queue_limits.c

openPBS的开放源代码

/*
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/* $Id: queue_limits.c,v 1.2.2.4 2000/09/13 23:09:09 jjones Exp $ */

/*
 * There are two routines here.  The first, queue_limits(), evaluates the 
 * limits of a queue to see if the queue can support running another job.  
 * The other, user_limits(), evaluates a job against any imposed user 
 * limit for the specified queue.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/param.h>
#if defined(sgi)
#include <sys/sysmacros.h>
#endif
#include <string.h>

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

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

/*
 * Determine if a job *can* run in this queue.  This is distinct from if
 * it *should* be run in the queue.  
 *
 * A job *can* fit in a queue if its requested resources are not greater 
 * than the queue's maximums.
 *
 * A job *should* be run only if its requested resources do not exceed the
 * queue's *available* resources.
 */
int
schd_job_fits_queue(Job *job, Queue *queue, char *reason)
{
    /* char   *id = "schd_job_fits_queue"; */


    /* Is the System architecture correct for this job? */
    if (job->arch != NULL) {
        if (strcmp(job->arch, queue->rsrcs->arch)) {
	    return (0);
	}
    }

    /* 
     * Compare the job's requested resources against the queue's limits. 
     */
    if ((queue->wallt_min != UNSPECIFIED) && 
	(job->walltime < queue->wallt_min))
    {
	if (reason)
	    (void)sprintf(reason, 
		"Does not meet queue '%s' walltime minimum (%s).", 
		    queue->qname, schd_sec2val(queue->wallt_min));
        return (0);
    }

    if ((queue->wallt_max != UNSPECIFIED) && 
	(job->walltime > queue->wallt_max))
    {
	if (reason)
	    (void)sprintf(reason, 
		"Exceeds queue '%s' walltime limit (%s).", queue->qname, 
		    schd_sec2val(queue->wallt_max));
        return (0);
    }

    if ((queue->ncpus_min != UNSPECIFIED) && (job->ncpus < queue->ncpus_min)) {
	if (reason)
	    (void)sprintf(reason, 
		"Does not meet queue '%s' CPU minimum (%d).", queue->qname, 
		queue->ncpus_min);
        return (0);
    }

    if ((queue->ncpus_max != UNSPECIFIED) && (job->ncpus > queue->ncpus_max)) {
	if (reason)
	    (void)sprintf(reason, "Exceeds queue '%s' CPU limit (%d).",
		queue->qname, queue->ncpus_max);
        return (0);
    }

    if ((queue->mem_min != UNSPECIFIED) && (job->memory < queue->mem_min)) {
	if (reason)
	    (void)sprintf(reason, 
		"Does not meet queue '%s' memory minimum (%ul).", queue->qname, 
		queue->mem_min);
        return (0);
    }

    if ((queue->mem_max != UNSPECIFIED) && (job->memory > queue->mem_max)) {
	if (reason)
	    (void)sprintf(reason, "Exceeds queue '%s' memory limit (%ul).",
		queue->qname, queue->mem_max);
        return (0);
    }

    /* 
     * The job _can_ fit in this queue.  This doesn't mean it *will* fit
     * in the queue as it currently exists, but it *would* fit if the queue
     * was completely empty.
     */
    return (1);		
}

int
schd_job_can_queue(Job *job) 
{
    QueueList *qptr;

    /* Try the batch queues, if any. */
    if (schd_BatchQueues) {
	for (qptr = schd_BatchQueues; qptr != NULL; qptr = qptr->next) {
	    if (schd_job_fits_queue(job, qptr->queue, NULL))
		return (1);
	}
    }

    /* 
     * No queues were found that could run this job.  Reject it, since it
     * will never be able to run.
     */

    return (0);
}

/* 
 * Check queue limits to see if a job should be run out of this queue.
 */
int 
schd_check_queue_limits(Queue *queue, char *reason)
{
    /* char   *id = "schd_check_queue_limits"; */

    /* Is the queue enabled?  If not, note it and fail. */
    if (queue->flags & QFLAGS_DISABLED) {
	if (reason)
	    sprintf(reason, "Queue %s not enabled", queue->qname);
	return (-1);
    }

    /* Is the queue started?  If not, note it and fail. */
    if (queue->flags & QFLAGS_STOPPED) {
	if (reason)
	    sprintf(reason, "Queue %s not started", queue->qname);
	return (-1);
    }

    /* Is the queue at the run limit?  If so, note it and fail. */
    if ((queue->maxrun != UNSPECIFIED) && 
	(queue->running >= queue->maxrun)) 
    {
	if (reason)
	    sprintf(reason, "Queue %s run limit (%d) reached",
		queue->qname, queue->maxrun);

	/*
	 * Assert the MAXRUN bit, since the queue is essentially full.
	 */
	queue->flags |= QFLAGS_MAXRUN;

	return (-1);
    }

    /* Has the queue ncpus limit been reached?  If so, note it and fail. */
    if ((queue->ncpus_max != UNSPECIFIED) && 
	(queue->ncpus_assn >= queue->ncpus_max)) 
    {
	if (reason)
	    sprintf(reason, "Queue %s CPU limit (%d) reached", queue->qname,
		queue->ncpus_max);

	/*
	 * Assert the QFLAGS_FULL bit, since a queue resource has been
	 * reached.
	 */
	queue->flags |= QFLAGS_FULL;

	return (-1);
    }

    /* Has the queue memory limit been reached?  If so, note it and fail. */
    if ((queue->mem_max != UNSPECIFIED) && 
	(queue->mem_assn >= queue->mem_max)) 
    {
	if (reason)
	    sprintf(reason, "Queue %s Memory limit", queue->qname);

	/*
	 * Assert the QFLAGS_FULL bit, since a queue resource has been
	 * reached.
	 */
	queue->flags |= QFLAGS_FULL;

	return (-1);
    }
    /*
     * There are queued jobs and no queue limits have been reached.  Set 
     * the user run limit and return okay.
     */
    return (0);
}

int schd_queue_available(Job *job, Queue *queue, char *reason)
{
    /* 
     * If this queue is missing its resource info, or if its
     * STOPPED, etc.,  skip it.
     */
    if (queue->rsrcs == NULL            ||
       (queue->flags & QFLAGS_DISABLED) ||
       (queue->flags & QFLAGS_NODEDOWN) ||
       (queue->flags & QFLAGS_STOPPED)) {

	   /* sprintf(reason, "Queue unavailable"); */
           return(0);
    }

    /*
     * Check if this job *could* run in this queue or not, based on
     * queue minimum and maximum limits, architecture, etc. 
     */
    if (!schd_job_fits_queue(job, queue, reason))
        return(0);
    
    /*
     * If this job has a user access control list, check that this
     * job can be allowed in it.
     */
    if (queue->useracl && (queue->flags & QFLAGS_USER_ACL)) {
    	if (!schd_useracl_okay(job, queue, reason))
            return(0);
    }

    return(1); /* okay to run in this queue */
}