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.TH pbs_mom 8B "8 November 2017" Local "PBS Professional"
.SH NAME
.B pbs_mom 
- run the PBS job monitoring and execution daemon
.SH SYNOPSIS
.B pbs_mom 
[-a <alarm timeout>] 
[-C <checkpoint directory>] 
.RS 8
[-c <config file>] 
[-d <MoM home directory>] 
[-L <logfile>] 
.br
[-M <MoM service port>] 
[-N]
[-n <nice value>] 
[-p|-r] 
.br
[-R <inter-MoM communication port>] 
[-S <server port>]
.br
[-s script_options]
.RE
.B pbs_mom
--version

.SH DESCRIPTION
The
.B pbs_mom
command starts the PBS job monitoring and execution daemon, called
MoM.  

The standard MoM starts jobs on the execution host, monitors and reports
resource usage, enforces resource usage limits, and notifies the
server when the job is finished.  The MoM also runs any prologue
scripts before the job runs, and runs any epilogue scripts after the
job runs.  

The MoM performs any communication with job tasks and with other MoMs.
The MoM on the first vnode on which a job is running manages
communication with the MoMs on the remaining vnodes on which the job
runs.

The MoM manages one or more vnodes.  PBS may treat a  host as 
a set of virtual nodes, in which case one MoM 
manages all of the host's vnodes.  See the 
.B PBS Professional Administrator's Guide.

.B Logging
.br
The MoM's log file is in PBS_HOME/mom_logs.  The MoM writes an
error message in its log file when it encounters any error.  If it
cannot write to its log file, it writes to standard error.  The
MoM writes events to its log file.  
The MoM writes its PBS 
version and build information to the logfile whenever it starts up or 
the logfile is rolled to a new file.

.B Required Permission
.br
The executable for 
.B pbs_mom
is in PBS_EXEC/sbin, and can be run only by root on Linux, and Admin 
on Windows.

.B Cpusets
.br
A cpusetted machine can have a "boot cpuset" defined by the
administrator.  A boot cpuset contains one or more CPUs and memory
boards and is used to restrict the default placement of system
processes, including login.  If defined, the boot cpuset contains
CPU 0.

Run parallel jobs exclusively within a cpuset for repeatability of
performance.  HPE SGI states, "Using cpusets on an HPE SGI system improves
cache locality and memory access times and can substantially improve
an application's performance and runtime repeatability."

The CPUSET_CPU_EXCLUSIVE flag prevents CPU 0 from being used by
the MoM in the creation of job cpusets.  This flag is set by default,
so this is the default behavior.

To find out which cpuset is assigned to a running job, use
.B qstat
-f
to see the 
.I cpuset 
field in the job's
.I altid 
attribute.

.B HPE SGI Machine Running Supported Versions of Performance Software - 
Message Passing Interface
.br
The cpusets created for jobs are marked cpu-exclusive.

MoM does not use any CPU which was in use at startup.

A PBS job can run across multiple machines that run supported versions 
of Performance Software - Message Passing Interface.

PBS can run using HPE SGI's MPI (MPT) over InfiniBand.  See the 
.B PBS Professional Administrator's Guide.
.LP

.B Effect on Jobs of Starting MoM
.br
When MoM is started or restarted, her default behavior is to leave
any running processes running, but to tell the PBS server to requeue
the jobs she manages.  MoM tracks the process ID of jobs across 
restarts.

In order to have all jobs killed and requeued, use the 
.I r
option when starting or restarting MoM.

In order to leave any running processes running, and not to requeue
any jobs, use the 
.I p
option when starting or restarting MoM.

.SH OPTIONS
.IP "-a <alarm timeout>" 10
Number of seconds before alarm timeout.  
Whenever a resource request is processed, an alarm is set for the
given amount of time.  If the request has not completed before 
.I alarm timeout, 
the OS generates an alarm signal and sends it to MoM.  
Default: 10 seconds.  Format: integer.

.IP "-C <checkpoint directory>" 10
Specifies the path of the directory where MoM creates job-specific
subdirectories used to hold each job's restart files.  MoM passes this
path to checkpoint and restart scripts.  Overrides other checkpoint
path specification methods.  Any directory specified with the
.I -C 
option must be owned, readable, writable, and executable by root only 
.I (rwx,---,---, or 0700), 
to protect the security of the checkpoint files.  See the 
.I -d 
option.  Format: string.
.br
Default: PBS_HOME/spool/checkpoint.  

.IP "-c <config file>" 10
MoM will read this alternate default configuration file upon starting.
If this is a relative file name it will be relative to
PBS_HOME/mom_priv.  If the specified file cannot be opened,
.B pbs_mom 
will abort.  See the 
.I -d 
option.

MoM's normal operation, when the -c option is not given, is to attempt
to open the default configuration file PBS_HOME/mom_priv/config.
If this file is not present,
.B pbs_mom 
will log the fact and continue.

.IP "-d <MoM home directory>" 10
Specifies the path of the 
.I directory 
to be used in place of PBS_HOME by
.B pbs_mom.
The default directory is given by $PBS_HOME.  Format: string.

.IP "-L <logfile>" 10
Specifies an absolute path and filename for the log file.
The default is a file named for the current date in PBS_HOME/mom_logs/.
See the
.I -d
option.  Format: string.

.IP "-M <MoM port>" 10
Specifies the number of the port on which MoM will
listen for server requests and instructions.  Overrides 
PBS_MOM_SERVICE_PORT setting in pbs.conf and environment variable.
Default: 15002.
Format: integer port number.

.IP "-n <nice value>" 10
Specifies the priority for the
.B pbs_mom 
daemon.  Format: integer.

.IP "-N" 10
Specifies that when starting, MoM should not detach from the
current session.

.IP "-p" 10
Specifies that when starting, MoM should allow any running jobs
to continue running, and not have them requeued.  This option 
can be used for single-host jobs only; multi-host jobs cannot
be preserved.
Cannot be used with the
.I -r
option.  
MoM is not the parent of these jobs.

.RS
.IP "HPE SGI systems running Performance Software - Message Passing Interface" 5
The cpuset-enabled
.B pbs_mom 
will, if given the 
.I -p
flag, use the existing CPU and memory allocations for the /PBSPro
cpusets.
The default behavior is to remove these cpusets.
Should this fail, MoM will exit, asking to be restarted with the
.I -p
flag.
.LP
.RE

.IP "-r" 10
Specifies that when starting, MoM should requeue any rerunnable jobs and 
kill any non-rerunnable jobs that 
she was tracking, and mark the 
jobs as terminated.  Cannot be used with the
.I -p
option.  
MoM is not the parent of these jobs.  

It is not recommended to use the 
.I -r 
option after a reboot, because process IDs of new, legitimate tasks
may match those MoM was previously tracking.  If they match and MoM is
started with the 
.I -r
option, MoM will kill the new tasks.

.IP "-R <inter-MoM communication port>" 10
Specifies the number of the port on which MoM will listen for pings,
resource information requests, communication from other MoMs, etc.  
Overrides PBS_MANAGER_SERVICE_PORT setting in pbs.conf and environment variable.
Default:  15003.  Format: integer port number.

.IP "-S <server port>" 10
Specifies the port number on which 
.B pbs_mom
initially contacts the server.  Default: 15001.  Format: integer port number.

.IP "-s <script options>" 5
This option provides an interface that allows the administrator to
add, delete, and display MoM's configuration files.  See 
.B CONFIGURATION FILES.  
The 
.I script options 
are used this way:
.RS
.IP "-s insert <scriptname> <inputfile>" 5
Reads 
.I inputfile 
and inserts its contents in a new site-defined
.B pbs_mom
configuration file with the filename 
.I scriptname.  
If a
site-defined configuration file with the name 
.I scriptname 
already exists,
the operation fails, a diagnostic is presented, and 
.B pbs_mom
exits with a nonzero status.  Scripts whose names begin with
the prefix "PBS" are reserved.  An attempt to add a script
whose name begins with "PBS" will fail.  
.B pbs_mom will print a diagnostic message and exit
with a nonzero status.  Example:

.B pbs_mom -s insert <scriptname> <inputfile>

.IP "-s remove <scriptname>" 5
The configuration file named 
.I scriptname 
is removed
if it exists.  If the given name does not exist or if an
attempt is made to remove a script with the reserved "PBS"
prefix, the operation fails, a diagnostic is presented, and
.B pbs_mom 
exits with a nonzero status.  Example:

.B pbs_mom -s remove <scriptname> 

.IP "-s show <scriptname>" 5
Causes the contents of the named script to be printed to
standard output.  If 
.I scriptname 
does not exist, the
operation fails, a diagnostic is presented, and 
.B pbs_mom
exits with a nonzero status.  Example:

.B pbs_mom -s show <scriptname> 

.IP "-s list" 5
Causes 
.B pbs_mom 
to list the set of PBS-prefixed and site-defined configuration
files in the order in which they are executed.  Example:

.B pbs_mom -s list

.LP

.B WINDOWS:
.RS 5
Under Windows, the 
.I -N
option must be used, so that 
.B pbs_mom 
will start up as a standalone
program.  For example:

.B pbs_mom -N -s insert <scriptname> <inputfile>

or 

.B pbs_mom -N -s list

.RE


.RE

.LP
.IP "--version" 10
The 
.B pbs_mom
command returns its PBS version information and exits.
This option can only be used alone.

.SH CONFIGURATION FILES
MoM's configuration information can be contained in configuration
files of three types: 
.I default, PBS-prefixed, 
and 
.I site-defined.  
The
default configuration file is usually PBS_HOME/mom_priv/config.  The
"PBS" prefix is reserved for files created by PBS.  Site-defined
configuration files are those created by the site administrator.
MoM reads the configuration files at startup and reinitialization.  
The files are processed in this order:
.br
     The default configuration file
.br
     PBS-prefixed configuration files
.br
     Site-defined configuration files
.br

The contents of a file read later override the contents of a file read earlier.
For example, to change the cpuset flags, create a script "update_flags"
containing only
.RS 4
.B cpuset_create_flags <new flags>
.RE

then use the 
.I -s insert
option:
.RS 4
.B pbs_mom -s insert update_script update_flags
.RE
This adds the configuration file "update_script".
Configuration files can be added, deleted and displayed using
the 
.I -s
option.  

MoM's configuration files can use either the syntax shown 
below under 
.B Default Syntax and Contents
or the syntax for describing 
.I vnodes
shown in 
.B Vnode Syntax.

.B Location
.br
The default configuration file is in PBS_HOME/mom_priv/.

PBS places PBS-prefixed and site-defined configuration files 
in an area that is private to each installed instance of PBS.
This area is relative to the default PBS_HOME.  Note that the 
.I -d 
option changes where MoM looks for PBS_HOME.

The 
.I -c
option will change which default configuration file MoM reads.

Site-defined configuration files can be moved from one installed
instance of PBS to another.  Do not move PBS-prefixed configuration
files.  To move a set of site-defined configuration files from one
installed instance of PBS to another:

.IP "1" 5
Use the 
.I -s list 
directive with the "source" instance of PBS to enumerate the 
site-defined files.

.IP "2" 5
Use the 
.I -s show
directive with each site-defined file of the "source" instance of PBS
to save a copy of that file.

.IP "3" 5
Use the 
.I -s insert 
directive with each file at the "target" instance of PBS 
to create a copy of each site-defined configuration file.
.LP

.B Vnode Configuration File Syntax and Contents
.br
Configuration files with the following syntax describe vnodes and
the resources available on them.  They do not contain initialization 
values for MoM.
See the 
.B PBS Professional Administrator's Guide
for a definition of 
.I vnodes.
PBS-prefixed configuration files use the following syntax.  Other
configuration files can use the following syntax.  

Any configuration file containing vnode-specific assignments must
begin with this line:
.RS 4
.B $configversion 2
.RE
The format a file containing vnode information is:
.RS 4
.I <ID> : <ATTRNAME> = <ATTRVAL>
.RE
where
.RS 4
.IP "<ID>" 12
sequence of characters not including a colon (":")

.IP "<ATTRNAME>" 12
sequence of characters beginning with alphabetics or numerics, which
can contain underscore ("_") and dash ("-")

.IP "<ATTRVAL>" 12
sequence of characters not including an equal sign ("=")
.LP
The colon and equal sign may be surrounded by spaces.
.RE

A vnode's 
.I ID 
is an identifier that will be unique across all
vnodes known to a given 
.B pbs_server 
and will be be stable across
reinitializations or invocations of 
.B pbs_mom.  
ID stability is
of importance when a vnode's CPUs or memory might be expected
to change over time and PBS is expected to adapt to such changes
by resuming suspended jobs on the same vnodes to which they
were originally assigned.  Vnodes for which this is not a
consideration may simply use IDs of the form "0", "1", etc.
concatenated with some identifier that ensures uniqueness across
the vnodes served by the 
.B pbs_server.

A 
.I natural vnode 
does not correspond to any actual hardware.  It is used to define
any placement set information that is invariant for a given host, 
such as pnames.

It is defined as
follows:
.br
.IP "" 5
The name of the natural vnode is, by convention,
the MoM contact name, which is usually the hostname.
The MoM contact name is the vnode's MoM attribute.  See the
.B pbs_node_attributes(7B) man page.

.IP "" 5
An attribute, "pnames", with value set to the list of
resource names that define the placement sets' types for
this machine.

.IP "" 5
An attribute, "sharing" is set to the value "force_shared"
.LP

The 
.I natural vnode
is used to define any placement set information	that is invariant for
a given host (e.g. the placement set resource names themselves).

The order of the 
.I pnames
attribute follows placement set organization.  If
name X appears to the left of name Y in this attribute's value, an
entity of type X may be assumed to be smaller (that is, be
capable of containing fewer vnodes) than one of type Y.  No such
guarantee is made for specific instances of the types.

For example, on an HPE SGI machine named "HostA", with two vnodes, a natural
vnode, four processors and two cbricks, the description would
look like this:
.br
     HostA:  pnames = cbrick
.br
     HostA:  sharing = force_shared
.br
     HostA[001c02#0]:  sharing = default_excl
.br
     HostA[001c02#0]:  resources_available.ncpus = 2
.br
     HostA[001c02#0]:  resources_available.cbrick = cbrick-0
.br
     HostA[001c02#0]:  resources_available.mem = 1968448kb
.br
     HostA[001c04#0]:  sharing = default_excl
.br
     HostA[001c04#0]:  resources_available.ncpus = 2
.br
     HostA[001c04#0]:  resources_available.cbrick = cbrick-1
.br
     HostA[001c04#0]:  resources_available.mem = 1961328kb
.br
The natural vnode is described in the first two lines.
The first vnode uses cbrick-0, and the second one uses cbrick-1.

.B Default Syntax and Contents
.br
Configuration files with this syntax list local resources and
initialization values for MoM.  Local resources are either static,
listed by name and value, or externally-provided, listed by name and
command path.  See the
.I -c
option.

Each configuration item is listed on a single line, with its parts 
separated by white space.  Comments begin with a hashmark ("#").

The default configuration file must be secure.  It must be owned by a user ID
and group ID both less than 10 and must not be world-writable.

.B Externally-provided Resources
.br
Externally-provided resources use a shell escape to run a command.
These resources are described with a name and value, 
where the first character of the value is an exclamation mark ("!").
The remainder of the value is the path and command to execute.

Parameters in the command beginning with a percent sign ("%") can
be replaced when the command is executed.  
For example, this line in a configuration file describes a 
resource named "escape":
.RS 14
escape     !echo 0xx %yyy
.RE
.IP
If a query for the "escape" resource is sent with no parameter replacements, 
the command executed would be "echo 0xx %yyy".  If one parameter replacement is sent,
"escape[xxx=hi there]", the command executed would be "echo hi there %yyy".
If two parameter replacements are sent, "escape[xxx=hi][yyy=there]", the command
executed would be "echo hi there".  If a parameter replacement is sent with
no matching token in the command line, "escape[zzz=snafu]", an error
is reported.
.LP

.B Windows Notes
.br
If the argument to a MoM option is a pathname containing a space,
enclose it in double quotes as in the following:

hostn !"\\Program Files\\PBS Pro\\exec\\bin\\hostn" host

When you edit any PBS configuration file, make sure that you put a
newline at the end of the file.  The Notepad application does not
automatically add a newline at the end of a file; you must explicitly
add the newline.



.B Replacing Actions
.br
.IP "$action <default action> <timeout> <new action>" 5
Replaces the 
.I default action
for an event with the site-specified
.I new action.  
.I timeout
is the time allowed for 
.I new action 
to run.  See 
.B The PBS Professional Administrator's Guide.  
The 
.I default action 
can be one of:
.RS
.IP "checkpoint" 5
Run
.I new action 
in place of the periodic job checkpoint, after which the job 
continues to run.
.IP "checkpoint_abort" 5
Run
.I new action 
to checkpoint the job, after which the job must be terminated by the script.
.IP "multinodebusy <timeout> requeue" 5
Used with cycle harvesting and multi-vnode jobs.
Changes default behavior when a vnode becomes busy.  Instead of 
allowing the job to run, the job is requeued.  
.I timeout
is ignored.  The only
.I new action 
is 
.I requeue.  
.IP "restart" 5
Runs 
.I new action 
in place of 
.I restart.
.IP "terminate" 5
Runs 
.I new action 
in place of SIGTERM or SIGKILL when MoM terminates a job.
.RE

.SH Initialization Values
Initialization value directives have names beginning with a
dollar sign ("$").
See 
.B The PBS Professional Administrator's Guide.

.IP "$alps_client <path>" 5
Cray only.  MoM runs this command to get the ALPS inventory.  Must 
be full path to command.  
.br 
Format: path to command
.br
Default: None

.IP "$alps_release_timeout <timeout>" 5
Cray only.  Specifies the amount of time that PBS tries to release an
ALPS reservation before giving up.  After this amount of time has
passed, PBS stops trying to release the ALPS reservation, the job
exits, and the job's rsources are released.  PBS sends a HUP to the
MoM so that she re-reads the ALPS inventory to get the current
available ALPS resources.
.br
We recommend that the value for this parameter be greater than the value for 
.I suspectbegin.
.br
Format: Seconds, specified as positive integer.
.br
Default: 600 (10 minutes)

.IP "$checkpoint_path <path>" 5
MoM passes this path to checkpoint and restart scripts.
This path can be absolute or relative to PBS_HOME/mom_priv.
Overrides default.  Overridden by 
.I pbs_mom -C 
option and by 
.I PBS_CHECKPOINT_PATH 
environment variable.
.IP "$clienthost <hostname>" 5
.I hostname 
is added to the list of hosts which are allowed
to connect to MoM as long as they are using a privileged port.
For example, 
this allows the hosts "fred" and "wilma"
to connect to MoM:
.br
 "$clienthost      fred"
.br
 "$clienthost      wilma"
.br

The following hostnames are added to 
.I $clienthost 
automatically: the
server, the localhost, and if configured, the secondary server.  The
server sends each MoM a list of the hosts in the nodes file, and these
are added internally to 
.I $clienthost.  
None of these hostnames need to
be listed in the configuration file.

Two hostnames are always allowed to connect to 
.B pbs_mom, 
"localhost" and the name returned to MoM 
by the system call gethostname().  These
hostnames do not need to be listed in the configuration file.  

The hosts listed
as "clienthosts" make up a "sisterhood" of machines.  Any one of the
sisterhood will accept connections from within the
sisterhood.  The sisterhood must all use the same port number.

.IP "$cpuset_error_action <action>" 5
When using a cpuset-enabled MoM, specifies the action taken when 
a cpuset creation error occurs.  Can take one of the following values:
.RS 5
.IP continue 3
The error is logged and the job is killed and requeued.
.IP offline 3
The vnodes on this host for this job are marked
.I offline,
and the job is requeued.
.LP
.br
Format: String
.br
Allowable values: "continue", "offline"
.br
Default: "offline"
.RE


.IP "$cputmult <factor>" 5
This sets a 
.I factor 
used to adjust CPU time used by each job.  This allows adjustment of time
charged and limits enforced where jobs run on a system with
different CPU performance.  If MoM's system is faster than the
reference system, set
.I factor
to a decimal value greater than 1.0.  For example:
.RS 9
$cputmult 1.5
.RE
.IP
If MoM's system is slower, set 
.I factor 
to a value between 1.0 and 0.0.  For example:
.RS 9
$cputmult 0.75
.RE
.IP
.IP "$dce_refresh_delta <delta>" 5
Defines the number of seconds between successive refreshings of a job's
DCE login context.
For example:
.RS 9
$dce_refresh_delta 18000
.RE
.IP

.IP "$enforce <limit>" 5
MoM will enforce the given 
.I limit.
Some
.I limits
have associated values.  Syntax:
.br
.I $enforce <variable name> <value>
.br
See 
.B The PBS Professional Administrator's Guide.

.RS
.IP "$enforce mem" 5
MoM will enforce each job's memory limit.

.IP "$enforce cpuaverage" 5
MoM will enforce ncpus when the average CPU usage over a job's
lifetime usage is greater than the job's limit.

.RS
.IP "$enforce average_trialperiod <seconds>" 5
Modifies 
.I cpuaverage.
Minimum number of 
.I seconds 
of job walltime before enforcement begins.  Default: 120.  
Integer.

.IP "$enforce average_percent_over <percentage>" 5
Modifies 
.I cpuaverage.
Gives 
.I percentage
by which a job may exceed its ncpus limit.  Default: 50.
Integer.

.IP "$enforce average_cpufactor <factor>" 5
Modifies 
.I cpuaverage.
The ncpus limit is multiplied by 
.I factor 
to produce actual
limit.  Default: 1.025.  Float.
.RE


.IP "$enforce cpuburst" 5
MoM will enforce the ncpus limit when CPU burst usage exceeds
the job's limit.

.RS
.IP "$enforce delta_percent_over <percentage>" 5
Modifies 
.I cpuburst.
Gives
.I percentage
over limit to be allowed.  Default: 50.  Integer.

.IP "$enforce delta_cpufactor <factor>" 5
Modifies 
.I cpuburst.
The ncpus limit is multiplied by 
.I factor
to produce actual limit.  Default: 1.5.  Float.

.IP "$enforce delta_weightup <factor>" 5
Modifies 
.I cpuburst.
Weighting factor for smoothing burst usage when average is increasing.  Default: 0.4.
Float.

.IP "$enforce delta_weightdown <factor>" 5
Modifies 
.I cpuburst.
Weighting factor
for smoothing burst usage when average is decreasing.  Default: 0.4.
Float.
.RE
.RE
.IP "$ideal_load <load>" 5
Defines the 
.I load 
below which the vnode is not considered to be busy.
Used with 
the 
.I $max_load 
directive.  
No default.  Float.  
.RS
.IP "Example:" 5
$ideal_load 1.8
.LP
.br
Use of $ideal_load adds a static resource to the vnode called "ideal_load", 
which is only internally visible.
.LP
.RE

.IP "$jobdir_root <stage directory root>
Directory under which PBS creates job-specific staging and execution directories.
PBS creates a job's staging and execution directory when the job's 
.I sandbox
attribute is set to PRIVATE.  If 
.I $jobdir_root
is unset, it defaults to the job owner's home directory.  
In this case the user's home directory must exist.  
If 
.I stage_directory_root
does not exist when MoM starts up, MoM will abort.  If 
.I stage directory root
does not exist when MoM tries to run a job, MoM will kill the job.
Path must be owned by root, and permissions must be 1777.  On Windows,
this directory should have Full Control Permission for the local
Administrators group.
.RS
.IP "Example:" 5
$jobdir_root /scratch/foo
.RE

.IP "$kbd_idle <idle wait> <min use> <poll interval>" 5
Declares that the vnode will be used for batch jobs during periods when
the keyboard and mouse are not in use.  

The vnode must be idle for a minimum of 
.I idle wait
seconds before being considered available for batch jobs.  
No default.  Integer.

The vnode must be in use for a minimum of 
.I min use
seconds before it becomes unavailable for batch jobs.  Default: 10.  Integer.

Mom checks for activity every
.I poll interval
seconds.  Default: 1.  Integer.
.RS
.IP "Example:" 5
$kbd_idle 1800 10 5
.RE


.IP "$logevent <mask>" 5
Sets the 
.I mask 
that determines which event types are logged by 
.B pbs_mom.
To include all debug events, use 0xffffffff.
.nf
Log events:

Name       Hex Value  Message Category                   
---------------------------------------------------
ERROR      0001       Internal errors
SYSTEM     0002       System errors 
ADMIN      0004       Administrative events
JOB        0008       Job-related events
JOB_USAGE  0010       Job accounting info
SECURITY   0020       Security violations
SCHED      0040       Scheduler events
DEBUG      0080       Common debug messages
DEBUG2     0100       Uncommon debug messages
RESV       0200       Reservation-related info
DEBUG3     0400       Rare debug messages
DEBUG4     0800       Limit-related messages
.fi

.IP "$max_check_poll <seconds>" 5
Maximum time between polling cycles, in seconds.  Minimum recommended
value: 30 seconds.  See the 
.B PBS Professional Administrator's Guide
for usage.  

The interval between each poll starts at 
.I $min_check_poll 
and increases with each cycle until it reaches 
.I $max_check_poll, 
after which it remains the same. The amount by which the cycle increases is 1/20 of
the difference between 
.I $max_check_poll 
and 
.I $min_check_poll.
.br
Format: Integer
.br
Minimum value: 1 second
.br
Default value: 120 seconds

.IP "$max_load <load> [suspend]" 5
Defines the load above which the vnode is considered to be busy.
Used with 
the 
.I $ideal_load 
directive. No new jobs are started on a 
.I busy
vnode.

The optional 
.I suspend 
directive tells PBS to suspend jobs running on
the vnode if the load average exceeds the 
.I $ max_load 
number, regardless of the source of the load (PBS and/or logged-in users).
Without this directive, PBS will not suspend jobs due to load.

We recommend setting 
.I load
to a value that is slightly higher than the number of CPUs, 
for example 0.25 + 
.I ncpus.

.br
Default: number of CPUs on machine
.br
Format: Float  
.br
Example:
.RS 8
$max_load 3.5
.RE
.IP

.IP "$min_check_poll <seconds>" 5
Minimum time between polling cycles, in seconds.  Must be 
greater than zero and less than
.I $max_check_poll.  
Minimum recommended value: 10 seconds.
.br
Format: Integer.
.br
Minimum value: 1 second
.br
Default value: 10 seconds

.IP "$prologalarm <timeout>" 5
Defines the maximum number of seconds the prologue and epilogue
may run before timing out.  Default: 30 seconds.  Integer.
Example:
.RS 8
$prologalarm 30
.RE
.IP

.IP "$reject_root_scripts <True | False>" 5
When set to 
.I True,
MoM won't aquire any new hook scripts, and MoM won't run job scripts that would execute
as root or Admin. However, MoM will run previously-aquired hooks that run as root.
.br 
Format: Boolean
.br
Default: False

.IP "$restart_background <True | False>" 5
Controls how MoM runs a restart script after checkpointing a job.
When this option is set to 
.I True, 
MoM forks a child which runs the restart script.  The child returns
when all restarts for all the local tasks of the job are done.  MoM
does not block on the restart.  When this option is set to 
.I False,
MoM runs the restart script and waits for the result.
.br
Format: Boolean
.br  
Default: False


.IP "$restart_transmogrify <True | False>" 5
Controls how MoM runs a restart script after checkpointing a job.
When this option is set to 
.I True, 
MoM runs the restart script, replacing the session ID of the original 
task's top process with the session ID of the script.  

When this option is set to 
.I False,
MoM runs the restart script and waits for the result.  The restart
script must restore the original session ID for all the processes of
each task so that MoM can continue to track the job.  

When this option is set to 
.I False
and the restart uses an external command, the configuration parameter
.I restart_background
is ignored and treated as if it were set to 
.I True,
preventing MoM from blocking on the restart.
.br
Format: Boolean
.br
Default: False
.br

.IP "$restrict_user <True | False>" 5
Controls whether users not submitting jobs have access to this
machine.  If 
.I value
is 
.I True, 
restrictions are applied.  See 
.I $restrict_user_exceptions
and 
.I $restrict_user_maxsysid.
Not supported on Windows.
.br
Format: Boolean
.br
Default: False

.IP "$restrict_user_exceptions <user_list>" 5
Comma-separated list of users who are exempt from access
restrictions applied by 
.I $restrict_user.
Leading spaces within each entry are allowed.  
Maximum of 10 names.

.IP "$restrict_user_maxsysid <value>" 5
Any user with a numeric user ID less than or equal to 
.I value
is exempt from restrictions applied by 
$restrict_user.  

If 
.I $restrict_user 
is 
.I True 
and no 
.I value
exists for 
.I $restrict_user_maxsysid, 
PBS looks in /etc/login.defs, if it exists, for the 
.I value. 
Otherwise the default is used.

Integer.  Default: 999

.IP "$restricted <hostname>" 5
The 
.I hostname
is added to the list of hosts which are allowed to connect to MoM 
without being required to use a privileged port.  

Hostnames can be
wildcarded.  For example, to allow queries from any host from the 
domain "xyz.com":
.RS 9
$restricted      *.xyz.com
.RE
.IP
Queries from the hosts in the restricted list are only allowed 
access to information internal to this host, such as load
average, memory available, etc.  They may not run shell commands.

.IP "$suspendsig <suspend signal> [resume signal]" 5
Alternate signal 
.I suspend signal
is used to suspend jobs instead of SIGSTOP.  Optional 
.I resume signal
is used to resume jobs instead of SIGCONT.

.IP "$tmpdir <directory>" 5
Location where each job's scratch directory will be created.

PBS creats a temporary directory for use by the job, not by PBS.
PBS creates the directory before the the job is run and removes 
the directory and its contents when the job is finished.  It is 
scratch space for use by the job.  Permission must be 1777 on
Linux, writable by 
.I Everyone 
on Windows.

Example: 
.RS 9
$tmpdir /memfs
.RE

.IP
Default on Linux: /var/tmp
.br
Default on Windows: value of the
.I TMP
environment variable 

.IP "$usecp <hostname:source prefix> <destination prefix>" 5
MoM uses /bin/cp to deliver output files when
the destination is a network mounted file system, or when
the source and destination are both on the local host, or when
the 
.I source prefix 
can be replaced with the 
.I destination prefix
on 
.I hostname.  
Both
.I source prefix
and 
.I destination prefix
are absolute pathnames of directories, not files.  

Overrides 
.I PBS_RCP
and 
.I PBS_SCP.

Use trailing
slashes on both source and destination.  For example:
.RS 9
$usecp HostA:/users/work/myproj/ /sharedwork/proj_results/
.RE
.IP

.IP "$vnodedef_additive" 5
Specifies whether MoM considers a vnode that appeared previously
either in the inventory or in a vnode definition file, but that does
not appear now, to be in her list of vnodes.
.br
When 
.I $vnodedef_additive 
is True, MoM treats missing vnodes as if they
are still present, and continues to report them as if they are
present.  This means that the server does not mark missing vnodes as
.I stale.
.br
When 
.I $vnodedef_additive 
is False, MoM does not list missing vnodes,
the server's information is brought up to date with the inventory and
vnode definition files, and the server marks missing vnodes as 
.I stale.
.br
Visible in configuration file on Cray only.
.br
Format: Boolean
.br
Default for MoM on Cray login node: False


.IP "$wallmult <factor>" 5
Each job's walltime usage is multiplied by 
.I factor.
For example:
.RS 9
$wallmult 1.5
.RE
.IP

.RE

.B Cray-only Initialization Values
.br
.IP "pbs_accounting_workload_mgmt <value>" 5
Controls whether CSA accounting is enabled.  Name does not start
with dollar sign.  If set to "1", "on", or "true", 
CSA accounting is enabled.  If set to "0", "off", or 
"false", accounting is disabled.  Default: "true"; enabled.
.RE

.B HPE SGI-only Initialization Values
.br
.IP "cpuset_create_flags <flags>" 5
Lists the flags for when MoM does a cpusetCreate(3) for each job. 
.I flags
is an or-ed list of flags.  
The flags are:
.RS

.IP "HPE SGI formerly known as ICE, with Performance Software - Message Passing Interface" 5
CPUSET_CPU_EXCLUSIVE
.br
0
.br
Default: 0
.LP
.RE

.IP "cpuset_destroy_delay <delay>" 5
MoM waits up to
.I delay
seconds before destroying a cpuset of
a just-completed job, but not longer than necessary. 
This gives the operating system more time to clean up leftover processes
after they have been killed.

Example:
.RS 9
cpuset_destroy_delay 10
.RE

.IP
Default for HPE SGI machines: 0
.br
Format: Integer

.IP "memreserved <megabytes>" 5
.B Deprecated.  
The amount of per-vnode memory reserved for system overhead. 
This much memory is deducted from the value of 
.I resources_available.mem
for each vnode managed by this MoM.
.br
Example:
.RS 9
memreserved 16
.RE
.IP
Default: 0MB.  
.br

.RE
.B Static Resources
.br
Static resources local to the vnode are described
one resource to a line,
with a name and value separated by white space.
For example, tape drives of different types could be specified by:
.RS 15
.nf
.B tape3480 \ \  4
.B tape3420 \ \  2
.B tapedat  \ \ \ \ 1
.B tape8mm  \ \ \ \ 1
.fi
.RE


.RE

.SH FILES AND DIRECTORIES
.IP $PBS_HOME/mom_priv 10
Default directory for default configuration files.

.IP $PBS_HOME/mom_priv/config 10
MoM's default configuration file.

.IP $PBS_HOME/mom_logs 10
Default directory for log files written by MoM.

.IP $PBS_HOME/mom_priv/prologue 10
File containing administrative script to be run before job execution.

.IP $PBS_HOME/mom_priv/epilogue 10
File containing administrative script to be run after job execution.


.SH SIGNAL HANDLING
.B pbs_mom 
handles the following signals:

.IP SIGHUP 10
The 
.B pbs_mom 
daemon rereads its configuration files, closes and reopens the log
file, and reinitializes resource structures.  

.IP SIGALRM 10
MoM writes a log file entry.  See the 
.I -a alarm_timeout 
option.

.IP SIGINT 10
The 
.B pbs_mom 
daemon exits, leaving all running jobs still running.  
See the 
.I -p
option. 

.IP SIGKILL 10
This signal is not caught.  The 
.B pbs_mom 
daemon exits immediately.

.IP "SIGTERM, SIGXCPU, SIGXFSZ, SIGCPULIM, SIGSHUTDN" 10
The 
.B pbs_mom 
daemon terminates all running children and exits.

.IP "SIGPIPE, SIGUSR1, SIGUSR2, SIGINFO" 10
These are ignored.

.LP
All other signals have their default behavior installed.

.SH EXIT STATUS
.IP "Greater than zero" 5
If the 
.B pbs_mom 
daemon fails to start
.br
If the 
.I -s insert 
option is used with an existing 
.I scriptname
.br
If the administrator attempts to add a script whose name 
begins with "PBS"
.br
If the administrator attempts to use the 
.I -s remove 
option on a nonexistent configuration file, or on a configuration
file whose name begins with "PBS"
.br
If the administrator attempts to use the 
.I -s show
option on a nonexistent script


.SH SEE ALSO
The
.B PBS Professional Administrator's Guide, 
pbs_server(8B), 
pbs_sched(8B), 
qstat(1B)