Slurm API(3)

NAME
slurm_free_node_info_msg, slurm_load_node, slurm_load_node_single, slurm_print_node_info_msg, slurm_print_node_table, slurm_sprint_node_table - Slurm node information reporting functions

SYNTAX

#include <stdio.h>
#include <slurm/slurm.h>

void slurm_free_node_info_msg (
    node_info_msg_t *node_info_msg_ptr
);

int slurm_load_node (
    time_t update_time,
    node_info_msg_t **node_info_msg_pptr,
    uint16_t show_flags
);

int slurm_load_node_single (
    node_info_msg_t **node_info_msg_pptr,
    char *node_name,
    uint16_t show_flags
);

void slurm_print_node_info_msg (
    FILE *out_file,
    node_info_msg_t *node_info_msg_ptr,
    int one_liner
);

void slurm_print_node_table (
    FILE *out_file,
    node_info_t *node_ptr,
    int one_liner
);

char *slurm_sprint_node_table (
    node_info_t *node_ptr,
    int one_liner
);

ARGUMENTS

node_info_msg_ptr
    Specifies the pointer to the structure created by slurm_load_node.

node_info_msg_pptr
    Specifies the double pointer to the structure to be created and filled with the time of the last node update, a record count, and detailed information about each node. Detailed node information is written to fixed sized records and includes: name, state, processor count, memory size, etc. See slurm.h for full details on the data structure's contents.

node_name
    Name of the node for which information is requested.

node_ptr
    Specifies a pointer to a single node record from the node_info_msg_ptr data structure.

one_liner
    Print one record per line if non-zero.

out_file
    Specifies the file to print data to.

show_flags
    Job filtering flags, may be ORed. Information about nodes in partitions that are configured as hidden and partitions that the user's group is unable to utilize are not reported by default. The SHOW_ALL flag will cause information about nodes in all partitions to be displayed. Only information about nodes on the local cluster will be returned unless the cluster is in a federation and the SHOW_ALL flag is set.

update_time
    For all of the following informational calls, if update_time is equal to or greater than the last time changes where made to that information, new information is not returned. Otherwise all the configuration. job, node, or partition records are returned.

DESCRIPTION

slurm_free_node_info_msg Release the storage generated by the slurm_load_node function.

slurm_load_node_single issue RPC to get slurm configuration information for a specific node.

slurm_load_node Returns a node_info_msg_t that contains an update time, record count, and array of node_table records for all nodes. Note that nodes which are hidden for any reason will have a NULL node name. Other fields associated with the node will be filled in appropriately. Reasons for a node being hidden include: a node state of FUTURE, a node in the CLOUD that is powered down, or a node in a hidden partition.

slurm_print_node_info_msg Prints the contents of the data structure describing all node records from the data loaded by the slurm_load_node function.

slurm_print_node_table Prints the contents of the data structure describing a single node record loaded by the slurm_load_node function.

RETURN VALUE

On success, zero is returned. On error, -1 is returned, and Slurm error code is set appropriately.

ERRORS

SLURM_NO_CHANGE_IN_DATA Data has not changed since update_time.

SLURM_PROTOCOL_VERSION_ERROR Protocol version has changed, re-link your code.

SLURM_PROTOCOL_SOCKET_IMPL_TIMEOUT Timeout in communicating with Slurm controller.

EXAMPLE

#include <stdio.h>
#include <stdlib.h>
#include <slurm/slurm.h>
#include <slurm/slurm_errno.h>

int main (int argc, char *argv[])
{
    int i, j, k;
    partition_info_msg_t *part_buffer_ptr = NULL;
    partition_info_t *part_ptr;
    node_info_msg_t *node_buffer_ptr = NULL;
    node_info_t *node_ptr;

    /* get and dump some node information */
    if ( slurm_load_node ((time_t) NULL,
                        &node_buffer_ptr, SHOW_ALL) ) {
        slurm_perror ("slurm_load_node error");
        exit (1);
    }

    /* The easy way to print... */
    slurm_print_node_info_msg (stdout, node_buffer_ptr, 0);

    /* A harder way.. */
    for (i = 0; i < node_buffer_ptr->record_count; i++) {
        node_ptr = &node_buffer_ptr->node_array[i];
        slurm_print_node_table(stdout, node_ptr, 0, 0);
    }

    /* The hardest way. */
    for (i = 0; i < node_buffer_ptr->record_count; i++) {
        printf ("NodeName=%s CPUs=%u\n",
            node_buffer_ptr->node_array[i].name,
            node_buffer_ptr->node_array[i].cpus);
    }

    /* get and dump some partition information */
    /* note that we use the node information loaded */
    /* above and we assume the node table entries have */
    /* not changed since */
    if ( slurm_load_partitions ((time_t) NULL,
                        &part_buffer_ptr, 0) ) {
        slurm_perror ("slurm_load_partitions error");
        exit (1);
    }
    for (i = 0; i < part_buffer_ptr->record_count; i++) {
        part_ptr = &part_buffer_ptr->partition_array[i];
        printf ("PartitionName=%s Nodes=",
            part_ptr->name);
        for (j = 0; part_ptr->node_inx; j+=2) {
            if (part_ptr->node_inx[j] == -1)
                break;
            for (k = part_ptr->node_inx[j];
                 k <= part_ptr->node_inx[j+1];
                 k++) {
                printf ("%s ", node_buffer_ptr->
                        node_array[k].name);
            }
        }
        printf("\n\n");
    }
    slurm_free_node_info_msg (node_buffer_ptr);
    slurm_free_partition_info_msg (part_buffer_ptr);
    exit (0);
}

NOTES
These functions are included in the libslurm library, which must be linked to your process for use (e.g. "cc -lslurm myprog.c").

Some data structures contain index values to cross-reference each other. If the show_flags argument is not set to SHOW_ALL when getting this data, these index values will be invalid.

COPYING
Copyright (C) 2002-2006 The Regents of the University of California. Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). CODE-OCEC-09-009. All rights reserved.

This file is part of Slurm, a resource management program. For details, see <https://slurm.schedmd.com/>.

Slurm is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Slurm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

SEE ALSO

scontrol(1), squeue(1), slurm_allocation_lookup(3), slurm_get_errno(3), slurm_load_partitions(3), slurm_perror(3), slurm_strerror(3)