
}
}
if (!ignore) {
++rdma_count;
}
}
return rdma_count;
}
size_t mca_pml_ob1_rdma_pipeline_btls( mca_bml_base_endpoint_t* bml_endpoint,
size_t size,
mca_pml_ob1_com_btl_t* rdma_btls )
{
int num_btls = mca_bml_base_btl_array_get_size (&bml_endpoint->btl_rdma);
int num_eager_btls = mca_bml_base_btl_array_get_size (&bml_endpoint->btl_eager);
double weight_total = 0;
int rdma_count = 0;
for(int i = 0; i < num_btls && i < mca_pml_ob1.max_rdma_per_request; i++) {
mca_bml_base_btl_t *bml_btl = mca_bml_base_btl_array_get_next(&bml_endpoint->btl_rdma);
/* NTH: go ahead and use an rdma btl if is the only one */
bool ignore = !mca_pml_ob1.use_all_rdma;
for (int j = 0 ; j < num_eager_btls && ignore ; ++j) {
mca_bml_base_btl_t *eager_btl = mca_bml_base_btl_array_get_index (&bml_endpoint->btl_eager, j);
if (eager_btl->btl_endpoint == bml_btl->btl_endpoint) {
ignore = false;
break;
}
}
if (ignore) {
continue;
}
rdma_btls[rdma_count].bml_btl = bml_btl;
rdma_btls[rdma_count++].btl_reg = NULL;
weight_total += bml_btl->btl_weight;
}
mca_pml_ob1_calc_weighted_length (rdma_btls, rdma_count, size, weight_total);
return rdma_count;
}
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