aec5cd08bd
WHAT: Merge the PMIx branch into the devel repo, creating a new
OPAL “lmix” framework to abstract PMI support for all RTEs.
Replace the ORTE daemon-level collectives with a new PMIx
server and update the ORTE grpcomm framework to support
server-to-server collectives
WHY: We’ve had problems dealing with variations in PMI implementations,
and need to extend the existing PMI definitions to meet exascale
requirements.
WHEN: Mon, Aug 25
WHERE: https://github.com/rhc54/ompi-svn-mirror.git
Several community members have been working on a refactoring of the current PMI support within OMPI. Although the APIs are common, Slurm and Cray implement a different range of capabilities, and package them differently. For example, Cray provides an integrated PMI-1/2 library, while Slurm separates the two and requires the user to specify the one to be used at runtime. In addition, several bugs in the Slurm implementations have caused problems requiring extra coding.
All this has led to a slew of #if’s in the PMI code and bugs when the corner-case logic for one implementation accidentally traps the other. Extending this support to other implementations would have increased this complexity to an unacceptable level.
Accordingly, we have:
* created a new OPAL “pmix” framework to abstract the PMI support, with separate components for Cray, Slurm PMI-1, and Slurm PMI-2 implementations.
* Replaced the current ORTE grpcomm daemon-based collective operation with an integrated PMIx server, and updated the grpcomm APIs to provide more flexible, multi-algorithm support for collective operations. At this time, only the xcast and allgather operations are supported.
* Replaced the current global collective id with a signature based on the names of the participating procs. The allows an unlimited number of collectives to be executed by any group of processes, subject to the requirement that only one collective can be active at a time for a unique combination of procs. Note that a proc can be involved in any number of simultaneous collectives - it is the specific combination of procs that is subject to the constraint
* removed the prior OMPI/OPAL modex code
* added new macros for executing modex send/recv to simplify use of the new APIs. The send macros allow the caller to specify whether or not the BTL supports async modex operations - if so, then the non-blocking “fence” operation is used, if the active PMIx component supports it. Otherwise, the default is a full blocking modex exchange as we currently perform.
* retained the current flag that directs us to use a blocking fence operation, but only to retrieve data upon demand
This commit was SVN r32570.
130 строки
3.8 KiB
C
130 строки
3.8 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) 2004-2007 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) 2008 Sun Microsystems, Inc. All rights reserved.
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* Copyright (c) 2010-2012 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2014 Intel, Inc. All rights 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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/** @file **/
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#ifndef OPAL_H
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#define OPAL_H
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#include "opal_config.h"
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#include "opal/types.h"
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BEGIN_C_DECLS
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/** version string of opal */
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OPAL_DECLSPEC extern const char opal_version_string[];
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/* Size of a cache line. Initialized to a fixed value (see
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opal_init.c) until hwloc data is available, at which time it is
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filled with the smallest size of the lowest cache line (e.g., the
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smallest line size from all L2 caches found on the current system).
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If the hwloc data is available, opal_cache_line_size will be set to
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its final value by the end of orte_init(). */
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OPAL_DECLSPEC extern int opal_cache_line_size;
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/** Do we want to be warned on fork or not? */
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OPAL_DECLSPEC extern bool opal_warn_on_fork;
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/**
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* Initialize the OPAL layer, including the MCA system.
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*
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* @retval OPAL_SUCCESS Upon success.
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* @retval OPAL_ERROR Upon failure.
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*
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* \note If this function is called, opal_init_util() should *not* be
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* called.
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*/
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OPAL_DECLSPEC int opal_init(int* pargc, char*** pargv);
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/**
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* Finalize the OPAL layer, including the MCA system.
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*
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* @retval OPAL_SUCCESS Upon success.
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* @retval OPAL_ERROR Upon failure.
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*
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* \note If this function is called, opal_finalize_util() should *not*
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* be called.
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*/
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OPAL_DECLSPEC int opal_finalize(void);
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/**
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* Initialize the OPAL layer, excluding the MCA system.
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*
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* @retval OPAL_SUCCESS Upon success.
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* @retval OPAL_ERROR Upon failure.
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*
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* \note If this function is called, opal_init() should *not*
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* be called.
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*/
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OPAL_DECLSPEC int opal_init_util(int* pargc, char*** pargv);
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/**
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* Finalize the OPAL layer, excluding the MCA system.
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*
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* @retval OPAL_SUCCESS Upon success.
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* @retval OPAL_ERROR Upon failure.
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*
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* \note If this function is called, opal_finalize() should *not*
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* be called.
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*/
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OPAL_DECLSPEC int opal_finalize_util(void);
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/**
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* Initialize a very thin OPAL layer solely for use
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* by unit tests. The purpose of this function is to
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* provide the absolute bare minimum support required
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* to open, select, and close a framework. This is
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* maintained separately from the other OPAL runtime
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* APIs to avoid conflicts when new frameworks are
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* added to the normal OPAL init sequence. It has no
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* other purpose and should not be used outside of
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* unit tests.
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*
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* @retval OPAL_SUCCESS Upon success.
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* @retval OPAL_ERROR Upon failure.
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*/
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OPAL_DECLSPEC int opal_init_test(void);
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/**
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* Finalize the very thin OPAL layer used solely
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* by unit tests. The purpose of this function is to
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* finalize the absolute bare minimum support opened
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* by its companion opal_init_test API. It has no
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* other purpose and should not be used outside of
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* unit tests.
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*
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* @retval OPAL_SUCCESS Upon success.
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* @retval OPAL_ERROR Upon failure.
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*/
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OPAL_DECLSPEC void opal_finalize_test(void);
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OPAL_DECLSPEC void opal_warn_fork(void);
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/**
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* Internal function. Do not call.
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*/
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OPAL_DECLSPEC int opal_register_params(void);
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OPAL_DECLSPEC int opal_deregister_params(void);
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END_C_DECLS
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#endif
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