117 строки
4.3 KiB
C
117 строки
4.3 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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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) 2004-2006 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 (c) 2014-2015 Los Alamos National Security, LLC. All rights
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* 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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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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#include "ompi_config.h"
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#include "ompi/constants.h"
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#include "ompi/mca/pml/pml.h"
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#include "ompi/mca/bml/bml.h"
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#include "opal/mca/mpool/mpool.h"
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#include "pml_ob1.h"
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#include "pml_ob1_rdma.h"
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/*
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* Check to see if memory is registered or can be registered. Build a
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* set of registrations on the request.
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*/
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size_t mca_pml_ob1_rdma_btls(
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mca_bml_base_endpoint_t* bml_endpoint,
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unsigned char* base,
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size_t size,
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mca_pml_ob1_com_btl_t* rdma_btls)
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{
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int num_btls = mca_bml_base_btl_array_get_size(&bml_endpoint->btl_rdma);
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double weight_total = 0;
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int num_btls_used = 0;
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/* shortcut when there are no rdma capable btls */
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if(num_btls == 0) {
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return 0;
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}
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/* check to see if memory is registered */
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for (int n = 0; n < num_btls && num_btls_used < mca_pml_ob1.max_rdma_per_request; n++) {
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mca_bml_base_btl_t* bml_btl =
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mca_bml_base_btl_array_get_index(&bml_endpoint->btl_rdma,
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(bml_endpoint->btl_rdma_index + n) % num_btls);
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mca_btl_base_registration_handle_t *reg_handle = NULL;
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mca_btl_base_module_t *btl = bml_btl->btl;
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if (btl->btl_register_mem) {
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/* do not use the RDMA protocol with this btl if 1) leave pinned is disabled,
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* 2) the btl supports put, and 3) the fragment is larger than the minimum
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* pipeline size specified by the BTL */
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if (!mca_pml_ob1.leave_pinned && (btl->btl_flags & MCA_BTL_FLAGS_PUT) &&
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size > btl->btl_min_rdma_pipeline_size) {
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continue;
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}
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/* try to register the memory region with the btl */
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reg_handle = btl->btl_register_mem (btl, bml_btl->btl_endpoint, base,
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size, MCA_BTL_REG_FLAG_REMOTE_READ);
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if (NULL == reg_handle) {
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/* btl requires registration but the registration failed */
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continue;
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}
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} /* else no registration is needed with this btl */
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rdma_btls[num_btls_used].bml_btl = bml_btl;
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rdma_btls[num_btls_used].btl_reg = reg_handle;
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weight_total += bml_btl->btl_weight;
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num_btls_used++;
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}
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/* if we don't use leave_pinned and all BTLs that already have this memory
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* registered amount to less then half of available bandwidth - fall back to
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* pipeline protocol */
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if (0 == num_btls_used || (!mca_pml_ob1.leave_pinned && weight_total < 0.5))
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return 0;
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mca_pml_ob1_calc_weighted_length(rdma_btls, num_btls_used, size,
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weight_total);
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bml_endpoint->btl_rdma_index = (bml_endpoint->btl_rdma_index + 1) % num_btls;
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return num_btls_used;
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}
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size_t mca_pml_ob1_rdma_pipeline_btls( mca_bml_base_endpoint_t* bml_endpoint,
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size_t size,
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mca_pml_ob1_com_btl_t* rdma_btls )
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{
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int i, num_btls = mca_bml_base_btl_array_get_size(&bml_endpoint->btl_rdma);
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double weight_total = 0;
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for(i = 0; i < num_btls && i < mca_pml_ob1.max_rdma_per_request; i++) {
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rdma_btls[i].bml_btl =
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mca_bml_base_btl_array_get_next(&bml_endpoint->btl_rdma);
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rdma_btls[i].btl_reg = NULL;
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weight_total += rdma_btls[i].bml_btl->btl_weight;
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}
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mca_pml_ob1_calc_weighted_length(rdma_btls, i, size, weight_total);
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return i;
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}
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