/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 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) 2006      Cisco Systems, Inc.  All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#include "orte_config.h"
#include "orte/orte_constants.h"

#include "opal/mca/mca.h"
#include "opal/mca/base/base.h"
#include "opal/mca/base/mca_base_param.h"
#include "opal/util/output.h"

#include "orte/mca/rmaps/base/rmaps_private.h"
#include "orte/mca/rmaps/base/base.h"


/*
 * The following file was created by configure.  It contains extern
 * statements and the definition of an array of pointers to each
 * component's public mca_base_component_t struct.
 */

#include "orte/mca/rmaps/base/static-components.h"


/*
 * Global variables
 */
orte_rmaps_base_t orte_rmaps_base;

/*
 * Declare the RMAPS module to hold the API function pointers
 */
orte_rmaps_base_module_t orte_rmaps = {
    orte_rmaps_base_map,
    orte_rmaps_base_finalize
};

orte_rmaps_base_module_t orte_rmaps_no_op = {
    orte_rmaps_base_map_no_op,
    orte_rmaps_base_finalize
};

/**
 * Function for finding and opening either all MCA components, or the one
 * that was specifically requested via a MCA parameter.
 */
int orte_rmaps_base_open(void)
{
    int param, value;
    char *policy, *requested;

    /* Debugging / verbose output */

    param = mca_base_param_reg_int_name("rmaps", "base_verbose",
                                        "Verbosity level for the rmaps framework",
                                        false, false, 0, &value);
    if (value != 0) {
        orte_rmaps_base.rmaps_output = opal_output_open(NULL);
    } else {
        orte_rmaps_base.rmaps_output = -1;
    }

    /* Are we scheduling by node or by slot? */

    param = mca_base_param_reg_string_name("rmaps", "base_schedule_policy",
                                           "Scheduling Policy for RMAPS. [slot | node]",
                                           false, false, "slot", &policy);
    if (0 == strcmp(policy, "node")) {
        mca_base_param_set_string(param, "node");
    }

    /* Should we schedule on the local node or not? */

    mca_base_param_reg_int_name("rmaps", "base_schedule_local",
                                "If nonzero, allow scheduling MPI applications on the same node as mpirun (default).  If zero, do not schedule any MPI applications on the same node as mpirun",
                                false, false, 1, &value);

    /* Should we oversubscribe or not? */
    
    mca_base_param_reg_int_name("rmaps", "base_no_oversubscribe",
                                "If nonzero, then do not allow oversubscription of nodes - mpirun will return an error if there aren't enough nodes to launch all processes without oversubscribing",
                                false, false, 0, &value);
    if ((int)false == value) {
        orte_rmaps_base.oversubscribe = true;  /** default condition that allows oversubscription */
    } else {
        orte_rmaps_base.oversubscribe = false;
    }
    
    
    /* Some systems do not want any RMAPS support. In those cases,
     * memory consumption is also an issue. For those systems, we
     * avoid opening the RMAPS components by checking for a directive
     * to use the "null" component.
     */
    param = mca_base_param_reg_string_name("rmaps", NULL, NULL,
                                           false, false, NULL, NULL);
    if (ORTE_ERROR == mca_base_param_lookup_string(param, &requested)) {
        return ORTE_ERROR;
    }
    if (NULL != requested && 0 == strcmp(requested, "null")) {
        /* the user has specifically requested that we use the "null"
        * component. In this case, that means we do NOT open any
        * components, and we simply use the default module we have
        * already defined above
        */
        orte_rmaps_base.no_op_selected = true;
        orte_rmaps = orte_rmaps_no_op; /* use the no_op module */
        return ORTE_SUCCESS;
    }
    orte_rmaps_base.no_op_selected = false;
    
    /* Open up all the components that we can find */

    if (ORTE_SUCCESS != 
        mca_base_components_open("rmaps", orte_rmaps_base.rmaps_output,
                                 mca_rmaps_base_static_components, 
                                 &orte_rmaps_base.rmaps_opened, true)) {
       return ORTE_ERROR;
    }

    /* All done */

    return ORTE_SUCCESS;
}