getrsrcs.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
* 
* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
* All rights reserved.
* 
* ---------------------------------------------------------------------------
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* please contact Veridian Systems, PBS Products Department ("Licensor") at:
* 
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*                        877 902-4PBS (US toll-free)
* ---------------------------------------------------------------------------
* 
* This license covers use of the OpenPBS v2.3 software (the "Software") at
* your site or location, and, for certain users, redistribution of the
* Software to other sites and locations.  Use and redistribution of
* OpenPBS v2.3 in source and binary forms, with or without modification,
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* 
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/* $Id: getrsrcs.c,v 1.3.2.1.2.4 2000/08/09 00:19:16 hender Exp $ */

/*
 *  Obtain resource information from the resource monitor and
 *  job counts from the server.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysmacros.h>
#include <string.h>
#include <unistd.h>

/* PBS header files */
#include "pbs_error.h"
#include "pbs_ifl.h"
#include "log.h"
#include "resmon.h"
#include "rm.h"

/* Scheduler header files */
#include "toolkit.h"
#include "gblxvars.h"
#include "hpm.h"

#ifndef	GETRSRCS_CONNECT_TIME
#define	GETRSRCS_CONNECT_TIME	10	/* how long to wait for resource info */
#endif	/* ! GETRSRCS_CONNECT_TIME */

Resources *schd_RsrcsList = NULL;	/* List of hosts and their resources */

extern char *schd_CmdStr[16];

static void dump_resources(Resources *rsrcs);

/* ARGSUSED */
static void
connect_interrupt(int signo)
{
	/* 
	 * Do nothing.  Just accept the signal and allow an alarmed syscall 
	 * to be interrupted.
	 */
	return;
}

/*
 * Find an entry for the resources for the requested host in the list of
 * existing resources, or create a new one for that host and return it.
 */
Resources *
schd_get_resources(char *exechost)
{
    char   *id = "schd_get_resources";
    Resources *rptr, *new_rsrcs;
    int     rm;

    char   *response = NULL;
    int     badreply   = 0;
    int     cpus_avail = 0;
    size_t  pmem_avail = 0;

    char    hpm_ctl[64];

    struct sigaction act, oact;

    unsigned int remain;	/* Time remaining in any old alarm(). */
    time_t then;		/* When this alarm() was started. */

#ifdef NODEMASK
    Bitfield cpy;
    int     i, j;
#endif	/* NODEMASK */

    /*
     * Check for a local copy of the resources being available already.
     * If so, just return a reference to that Resources structure.
     */
    if (schd_RsrcsList != NULL) {
	for (rptr = schd_RsrcsList; rptr != NULL; rptr = rptr->next)
	    if (strcmp(rptr->exechost, exechost) == 0)
		return (rptr);
    }
	    
    schd_timestamp("get_rsrcs");

    /* 
     * No cached resource information for 'exechost'.  Need to query the
     * host for its information.
     */
    if ((new_rsrcs = (Resources *)malloc(sizeof(Resources))) == NULL) {
	(void)sprintf(log_buffer, "Unable to alloc space for Resources.");
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s: %s\n", id, log_buffer));

	return (NULL);	/* Can't get the information - nowhere to store it. */
    }

    memset((void *)new_rsrcs, 0, sizeof(Resources));

    act.sa_flags = 0;
    act.sa_handler = connect_interrupt;
    sigemptyset(&act.sa_mask);
    remain = 0;
    then = 0;

    /* 
     * Set the alarm, and maintain some idea of how long was left on any
     * previously set alarm.
     */
    if (sigaction(SIGALRM, &act, &oact) == 0) {
	remain = alarm(GETRSRCS_CONNECT_TIME);
	then = time(NULL);
    }

    if ((rm = openrm(exechost, 0)) == -1) {
	(void)sprintf(log_buffer,
	      "Unable to contact resmom@%s (%d)", exechost, pbs_errno);
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);

	badreply = 1;
	goto bail;
    }

    /*
     * Turn off full response.  Responses will be received in the order in 
     * which they are sent.
     */
    fullresp(0);

    /* Build a list of all the resources about which we want information. */

    addreq(rm, "loadave");
    addreq(rm, "availmem");
    addreq(rm, "physmem");
    addreq(rm, "ncpus");
#ifdef NODEMASK
    addreq(rm, "availmask");
#endif	/* NODEMASK */

    if (schd_MANAGE_HPM) {
	(void)sprintf(hpm_ctl, HPM_CTL_FORMAT_STR, HPM_CTL_QUERY_STR);
	addreq(rm, hpm_ctl);
    }

    /* Get the values back from the resource monitor, and round up. */

    /* Receive LOADAVE response from resource monitor. */
    response = getreq(rm);
    if (response != NULL) {
	new_rsrcs->loadave = atof(response) * schd_FAKE_MACH_MULT;
	(void)free(response);
    } else {
	(void)sprintf(log_buffer, "bad return from getreq(loadave), %d, %d", 
		      pbs_errno, errno);
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	badreply = 1;