552c9ca5a0
WHAT: Open our low-level communication infrastructure by moving all necessary components (btl/rcache/allocator/mpool) down in OPAL All the components required for inter-process communications are currently deeply integrated in the OMPI layer. Several groups/institutions have express interest in having a more generic communication infrastructure, without all the OMPI layer dependencies. This communication layer should be made available at a different software level, available to all layers in the Open MPI software stack. As an example, our ORTE layer could replace the current OOB and instead use the BTL directly, gaining access to more reactive network interfaces than TCP. Similarly, external software libraries could take advantage of our highly optimized AM (active message) communication layer for their own purpose. UTK with support from Sandia, developped a version of Open MPI where the entire communication infrastucture has been moved down to OPAL (btl/rcache/allocator/mpool). Most of the moved components have been updated to match the new schema, with few exceptions (mainly BTLs where I have no way of compiling/testing them). Thus, the completion of this RFC is tied to being able to completing this move for all BTLs. For this we need help from the rest of the Open MPI community, especially those supporting some of the BTLs. A non-exhaustive list of BTLs that qualify here is: mx, portals4, scif, udapl, ugni, usnic. This commit was SVN r32317.
117 строки
3.4 KiB
C
117 строки
3.4 KiB
C
/*
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* Copyright (c) 2004-2007 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) 2004-2011 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) 2006-2012 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2006-2009 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2006-2012 Los Alamos National Security, LLC. All rights
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* reserved.
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* Copyright (c) 2006-2007 Voltaire All rights reserved.
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* Copyright (c) 2009-2012 Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011 NVIDIA Corporation. All rights reserved.
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* Copyright (c) 2012 Oak Ridge National Laboratory. All rights reserved
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*
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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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#include "opal_config.h"
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#include "opal/constants.h"
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#include <infiniband/verbs.h>
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#include "common_verbs.h"
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int opal_common_verbs_port_bw(struct ibv_port_attr *port_attr,
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uint32_t *bandwidth)
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{
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*bandwidth = 0;
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/* To calculate the bandwidth available on this port, we have to
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look up the values corresponding to port->active_speed and
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port->active_width. These are enums corresponding to the IB
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spec. Overall forumula to get the true link speed is 8/10 or
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64/66 of the reported speed (depends on the coding that is
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being used for the particular speed) times the number of
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links. */
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switch (port_attr->active_speed) {
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case 1:
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/* SDR: 2.5 Gbps * 0.8, in megabits */
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*bandwidth = 2000;
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break;
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case 2:
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/* DDR: 5 Gbps * 0.8, in megabits */
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*bandwidth = 4000;
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break;
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case 4:
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/* QDR: 10 Gbps * 0.8, in megabits */
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*bandwidth = 8000;
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break;
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case 8:
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/* FDR10: 10.3125 Gbps * 64/66, in megabits */
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*bandwidth = 10000;
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break;
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case 16:
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/* FDR: 14.0625 Gbps * 64/66, in megabits */
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*bandwidth = 13636;
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break;
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case 32:
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/* EDR: 25.78125 Gbps * 64/66, in megabits */
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*bandwidth = 25000;
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break;
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default:
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/* Who knows? */
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return OPAL_ERR_NOT_FOUND;
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}
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switch (port_attr->active_width) {
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case 1:
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/* 1x */
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/* unity */
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break;
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case 2:
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/* 4x */
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*bandwidth *= 4;
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break;
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case 4:
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/* 8x */
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*bandwidth *= 8;
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break;
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case 8:
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/* 12x */
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*bandwidth *= 12;
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break;
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default:
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/* Who knows? */
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return OPAL_ERR_NOT_FOUND;
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}
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return OPAL_SUCCESS;
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}
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int opal_common_verbs_mtu(struct ibv_port_attr *port_attr)
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{
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if (NULL == port_attr) {
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return 0;
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}
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switch(port_attr->active_mtu) {
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case IBV_MTU_256: return 256;
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case IBV_MTU_512: return 512;
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case IBV_MTU_1024: return 1024;
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case IBV_MTU_2048: return 2048;
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case IBV_MTU_4096: return 4096;
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default: return 0;
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}
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}
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