schedule.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.
* 
* ---------------------------------------------------------------------------
* For a license to use or redistribute the OpenPBS software under conditions
* other than those described below, or to purchase support for this software,
* please contact Veridian Systems, PBS Products Department ("Licensor") at:
* 
*    www.OpenPBS.org  [phone]                  [e-mail]
*                        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,
* are permitted provided that all of the following conditions are met.
* After December 31, 2001, only conditions 3-6 must be met:
* 
* 1. Commercial and/or non-commercial use of the Software is permitted
*    provided a current software registration is on file at www.OpenPBS.org.
*    If use of this software contributes to a publication, product, or
*    service, proper attribution must be given; see www.OpenPBS.org/credit.html
* 
* 2. Redistribution in any form is only permitted for non-commercial,
*    non-profit purposes.  There can be no charge for the Software or any
*    software incorporating the Software.  Further, there can be no
*    expectation of revenue generated as a consequence of redistributing
*    the Software.
* 
* 3. Any Redistribution of source code must retain the above copyright notice
*    and the acknowledgment contained in paragraph 6, this list of conditions
*    and the disclaimer contained in paragraph 7.
* 
* 4. Any Redistribution in binary form must reproduce the above copyright
*    notice and the acknowledgment contained in paragraph 6, this list of
*    conditions and the disclaimer contained in paragraph 7 in the
*    documentation and/or other materials provided with the distribution.
* 
* 5. Redistributions in any form must be accompanied by information on how to
*    obtain complete source code for the OpenPBS software and any
*    modifications and/or additions to the OpenPBS software.  The source code
*    must either be included in the distribution or be available for no more
*    than the cost of distribution plus a nominal fee, and all modifications
*    and additions to the Software must be freely redistributable by any party
*    (including Licensor) without restriction.
* 
* 6. All advertising materials mentioning features or use of the Software must
*    display the following acknowledgment:
* 
*     "This product includes software developed by NASA Ames Research Center,
*     Lawrence Livermore National Laboratory, and Veridian Information 
*     Solutions, Inc.
*     Visit www.OpenPBS.org for OpenPBS software support,
*     products, and information."
* 
* 7. DISCLAIMER OF WARRANTY
* 
* THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT
* ARE EXPRESSLY DISCLAIMED.
* 
* IN NO EVENT SHALL VERIDIAN CORPORATION, ITS AFFILIATED COMPANIES, OR THE
* U.S. GOVERNMENT OR ANY OF ITS AGENCIES BE LIABLE FOR ANY DIRECT OR INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* 
* This license will be governed by the laws of the Commonwealth of Virginia,
* without reference to its choice of law rules.
*/
/* $Id: schedule.c,v 1.1.6.2 2000/08/09 00:18:46 hender Exp $ */

/*
 * This is the main loop for the scheduler.  The scheduler receives a 
 * command and then calls the routine schedule().  Appropriate actions 
 * are taken based on the command specified.  All actions taken by the 
 * scheduler must be initiated from here.
 */

#include <sys/stat.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

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

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

extern int connector;
extern char *schd_CmdStr[16];

/*
 * How many seconds to wait before attempting to re-request the job and queue 
 * information from the server.
 */
#define WAIT_FOR_QUEUE_SANITY	10

Resources schd_Rsrcs;		/* system resources */
time_t  schd_TimeNow;
time_t  schd_TimeLast = 0;
struct tm schd_TmNow;
int     last_run_in_pt = 0;

Job    *schd_AllJobs = NULL;

static int schd_req		(int cmd);
static int get_all_queue_info	(int numqlists, QueueList *list, ...);
static Job *reject_unrunnables	(Job *jobs);
static int schedule_jobs	(QueueList *queues, Job *jobs, char *reason);
static int schedule_restart	(Job *joblist);
static int make_job_dump	(char *dumpfile);
static int dump_sorted_jobs	(FILE *file, Job *joblist);
void       fix_jim 		(Queue *submit, Queue *jim);


/*
 * This routine gets the scheduling command and takes appropriate action. 
 * C.f. PBS Administrator's Guide, Section 4.1.
 *
 * Valid commands are:
 *    SCH_ERROR            ERROR.
 *    SCH_SCHEDULE_NULL    Place holder.
 *    SCH_SCHEDULE_NEW     New job arrived or a non-running job changed state.
 *    SCH_SCHEDULE_TERM    A running job terminated.
 *    SCH_SCHEDULE_TIME    The schedulers time interval expired.
 *    SCH_SCHEDULE_RECYC   One job was started in the last scheduling cycle.
 *    SCH_SCHEDULE_CMD     The server attribute "scheduling" was set to true.
 *    SCH_CONFIGURE        Perform any scheduler [re]configuration.
 *    SCH_QUIT             QUIT
 *    SCH_RULESET          Reread the scheduler rules.
 *    SCH_SCHEDULE_FIRST   First schedule run after server starts.
 */
int 
schedule(int cmd)
{
    char   *id = "schedule";
    char   *cmdstr = "Error";

    /*
     * Try to find a text string that describes the command request.
     */
    if (cmd >= 0)
	cmdstr = (schd_CmdStr[cmd] != NULL) ? schd_CmdStr[cmd] : "Unknown";

    (void)sprintf(log_buffer, "Schedule: received cmd %d (%s)", cmd, cmdstr);

    log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
    DBPRT(("--------\n%s\n", log_buffer));

    /*
     * See if a reconfiguration is pending.  If so, do it before anything
     * starts to look at the structures.
     */
    if (schd_sigflags & SCHD_SIGFLAGS_RECONFIG) {
	(void)sprintf(log_buffer, "Reconfiguring due to delivery of SIGHUP.");
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s: %s\n", id, log_buffer));

	if (schedinit(0, NULL)) {
	    (void)sprintf(log_buffer, 
		"%s: FATAL ERROR!!!  Configuration failed!!!", id);
	    log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	    DBPRT(("%s: %s\n", id, log_buffer));

	    exit (1);
	}

	/* Turn off the pending reconfiguration flag. */
	schd_sigflags &= ~SCHD_SIGFLAGS_RECONFIG;
    }

    /* 
     * Assume the scheduler is about to use the current configuration.
     * Set the BUSY flag so that reconfiguration will be postponed until
     * the scheduler is idle if a SIGHUP is delivered. 
     */
    schd_sigflags |= SCHD_SIGFLAGS_BUSY;

    switch (cmd) {
    /*
     * "Null" commands.  These cases are quietly ignored. 
     */
    case SCH_SCHEDULE_NULL:	/* Placeholder only.                        */
    case SCH_ERROR:		/* Error.                                   */
    case SCH_RULESET:		/* Re-read scheduler rules.                 */
	(void)sprintf(log_buffer, "command %d ignored.", cmd);
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s\n", log_buffer));

	break;

    /* 
     * These commands cause the scheduler to perform its scheduling cycle. 
     */
    case SCH_SCHEDULE_FIRST:	/* 1st schedule run after server starts.    */
    case SCH_SCHEDULE_CMD:	/* Perform a schedule run now, on command.  */
    case SCH_SCHEDULE_TERM:	/* A running job terminated.                */
    case SCH_SCHEDULE_NEW:	/* A new job has arrived.                   */
    case SCH_SCHEDULE_TIME:	/* Scheduler sleep interval reached.        */
    case SCH_SCHEDULE_RECYC:	/* Recycle scheduler after 1 run.           */

	if (!schd_req(cmd)) {
	    schd_cleanup();
	    DBPRT(("schd_req(%d) returned 0.  Calling it again.\n", cmd));
	    schd_req(cmd);
	}
	schd_cleanup();
	break;

    case SCH_CONFIGURE:		/* Re-initialize the scheduler.             */
	(void)sprintf(log_buffer, "[re]configure scheduler");
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s\n", log_buffer));

	schedinit(0, NULL);		/* XXX args not used... for now! */
	break;

    case SCH_QUIT:		/* Exit gracefully.                         */
	(void)sprintf(log_buffer, "Scheduler was asked to quit.  Exit.");
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s\n", log_buffer));

	exit(0);

    default:
	(void)sprintf(log_buffer, "Schedule command %d unrecognized.", cmd);
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s\n", log_buffer));
    }

    /* 
     * The scheduling part of the scheduler is now idle.  Unset the BUSY
     * flag.
     */
    schd_sigflags &= ~SCHD_SIGFLAGS_BUSY;
    schd_FirstRun = 0;

    return (0);
}

/*
 * Service a request to schedule a job.
 */
/* ARGSUSED */
int 
schd_req(int cmd)
{
    char   *id = "schd_req";
    Job    *this, *jobs = NULL;
    QueueList *qptr, *next;
    QueueList *normalQs = NULL, *normalQtail = NULL, *newqlp;
    Outage *outages;
    int     ran, error, total_ran = 0;
    int     hosts_in_dedtime = 0;
    struct tm *tm_ptr;
    char    reason[MAX_TXT + 1];

    /* Save "last" run time (in global 'schd_TimeNow') for later use. */
    schd_TimeLast = schd_TimeNow;

    /* 
     * Get the number of seconds since the Epoch, and break it down into
     * the various day, month, year, fields in a struct tm.
     */
    time(&schd_TimeNow);
    if (tm_ptr = localtime(&schd_TimeNow))
	memcpy((void *)&schd_TmNow, (void *)tm_ptr, sizeof (struct tm));
    else
	memset((void *)&schd_TmNow, 0, sizeof (struct tm));

    DBPRT(("[time_t %d] %s", schd_TimeNow, ctime(&schd_TimeNow)));

    /*
     * If the configuration file has been changed since the last time the
     * scheduler was run, than note that in the logs.  Don't re-read it
     * automatically, just note the fact.  Don't reset the timestamp - it
     * will be done when someone finally HUP's the scheduler.
     */
    if (schd_CfgFilename && schd_file_has_changed(schd_CfgFilename, 0)) {
	(void)sprintf(log_buffer, 
	    "WARNING!!!  Scheduler config file %s has changed!", 
		schd_CfgFilename);
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s: %s\n", id, log_buffer));
	(void)sprintf(log_buffer, "Run 'kill -HUP %ld' to reconfigure.", 
	    (long)getpid());
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s: %s\n", id, log_buffer));
    }

    /* 
     * See if the holidays file has changed.  If it's re-read successfully,
     * update the last changed timestamp.  Otherwise, keep it around and
     * keep trying to re-read it until someone fixes the problem.  "This
     * shouldn't happen."
     */
    if (schd_file_has_changed(HOLIDAYS_FILE, 0) > 0) {
	(void)sprintf(log_buffer, 
	    "Attempting to update holidays/primetime from %s.", HOLIDAYS_FILE);
	log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	DBPRT(("%s\n", log_buffer));

	if (schd_read_holidays() < 0) {
	    (void)sprintf(log_buffer, "Failed to read holidays file.");
	    log_record(PBSEVENT_SYSTEM, PBS_EVENTCLASS_SERVER, id, log_buffer);
	    DBPRT(("%s\n", log_buffer));
	} else {
	    /* Reset the "last changed time", since it was re-read okay. */
	    (void)schd_file_has_changed(HOLIDAYS_FILE, 1);
	}
    }

    /* 
     * If this is the first run during non-primetime, set all the execution
     * queues' observed primetime back to 'on'.  If it's primetime now, set
     * the "last run in primetime" global.
     */
    if (schd_ENFORCE_PRIME_TIME && schd_TimeNow >= schd_ENFORCE_PRIME_TIME) {
	if (schd_prime_time(0)) {
	    last_run_in_pt = 1;

	} else if (last_run_in_pt) {
	    DBPRT(("%s: First non-pt run, reset queue observed times.\n", id));
	    if (schd_BatchQueues)
		 schd_reset_observed_pt(schd_BatchQueues);

	    /* Last run was not in prime time. */
	    last_run_in_pt = 0;
	}
    }

    /* Get the current list of all jobs known to our server.
     * Set the job->priority field so that each jobs is assign an
     * inherent priority, using several criteria including recent
     * past usage, nodes requsted, time on queue, originating queue
     * and then populate the schd_AllJobs list with these jobs
     */
    jobs = schd_get_jobs(NULL, NULL);

    /*
     * Check for queued jobs on any of the run queues.  This may happen if
     * there is some glitch and the POSIX jobs are checkpointed.
     * schedule_restart() will return non-zero if it finds and restarts 
     * any jobs.  Recycle if this is the case.
     */
    if (schd_SCHED_RESTART_ACTION != SCHD_RESTART_NONE) {
	if (schedule_restart(jobs)) {
	    schd_free_jobs(jobs);
	    return (0);
	}
    }

    /*
     * Sort jobs by the priority field set above. Note that the jobs
     * are reordered "in situ".  The sorting routine returns a pointer to
     * the new head of the list created by relinking the elements of the
     * linked list, or NULL if an error occurs.  Zero the original list
     * pointer to reduce confusion - the same list, in different order, now
     * lives on schd_AllJobs.
     */
    schd_AllJobs = schd_sort_jobs(jobs);
    jobs = NULL;

    /* now query the GRM on the T3e to get the node map information;
     * and then correlatate in-use PEs to running jobs, filling the global
     * schd_PEMAP in the process.
     */
    if (load_pe_map(schd_AllJobs)) {
	/* unable to get PE map ... do something... */