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pbs_sched(8B)			      PBS			 pbs_sched(8B)

       pbs_sched_cc - pbs C scheduler

       pbs_sched   [-a alarm]	[-d home]   [-L	logfile]  [-p file]  [-S port]
       [-R port] [-c file]

       The pbs_sched program runs in conjunction  with	the  PBS  server.   It
       queries	the  server  about  the	 state	of  PBS	 and communicates with
       pbs_resmon to get information about the status of running jobs,	memory
       available etc.  It then makes decisions as to what jobs to run.

       pbs_sched must be executed with root permission.

       -a alarm	      This  specifies the time in seconds to wait for a	sched-
		      ule run to finish.  If a script takes too	long  to  fin-
		      ish,  an	alarm  signal  is  sent,  and the scheduler is
		      restarted.  If a core file does not exist	in the current
		      directory,  abort()  is called and a core	file is	gener-
		      ated.  The default for alarm is 180 seconds.

       -d home	      This specifies the PBS home  directory,  PBS_HOME.   The
		      current	working	  directory   of   the	 scheduler  is
		      PBS_HOME/sched_priv.   If	 this  option  is  not	given,
		      PBS_HOME	defaults to $PBS_SERVER_HOME as	defined	during
		      the PBS build procedure.

       -L logfile     Specifies	an absolute path name of the file  to  use  as
		      the log file.  If	not specified, the scheduler will open
		      a	  file	 named	 for   the   current   date   in   the
		      PBS_HOME/sched_logs directory (see the -d	option).

       -p file	      This  specifies the "print" file.	 Any output from the C
		      code which is written to standard	out or standard	 error
		      will  be	written	 to  this file.	 If this option	is not
		      given,	  the	   file	      used	 will	    be
		      PBS_HOME/sched_priv/sched_out .  See the -d option.

       -S port	      This  specifies  the port	to use.	 If this option	is not
		      given, the default port for the PBS scheduler is used.

       -R port	      This specifies the resource monitor  port	 to  use.   If
		      this  option  is not given, the default port for the PBS
		      mom is used.  NOTE: this option only makes the mom  port
		      available	 to  the  scheduler  writer.  It doesn't force
		      them to use it.

       -c file	      Specify a	configuration file, see	description below.  If
		      this  is	a  relative  file  name	it will	be relative to
		      PBS_HOME/sched_priv, see the -d option.  If the  -c  op-
		      tion is not supplied, pbs_sched will not attempt to open
		      a	configuration file.

       The options that	specify	file names may be absolute  or	relative.   If
       they are	relative, their	root directory will be PBS_HOME/sched_priv.

       This  version of	the scheduler requires knowledge of the	C language and
       the PBS API.  Source code is provided for a main	program	for the	sched-
       uler.   The  site  must supply the heart	of the program.	 When invoked,
       the main	 program  performs  general  initialization  and  housekeeping
       chores.	 Then  a  locally  supplied function, schedinit() is called to
       perform site specific initialization.

       In the main loop, a locally supplied function, schedule() is called  to
       make the	scheduling decisions and perform any required actions.	Infor-
       mation about jobs and queues is obtained	from the  Server  through  the
       standard	PBS API	as found in libifl.a.  Information about the execution
       host(s) is obtained from	the Resource Monitor.  Routines	to communicate
       with the	Resource Monitor are found in libnet.a.

       If the processing takes more than the allotted time, the	scheduler will
       restart itself.	The default amount of time is three minutes.  This can
       be changed with the -a option.

       On  receipt of a	SIGHUP signal, the scheduler will close	and reopen its
       log file	and reread its configuration file (if any).

       A configuration file may	be specified with the -c  option.   This  file
       may be used to specify the hosts	(servers) which	are allowed to connect
       to pbs_sched.  The hosts	are specified in the configuration file	 in  a
       manor identical to that used in pbs_mom.

	      One or more servers, one per line, may be	specified:

	      $clienthost    hostname  +.IP restricted Allows connections from
	      non-priviledged ports on the named hosts.	 Typically  only  used
	      with Mac OSX:

	      $restricted   hostname

	      Two  host	 names	are always allowed to connection to pbs_sched,
	      "localhost" and the name returned	to  pbs_sched  by  the	system
	      call  gethostname().   These  names need not be specified	in the
	      configuration file.

       The configuration file must be "secure".	 It must be owned by a user id
       and group id less than 10 and not be world writable.

		 the  default  directory  for  configuration  files, typically

Signal Handling
       A C based scheduler will	handle the following signals:

       SIGHUP The server will close and	reopen its log	file  and  reread  the
	      config file if one exists.

	      If  the  site supplied scheduling	module exceeds the time	limit,
	      the Alarm	will cause the scheduler to attempt to core  dump  and
	      restart itself.

	      Will result in an	orderly	shutdown of the	scheduler.

       All other signals have the default action installed.

       Upon normal termination,	an exit	status of zero is returned.

       pbs_sched_tcl(8B), pbs_server(8B), and pbs_mom(8B).
       PBS Internal Design Specification

Local								 pbs_sched(8B)


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