Date Added: October 29, 2007

TWS LL - TWS LoadLeveler Service Update 3.4.2.1 for AIX 5L and Linux is available.

Notes:
-TWS LoadLeveler 3.4.2.1 is a mandatory service update to be installed with TWS LoadLeveler 3.4.2.0.
-The TWS LoadLeveler scheduling affinity support has been enhanced to utilize the performance benefits from SMT processor core topology available on SMT-capable IBM POWER5 or POWER6 processor-based systems. Jobs can request TWS LoadLeveler to schedule and attach CPUs for their tasks to processor cores in addition to MCMs. Tasks of jobs requesting MCM task affinity share the processors in an MCM with other tasks in the same job. In some instances, this may cause two tasks to run on the same core (in separate SMT threads). If the application intends to have each task running on a distinct core, then the "task_affinity=core" keyword should be added to the job's JCF.
-Additional information relating to this update can be found at http://www14.software.ibm.com/webapp/set2/sas/f/loadleveler

Date Added: August 20, 2007

TWS LL - An error was introduced in TWS LoadLeveler 3.4.1.2 which causes TWS LoadLeveler to lose reservation and fair share information following a recycle of TWS LoadLeveler nodes running the schedd daemon.

Users Affected:
All installations that use the reservation or fair share features of TWS LoadLeveler.

Issue:
The error causes reservation and fair share data to be unretrievable from the corresponding spool file when the TWS LoadLeveler schedd daemon is re-started.

Solution:
Apply apar IZ03334 efix.
Efix rpms for all linux platforms supported by TWS LoadLeveler and an emergency package for AIX may be obtained by calling IBM service.

Date Added: June 20, 2007

TWS LL - An error was introduced in all 32 bit linux ports of TWS LoadLeveler 3.4.1.1 which can cause TWS LoadLeveler jobs to fail.

Users Affected:
All installations that use 32 bit linux ports of TWS LoadLeveler 3.4.1.1.

Issue:
The error causes user process limits to be set to uninitialized values, which can cause application failures.
When the uninitialized value is very small, the user application may terminate abnormally due to exceeding the small limit.

Solution:
Apply apar IZ00385 efix rpms which are available from IBM service for the following platforms:

x86_redhat_4.0.0
x86_redhat_3.0.0
x86_sles_10.0.0
x86_sles_9.0.0

Date Added: April 04, 2007

The "smt" keyword is defaulted to "no" under LoadLeveler 3.4.0.0 and 3.4.0.1.

The "smt" keyword is defaulted to "no" under LoadLeveler 3.4.0.0 and 3.4.0.1.
This may cause jobs to have degraded performance if SMT is enabled on machines in
the LoadLeveler cluster.

For more information go to:
LL 3.4.0.1 defaults to "SMT=no"