GlideinWMS The Glidein-based Workflow Management System

Logical name of the Grid site where the glidein is running. This information is published both in the startd ClassAd and in the user job environment.

HTCondor expression to use to specify when a user job in the glideins should be held. If any expression is true, the glidein is held. This is usually done to specify "bad" jobs, such as those that claim too much memory.

HTCondor expression to use to specify when a user job in the glideins should be preempted. If any expression is true, the glidein is preempted. This is usually done to specify custom preemption policies for user jobs.

Used in calculating the HTCondor RANK

They are summed together, and the user job with the largest rank will run first.

Max amount of time a condor_startd will wait to be matched before giving up and terminating.

Max amount of time a condor_startd will wait after having already completed a job to be matched again. (i.e. the tail of a job).

How long the condor_startd be running before no longer accepting jobs.
The random spread is used to improve the efficiencies, so the actual value used by HTCondor will be anywhere between GRT-GRTS and GRT.

NOTE: if GLIDEIN_Max_Walltime is specified, then this value is ignored and the retire time is calculated (see GLIDEIN_Max_Walltime below)

Max allowed time for the glidein.
This variable is optional. If you specify this variable, then HTCondor startup scripts will calculate the GLIDEIN_Retire_Time for the glidein as GLIDEIN_MAX_Walltime - GLIDEIN_Job_Max_Time. If GLIDEIN_Retire_Time is also specified, it will be ignored and only the calculated value is used. Note that if GLIDEIN_Job_Max_Time is specified but is greater than GLIDEIN_Max_Walltime or does not allow enough time for graceful shutdown, it will be reduced by the glidein. See Lifetime of a glidein for details.

Once DAEMON_SHUTDOWN is reached and the glidein pilot enters the Retiring state, this amount passes to allow the startd and job to gracefully shutdown before forcefully terminating the glidein. See Lifetime of a glidein for details.

Ability to control whether the pseduo-interactive monitoring slot is started on the worker node. Set to False if you do not want the monitoring slot started.

Special purpose resources added in separate slots or the main slot of the glidein. The separate slots will never be available for the regular jobs. This string is a semicolon separated list of comma separated resource descriptions. Each resource description contains the name (case insensitive) and optionally the number of resource instances (default is 1 (*)), the total memory reserved (default is 128MB times the number of resources), a type to control how the resource is handled (see below for more), and the disk reserved (default is auto, where HTCondor splits evenly). Possible type values are:

• main - the resource is added to the main slot
• extra - the resource is added to the main slot with virtual CPUs
• partitionable - the resource has a new dedicated slot with virtual CPUs
• static - the resource has many dedicated slots (one per instance) with a virtual CPU each

The default type is partitionable, unless there is only one resource instance, then is static. When adding resources to the main slots (type is main or extra): the memory and disk parameters are ignored; HTCondor splits automatically resources depending on the number of CPUs and having a partitionable main slot or not; if the number of resources is not equal (or an exact multiple) to the number of CPUs, then you must select partitionable slots for the Glideins (slots_layout="partitionable" in the config/submit section of the entry configuration or SLOTS_LAYOUT partitionable in the Frontend configuration) otherwise the startd may fail due to impossible configuration. When adding resources to the main slots, regular jobs (not using the resource) may use all memory and CPUs (including the virtual ones). Only separate slots (type is partitionable or static) reserve CPUs and memory. Check the HTCondor manual to learn more on how resources are split.

The parameters in a resource description can be listed or specified using their name: name, number, memory, type, disk (see the last example below).

Characters may be appended to a numerical value of memory to indicate percentage (%) or units. K or KB indicates KiB, $2^{10}$ numbers of bytes. M or MB indicates MiB, $2^{20}$ numbers of bytes. G or GB indicates GiB, $2^{30}$ numbers of bytes. T or TB indicates TiB, $2^{40}$ numbers of bytes. Disk space must be a fraction or percentage: 1/4, 25%. auto lets HTCondor do the splitting. Check the HTCondor manual for more about resource splitting.

Jobs submission must use request_RESOURCE=N with N>0 to use these slots or to use the resource in the main slot, e.g. request_ioslot=1

Examples:

• value="ioslot,2,200,static" creates statically partitioned 2 ioslot resources with 100MB memory each.
• value="ioslot" creates 1 ioslot resource with 128MB
• value="ioslot,2,disk=1GB;monitor;GPUs,3,,main" creates (1) a partitionable slot with 2 ioslot resources, 256MB total memory and 1GB total disk (2) 1 monitor slot resource with 128MB memory (3) adds 3 GPUs to the main slot/slots
• value="GPUs,type=main" discovers (*) how many GPUs are available and adds them to the main slot

(*) GPUs is a special resource name. If no number is specified, the glidein will invoke HTCondor's GPU discovery mechanism and get the number from there, which could be 0 if there are no GPUs. Your job will find in the HTCondor ClassAd also all the special attributes about the GPUs. If no number is specified and the auto-discovery fails 0 GPUs are assumed. Since you don't know the number of GPUs that will be added to the main slot, the slot_layout must be partitionable.

If set, HTCondor will launch all user jobs via glexec, thus running the job under the appropriate local account. This is important both for GlideinWMS security and for accounting purposes.
A special value of "OSG" can be used to automatically find the locally installed gLExec on OSG worker nodes.

This variable is renamed to GLEXEC in the condor config.

If set to False, the condor_starter is run sharing the same UID as the user job. This has security implications.

NOTE: It is recommended to turn this on and have the condor_starter be protected from the user jobs.

Should process group monitoring be enabled?

This is a HTCondor optimization parameter. Unfortunately, it negatively interferes with the batch systems used by the Grid sites, so it should not be turned on unless you have a very good reason to do so.

If True, forces the glidein to use TCP updates.
The collector must be configured in the same way for this to work.

Also see the HTCondor documentation for implications and side effects.

If True, enable the startd UDP command socket (HTCondor default).

Using the UDP command socket is a HTCondor optimization that makes working over firewalls and NATs very difficult. It is thus recommended you leave it disabled in the glideins.

Please note if you leave it disabled, that you must configure the schedd with
SCHEDD_SEND_VACATE_VIA_TCP = True
and the negotiator with
NEGOTIATOR_INFORM_STARTD = False
to have a functional system.

If set to False, the schedd will be sending keepalives to the startd.

Setting this to True instructs the startd to send keepalives to the schedd. This improves the glidein behavior when running behind a firewall or a NAT.

Please note that the schedd must be configured in the same way for this to work.

Security related settings. Please notice that the glideins always require GSI authentication.

For more details see the configuration page or the HTCondor manual.

Another security setting.

If set to True, the schedd and the startd will use a low overhead protocol. See the configuration page or the HTCondor manual.

What is the maximum size the logs should grow.

Setting them too low will made debugging difficult.
Setting them too high may fill up the disk in anomalous situations, both on the work nodes and on the glidein Factory.

If set to True, it will enable HTCondor Connection Brokering (CCB), which is needed if the glideins are behind a firewall or a NAT.

If set to True, it will enable the shared port daemon, which will reduce the number of connections between the glidein and the collectors.

Number of CPUs glidein should use. GLIDEIN_CPUS is used to set NUM_CPUS for the HTCondor started by the glidein. Use "slot" (or "auto") to let glidein determine this from the job slot assigned to the glidein, use "node" to let glidein determine this from the hardware of the worker node (e.g. if you are sure that only your job is running on the node), use a positive integer to set GLIDEIN_CPUS (and NUM_CPUS) to assume that value. Most of the time it is an integer, but the type is string to allow also the keywords. In case of static partitioning, glidein will create GLIDEIN_CPUS number of slots. In case of dynamic partitioning, the slots will be created automatically based on the CPUs required by the job and GLIDEIN_CPUS is the sum of the slots made available. Refer to HTCondor manual for info on NUM_CPUS

Number of CPUs glidein is expected to receive. GLIDEIN_ESTIMATED_CPUS is used only when GLIDEIN_CPUS is set to some auto-discovery value (auto/slot, node). With cores auto-discovery the Frontend assumes the entry will provide GLIDEIN_ESTIMATED_CPUS cores, 1 by default. The Frontend will work even if the estimate is not correct, anyway: it will trigger requests for the entry only if the CPUs requested by the jobs are no more than GLIDEIN_ESTIMATED_CPUS and, it will adjust the number of Glideins requested assuming GLIDEIN_ESTIMATED_CPUS cores from each Glidein in that entry. GLIDEIN_ESTIMATED_CPUS is not used by the Glidein. GLIDEIN_ESTIMATED_CPUS should be set only when GLIDEIN_CPUS is set to some auto-discovery value (auto/slot, node). It is a configuration error to set GLIDEIN_ESTIMATED_CPUS otherwise.

Amount of memory glidein should use. If set, GLIDEIN_MaxMemMBs is used to set total MEMORY used for the HTCondor Startd and jobs started by the glidein. If GLIDEIN_MaxMemMBs is not set and GLIDEIN_MaxMemMBs_Estimate is TRUE, GLIDEIN_MaxMemMBs is calculated based on the memory available on the worker node. If GLIDEIN_MaxMemMBs is not set and GLIDEIN_MaxMemMBs_Estimate is not TRUE (False or unset), the glidein lets HTCondor decide the amount of memory. Refer to HTCondor manual for info on MEMORY

Used in conjunction with GLIDEIN_MaxMemMBs. It is ignored if GLIDEIN_MaxMemMBs is set to any value. See GLIDEIN_MaxMemMBs for the description.

This attribute regulates advertising of validation failures to the Factory collector.

• NEVER - The glidein will just fail, and do nothing.
• ALIVEONLY - The glidein will advertise a Master ClassAd in Drained state and Retiring activity for the lifetime of the glidein script.
• ALWAYS - Similar to ALIVEONLY, but will also send a final ClassAd in Drained state and Killing activity just before dying.

When advertised, the classad is flagged GLIDEIN_Failed=True, the error is recorded in the GLIDEIN_FAILURE_REASON and GLIDEIN_EXIT_CODE attributes, and the failing script is recorded in the GLIDEIN_LAST_SCRIPT attribute.

Logical name of the Glidein Factory machine (like “osg1”).

Identification name of the Glidein Factory instance (like “v1_0”).

Identification name of the entry point (like “ucsd5”).

Type of Grid resource (like “gt2”).

URI of the Grid gatekeeper (like “osg1.ucsd.edu/jobmanager-pbs”)

Optional RSL string (like "(condor_submit=('+ProdSlot' 'TRUE'))")

Optional URL of the site Web proxy.

A special value “OSG” can be used to automatically discover the local Web proxy on OSG worker nodes.

This variable is exported as GLIDEIN_Proxy_URL to the use job environment.

This setting can be either:

• “std” - Default mode, where all interesting debug information is reported back to the Glidein Factory and the glidein will wait 20 minutes on a worker node that failed validation to minimize the black hole effect.

• “nodebug” - Disable most diagnostic messages. This can be useful for very stable setups. The glidein still waits 20 minutes on a worker node that failed validation to minimize the black hole effect.

• Fast – All debugging is enabled and the glidein waits only 2 minutes on a worker node that failed validation. This mode is useful when debugging a misbehaving Grid site.

Identification name of the VO Frontend request (like “ucsd5@v1_0@osg1@cms4”).

List of Collector URIs used by the VO Condor pool (like “cc.cms.edu:9620,cc.cms.edu:9621”).

One of the URIs in the list will be selected and used as HEAD_NODE in the condor_config.

Condor expression to use to specify when a user job in the glideins should be held. If any expression is true, the glidein is held. This is usually done to specify "bad" jobs, such as those that claim too much memory.

Condor expression to use to specify when a user job in the glideins should be preempted. If any expression is true, the glidein is preempted. This is usually done to specify custom preemption policies.

Used in calculating the Condor RANK

They are summed together, and the user job with the largest rank will run first.

True by default. Setting this to false will shorten the Glidein lifetime to be shorter than the Proxy lifetime. Use it if you expect the resource will not extend reliably the proxy lifetime. The Glidein lifetime will always be shorten if the Proxy lifetime is less than 900 s.

Max allowed time for the job to end.
This is used by the condor_startd. Once the GLIDEIN_Retire_Time expires, the glidein will allow the job to run for this amount of time before activating DAEMON_SHUTDOWN and killing the job. Note that, if GLIDEIN_Max_Walltime is specified, this variable could be reduced by the glidein in order to fit within Glidein_Max_Walltime. See Lifetime of a glidein for details.

If False, the user job environment will contain only glidein Factory provided variables.

If True, the user job environment will also contain the environment variables defined at glidein startup.

See JOB_INHERITS_STARTER_ENVIRONMENT documentation for more details.

By default, the glidein will unset the variable X509_USER_PROXY for security reasons to prevent the user jobs from accessing the pilot proxy. Setting this to true will override this behavior and keep the X509_USER_PROXY in the environment.

• fixed - create N single core slots, and split memory and disk equally mong them
• partitionable - start up with a single partitionable slot and let HTCondor do the spliting as needed

This attribute regulates advertising of validation failures to the user collector.

• NEVER - The glidein will just fail, and do nothing. (default)
• ALIVEONLY - The glidein will advertise a Machine ClassAd in Drained state and Retiring activity for the lifetime of the glidein script.
• ALWAYS - Similar to ALIVEONLY, but will also send a final ClassAd in Drained state and Killing activity just before dying.

When advertised, the classad is flagged GLIDEIN_Failed=True, the error is recorded in the GLIDEIN_FAILURE_REASON and GLIDEIN_EXIT_CODE attributes, and the failing script is recorded in the GLIDEIN_LAST_SCRIPT attribute.

CLAIM_WORKLIFE for non-dynamic slots. Defaults to -1 i.e. HTCondor will treat this as an infinite claim worklife and schedd will hold claim to the slot until jobs are preempted or user runs out of jobs.

CLAIM_WORKLIFE for dynamically partitionable slots. Defaults to 3600. This controls how frequently the dynamically partionable slots will coalesce.

Max lifetime of the VM. When this timer is reached the glideinwms-pilot service will terminate and glidein process, shutdown the glideinwms-pilot service and issue a VM shutdown

Disables VM from automatically shutting down after the glideinwms-pilot service has exited.
NOTE: This variable is for debugging purposes only and should not be set to True in the Production environment. Disabling auto shutdown could result in accumulating financial charges in case of paid clouds.

These variables contain the SHA1 signature of the signature files.

These signatures are used as a base to ensure the integrity of all the data downloaded in the glidein startup scripts, but they also provide a fingerprint of the configuration used by the glidein.

These variables are published both in the glidein ClassAd and in the user job environenmt.

The schedd used by the Glidein Factory to submit the glidein.

This variables is exported a GLIDEIN_Schedd both in the glidein ClassAd and to the user job environment.

The cluster and process id assigned by the Glidein Factory schedd to this glidein.

These variables are exported as GLIDEIN_ClusterId and GLIDEIN_ProcId both in the glidein ClassAd and to the user job environment.

Path to the directory that admin-provided scripts and user jobs can use for storing temporary data.

This variable is exported as GLIDEIN_Tmp_Dir both to the glidein ClassAd and to the user job environment.

Path to the directory on the local file system for storing temporary data.
Note: Only use for things that absolutely need the guarantee of residing in the local file system. Prefer TMP_DIR above for everything else.

This variable is exported to the user job environment.

File path to the condor vars files.

Admin-provided scripts may want to add entries to these files.

File path to the script containing the add_config_line and add_confir_vars line functions.

File path to the glidein proxy file.

File path to the Condor mapfile used by the glidein.

Path to the directory containing the trusted CAs' public keys and RSLs.

Directory where the glidein Condor binary distribution have been installed.

File path to the list of wrapper scripts used by the glidein.

This is the executable that glideins will run (ie what to put after "exec" in the condor job wrapper). By default, glideins will perform exec "\$@" to run the pilot. For other modes of execution, you may need different arguments. For example, to run a program under parrot, you may need exec "$GLIDEIN_PARROT/parrot_run" -t "$parrot_tmp" "$@" .
Note, the syntax of this command is very sensitive This needs to be double-escaped in order to function correctly. For the two examples listed above, you would need:

• "\\\"\\\$@\\\""
• "\\\"\\\$GLIDEIN_PARROT/parrot_run\\\" -t \\\"$parrot_tmp\\\" \\\"\\\$@\\\""

Number of processors which may be allocated to jobs. Typically the number of processors seen by the operating system on one worker node (that is the number of \processor :" lines in /proc/cpuinfo on Linux), but potentially set to more or less than this for performance reasons.

Total HS06 rating of the full machine in its current setup. HS06 is measured following the HEPiX recommendations, with HS06 benchmarks run in parallel, one for each processor which may be allocated to jobs.

Shutdown time for the machine as a UNIX time stamp in seconds. The value is dynamic and optional. If the file is missing, no shutdown is foreseen.

If the resource provider announces a shutdown time to the jobs on this host, that time will not be less than grace secs seconds after the moment the shutdown time is set. This allows jobs to begin packages of work knowing that there will be sufficient time for them to be completed even if a shutdown time is announced. This value is required if a shutdown time will be set or changed which will affect any jobs which have already started on this host.

Number of processors allocated to the current job.

Total HS06 rating for the processors allocated to this job. The job's share is calculated by the resource provider from per-processor HS06 measurements made for the machine.

Dynamic value. Shutdown time as a UNIX time stamp in seconds. If the file is missing no job shutdown is foreseen. The job needs to have finished all of its processing when the shutdown time has arrived.

If the resource provider announces a shutdowntime job to the job, it will not be less than grace secs job seconds after the moment the shutdown time is set. This allows jobs to begin packages of work knowing that there will be sufficient time for them to be completed even if a shutdown time is announced. This value is static and required if a shutdown time will be set or changed after the job has started.

UNIX time stamp in seconds of the time when the job started on the worker node. For a pilot job scenario, this is when the batch system started the pilot job, not when the user payload started to run.

A string of printable non-whitespace ASCII characters used by the resource provider to identify the job at the site. In batch environments, this should simply be the job ID. In virtualized environments, job id will typically contain the UUID of the VM.

Elapsed time limit in seconds, starting from jobstart secs. This is not scaled up for multiprocessor jobs.

CPU time limit in seconds. For multiprocessor jobs this is the total for all processes started by the job

Resident memory usage limit, if any, in bytes for all processes started by this job.

Swap limit, if any, in bytes for all processes started by this job.

Scratch space limit if any. If no quotas are used on a shared system, this corresponds to the full scratch space available to all jobs which run on the host. User jobs from EGI-registered VOs expect the \max size of scratch space used by jobs" value on their VO ID Card to be available to each job in the worst case. If there is a recognised procedure for informing the job of the location of the scratch space (eg EGI's $TMPDIR policy), then this value refers to that space.

An entry can control the use of Singularity by setting GLIDEIN_SINGULARITY_REQUIRE to NEVER (Singularity is not supported), OPTIONAL or PREFERRED (capable of Singularity but it is not enforced), REQUIRED (jobs must run with Singularity) or REQUIRED_GWMS (jobs must run with Singularity and use the GWMS wrapper scripts). This last option is the only one that really enforces Singularity, but is not compatible with VOs that currently self-manage Singularity with custom scripts, like OSG and CMS.

Determines whether or not Frontend/Group want to mandate the use of Singularity and is used both for provisioning and once the job is on the site. Possible values are: DISABLE_GWMS (disable GWMS Singularity machinery, not to interfere with independent VO setups - Default), or NEVER (do not use Singularity), or OPTIONAL or PREFERRED (use Singularity if the site is configured with it), or REQUIRED (always require Singularity). If REQUIRED, PREFERRED or OPTIONAL are used, the default wrapper script that we provide should be used (or a similar one). In other words a line like <file absfname="/var/lib/gwms-frontend/web-base/frontend/default_singularity_wrapper.sh" wrapper="True"/> should be added in the <files> section of the general or group parts of the Frontend configuration.

Is evaluated using GLIDEIN_Singularity_Use and GLIDEIN_SINGULARITY_REQUIRE and determines whether and how Singularity will be used. Possible values are: DISABLE (do not use the GWMS Singularity mechanisms), FAIL (do not provision on this entry, do not match with these Glideins or fail the Glidein), NEVER (do not use Singularity), PREFERRED (use Singularity but allow to fall-back to no Singularity if something goes wrong, e.g. no image is found), REQUIRED (use Singularity and fail the Glidein if it cannot run with Singularity).
See the Factory configuration document for a table of how Singularity is calculated using GLIDEIN_Singularity_Use and GLIDEIN_SINGULARITY_REQUIRE.

Tells the Glidein wheter Singularity is available. This is not set if GWMS_SINGULARITY_STATUS is DISABLE, it is set to 1 (true) if GWMS_SINGULARITY_STATUS is PREFERRED or REQUIRED, and it is set to 0 (false) otherwise. It can change to 0 if GWMS_SINGULARITY_STATUS is PREFERRED but the Singularity tests fail.

String-encoded comma separated key-value pair dictionary listing Singularity images. Keys cannot contain commas or colons. Values cannot contain commas. The keys are identifiers for a platform and the values are paths (or URLs) for the corresponding images, expressed in any format supported by Singularity. REQUIRED_OS is used to select the platform: the first platform in the list that matches a key will be used. You can use any string to identify the images as lons as you are consistent with REQUIRED_OS, but we recommend to use standard names like: rhel7 (for RHEL7 or SL7), rhel6 (fpr RHEL6 or SL6). The default set in generic_pre_singularity_setup.sh is "rhel6:/cvmfs/singularity.opensciencegrid.org/opensciencegrid/osgvo-el6:latest,rhel7:/cvmfs/singularity.opensciencegrid.org/opensciencegrid/osgvo-el7:latest" or by running a pre_singularity setup script. SINGULARITY_IMAGE_DEFAULT6, SINGULARITY_IMAGE_DEFAULT7, and SINGULARITY_IMAGE_DEFAULT are deprecated and will be ignored in the future. To ease the transition, these are currently added to SINGULARITY_IMAGES_DICT with keys rhel6, rhel7 and default, respectively.

Comma separated list of platforms accepted by the job. 'any' is a wildcard, means that any platform is OK. GWMS will intersect this list with GLIDEIN_REQUIRED_OS and use the intersection to select the Singularity image. The first value of the intersection for which there is a key in SINGULARITY_IMAGES_DICT will determin the image (value with that key). 'any' means that any Singularity image is OK.

Comma separated list of platforms accepted by the entry. See REQUIRED_OS.

Comma separated list of restrictions on the Singularity images. Possible values are: cvmfs (the image must be on cvmfs).

This is used to set Singularity bind mounts. It is a comma separated list of src[:dst[:opt]] elements. See GLIDEIN_SINGULARITY_BINDPATH

This is used to set Singularity bind mounts. It is a comma separated list of src[:dst[:opt]] elements, as you would express in the --bind option in Singularity. 'src' is the path on the system, 'dst' is the path in the Singularity image, 'opt' is a mount option (e.g. 'ro', for read-only mounts). See the Singularity for a description of the format and the supported options. Commas are not allowed in both the paths, and colons are not allowed in the 'src' path. GWMS combines in order GLIDEIN_SINGULARITY_BINDPATH, GLIDEIN_SINGULARITY_BINDPATH_DEFAULT, and a default list. The default list includes "/hadoop,/hdfs,/lizard,/mnt/hadoop,/mnt/hdfs", and "/cvmfs" (if GWMS_SINGULARITY_BIND_CVMFS is true) and some GPUs libraries (if GPUs are detected). The combined list is validated removing paths not existing (outside Singularity) and is passed as --bind option to singularity. Singularity prepends to the mounts list also the environment variable $SINGULARITY_BINDPATH (this could be set by the Site or by setup scripts on the worker nodes). Singularity will skip mounts where the destination path does not exist in the Singularity image selected. The suggestion is to set GLIDEIN_SINGULARITY_BINDPATH_DEFAULT in the Factory and GLIDEIN_SINGULARITY_BINDPATH in the Frontend.

/cvmfs is mounted in Singularity if this is 1 (true)

Extra options that will be added to the singularity invocation

List of DNs trusted by the glidein.

When is the proxy expected to expire.

If gLExec is used and this is set to True, the condor_starter will be run sharing the same UID as the user job.

If gLExec is used, this variable points to a trusted copy of a shell.

If gLExec is used, this variable points to the working directory under which all user jobs will be started.

The variable controls wether or not the glidein should accept new jobs. As part of the WLCG Machine / Job Features Task Force Site admins have the possibility to put worker nodes to "drain mode". In particular if the JOBFEATURES (or MACHINEFEATURES) environment variable is set and it points to a local directory containing a file named shutdowntime_job (shutdowntime), or $JOBFEATURES/shutdowntime_job ($MACHINEFEATURES/shutdowntime) is a valid URL (it is possible to wget it), then the glidein will stop accepting jobs. (see here). The SiteWMS_WN_Draining variable is periodically updated by means of the STARTD_CRON condor feature. See Draining glideins for details.

The variable controls wether or not the glidein should preempt jobs. This is still part of the WLCG Machine / Job Features Task Force (see above). The variable will become true if the shutdown time value contained in the file pointed by the JOBFEATURES (or MACHINEFEATURES) variable contains a timestamp (unix epoch time) that is less than 30 minutes in the future. If so PREEMPT_GRACE_TIME will be set to 20 minutes and the job will be preempted after that time if it does not exit. The SiteWMS_WN_Preempt variable is periodically updated by means of the STARTD_CRON condor feature. See Draining glideins for details.