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IBM::LoadLeveler - Data Access API
use IBM::LoadLeveler;
$version = ll_version();
# Data Access API functions
$query = ll_query( JOBS|MACHINES|CLUSTER|WLMSTAT|MATRIX|CLASSES|RESERVATIONS|MCLUSTERS|BLUE_GENE|FAIRSHARE );
$return = ll_set_request( $query,QUERY_ALL|QUERY_JOBID|QUERY_STEPID|\
QUERY_GROUP|QUERY_CLASS|QUERY_HOST|QUERY_STARTDATE|QUERY_ENDDATE|\
QUERY_PROCID|QUERY_RESERVATION_ID|QUERY_BG_JOB|QUERY_BG_PARTITION|\
QUERY_BG_BASE_PARTITION|QUERY_TOP_DOG, \@filter,ALL_DATA|Q_LINE|STATUS_LINE );
$object = ll_get_objs( $query, LL_STARTD|LL_SCHEDD|LL_CM|LL_MASTER|\
LL_STARTER|LL_HISTORY_FILE, $hostname, $number_of_objs, $error_code);
$return = ll_reset_request( $object );
$next_object = ll_next_obj ( $object );
$return = ll_free_objs ( $object );
$return = ll_deallocate ( $object );
$result = ll_get_data( $object, $LLAPI_Specification );
A minimal example of using the Data Access API is:
use IBM::LoadLeveler;
# Query Job information
$query = ll_query(JOBS);
# Ask for all data on all jobs
$return=ll_set_request($query,QUERY_ALL,undef,ALL_DATA);
if ($return != 0 )
{
print STDERR "ll_set_request failed Return = $return\n";
}
# Query the scheduler for information
# $number will contain the number of objects returned
$job=ll_get_objs($query,LL_CM,NULL,$number,$err);
while ( $job)
{
# Get the Job submit time
$SubmitTime=ll_get_data($job,LL_JobSubmitTime);
$job=ll_next_obj($query);
}
# Free up space allocated by LoadLeveler to hold the job object
ll_free_objs($job);
# Free up space used by the Query Object
ll_deallocate($query);
The Data Access API has the following functions:
$query = ll_query( JOBS | MACHINES | CLUSTER | WLMSTAT | MATRIX | CLASSES | RESERVATIONS | MCLUSTERS | BLUE_GENE | FAIRSHARE);
ll_query is the first call you make to access the API it establishes the type of information you receive.
Note:
$return=ll_set_request($query,$QueryFlags,$ObjectFilter, $DataFilter);
ll_set_request is used to determine the range of data returned by ll_get_objs.
The return from ll_query
The permissable Query Flags depends on the type of query being made. The flags are:
They can be used with the following query types:
Query Type Permitted Flags
-------------------------------
BLUE_GENE QUERY_ALL QUERY_BG_BASE_PARTITION QUERY_BG_PARTITION
CLASSES QUERY_ALL QUERY_CLASS
CLUSTER QUERY_ALL
FAIRSHARE QUERY_ALL QUERY_USER QUERY_GROUP
JOBS QUERY_ALL QUERY_BG_JOB QUERY_CLASS QUERY_ENDDATE QUERY_GROUP QUERY_HOST QUERY_JOBID QUERY_RESERVATION_ID QUERY_STARTDATE QUERY_STEPID QUERY_USER QUERY_TOP_DOG
MACHINES QUERY_ALL QUERY_HOST
MATRIX QUERY_ALL QUERY_HOST
MCLUSTERS QUERY_ALL
RESERVATIONS QUERY_ALL QUERY_BG_BASE_PARTITION QUERY_GROUP QUERY_HOST QUERY_RESERVATION_ID QUERY_USER
WLMSTAT QUERY_STEPID
Specifies the search criteria:
Query Flag Filter Description
---------------------------------------
QUERY_ALL undef
QUERY_JOBID Array reference of job IDs eg ["host.jobid1", "host.jobid2"]
QUERY_STEPID Array reference of step IDs eg ["host.jobid.stepid"]
QUERY_USER Array reference of user IDs eg ["mike", "mark", "mary"]
QUERY_CLASS Array reference of LoadLeveler class names.
QUERY_GROUP Array reference of LoadLeveler group names.
QUERY_HOST Array reference of LoadLeveler host names.
QUERY_STARTDATE or QUERY_ENDDATE two start dates or two end dates having the format MM/DD/YYYY eg ["01/14/2003", "02/23/2003"].
QUERY_PROCID Array reference containing a single process id terminated by a NULL string eg ["procid",NULL].
QUERY_RESERVATION_ID Array reference containing a list of reervation IDs.
QUERY_BG_BASE_PARTITION Array reference of base partition IDs. For all base partitions, the first entry in the list must contain the string "all"
QUERY_BG_PARTITION Array reference of partition IDs. For all base partitions, the first entry in the list must contain the string "all"
QUERY_TOP_DOG Array reference of job step
QUERY_PROCID is currently broken, some of the return fields don't return a value and it does not work at all with GANG scheduling. APAR is IY48329
Filters the amount of data you get back from the query. Permitted values are:
Valid only for a JOBS query, not using the history file, returns the same data as llq -f
Valid only for a MACHINES query, returns the same data as llstatus -f
$return=ll_reset_request($query);
This is used to reset the request (surprise!) associated with a query object, you use it if you want to do another ll_set_request using different parameters.
$data=ll_get_objs($query,$query_daemon,$host,$number,$err);
Sends a query request to LoadLeveler
Data from ll_query
The LoadLeveler Daemon you want to query, permitted values are:
Should be NULL unless you are querying LL_STARTD or LL_SCHEDD and want to query a machine other than the localhost. If you are querying LL_HISTORY_FILE then this should be the name of the history file.
The number of query objects returned.
If there is an error this is it. Possible values are:
$data=ll_get_data($element,$specification);
This call differs from the IBM documentation, the data you request is returned as the return value and not as a third parameter eg
$lav=ll_get_data($machine,LL_MachineLoadAverage); # Returns a double
@msl=ll_get_data($machine,LL_MachineStepList); # Returns an array of strings.
To know what you are getting you really need to know about the LoadLeveler Job Object Model. All of this is in the IBM LoadLeveler for AIX 5L: Using and Administering book and html. Sorry for not including it here, but there is an awful lot of it.
-head3 enum types
Returns from some query types may be, in C terms, enumerated types. In perl these all return as SCALAR Integers. Return values are shown below:
SHARED, NOT_SHARED, SLICE_NOT_SHARED
NO_HOLD, HOLDTYPE_USER, HOLDTYPE_SYSTEM, HOLDTYPE_USERSYS
SHARED, NOT_SHARED, SLICE_NOT_SHARED
STATE_IDLE, STATE_PENDING, STATE_STARTING, STATE_RUNNING,
STATE_COMPLETE_PENDING, STATE_REJECT_PENDING, STATE_REMOVE_PENDING,
STATE_VACATE_PENDING, STATE_COMPLETED, STATE_REJECTED, STATE_REMOVED,
STATE_VACATED, STATE_CANCELED, STATE_NOTRUN, STATE_TERMINATED,
STATE_UNEXPANDED, STATE_SUBMISSION_ERR, STATE_HOLD, STATE_DEFERRED,
STATE_NOTQUEUED, STATE_PREEMPTED, STATE_PREEMPT_PENDING,
STATE_RESUME_PENDING
$job=ll_next_obj($query);
This returns the next object from the query object.
$return=ll_free_objs($query);
This frees up the the space taken by the ll_get_objs routine for the LoadLeveler Data. Since there is probably an awful lot of this this is a very important call.
$return=ll_deallocate($query);
Frees the query object itself, this is the last LoadLeveler action.
These two requests are supposed to return integer arrays. In this module they will return lists.
This will return a list with LL_MachinePoolListSize elements in it.
This will return a list with LL_AdapterTotalWindowCount elements in it.
The Blue Gene arrays are all 3 elements in size.
Mike Hawkins <mike@pink-pit.com>
LoadLeveler perl. IBM LoadLeveler for AIX 5L: Using and Administering
