What's new in IBM Spectrum LSF Simulator

What's new in LSF Simulator 10.1.

Download location

Download any IBM Spectrum LSF Simulator 10.1 fix pack from IBM Fix Central. For more information, see Getting fixes from IBM Fix Central.

Support for previous IBM Spectrum LSF versions

To ensure the latest Fix Pack for IBM Spectrum LSF Simulator 10.1 works properly with your previous version of IBM Spectrum LSF 10.1, you must configure the following parameters in the lsf.conf file that was imported from the production cluster:

LSF_STRICT_CHECKING=N
LSF_AUTH_QUERY_COMMANDS=N

Determine the installed version of IBM Spectrum LSF Simulator

To verify the version of IBM Spectrum LSF Simulator, run the bcogn command with the -V option; for example, this output shows IBM Spectrum LSF Simulator 10.1 Fix Pack 15:

$ ./bcogn -V
IBM Spectrum
LSF Simulator 10.1.0.15  Build number,
Copyright International Business Machines Corp. 1992, 2025
US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
Portions Copyright 1991, 1999 Free Software Foundation, Inc.

Fix Pack 15

Operating system support

As of Fix Pack 15, RHEL 8.10 and 9.5 are newly certified for LSF Simulator on a Linux x64 kernel.

Client browser support

As of Fix Pack 15, you can use LSF Simulator on these upgraded browsers:

• For RHEL and Ubuntu:

  Browser	Version	Support
  Google Chrome	134	Certified
  Mozilla Firefox	128	Certified

• For Windows 10 and 11:

  Browser	Version	Support
  Google Chrome	133	Certified
  Mozilla Firefox	136	Certified
  Microsoft Edge	134	Supported

Upgraded software included with LSF Simulator

LSF includes various software, required for LSF Simulator components, as applicable for each operating system. This software is included with the LSF installation. To proactively address known security vulnerabilities, Fix Pack 15 upgraded the following software to ensure a secure environment:

Software	Version
Click	8.1.7
Flask	3.1.0
Gunicorn	23.0.0
Jinja2	3.1.4
MatplotSafe	3.0.2
NumPy	1.26.4
Pandas	2.4.4
Python	3.11
RedHat container image	8.10
SciPy	1.13.0
Urllib3	1.26.19

List of fixes

LSF Simulator 10.2 Fix Pack 15 resolves the following reported issues and necessary enhancements:

Description
Support live LSF environment with dummy workload tracing for new LSF Simulator experiments.
LSF Simulator ignores the license limits defined in the lsf.resources file.
Check configuration report error, where the lsadmin command cannot be found.
Unable to import cluster configuration if LSF_CONFDIR is commented out but pointing to an incorrect path in the lsf.conf file.
LSF Simulator does not support the #INCLUDE macro in LSF configuration.
Enhance the LSF Simulator known issues.

Fix Pack 14

Operating system versions

As of Fix Pack 14, RHEL 8.x and 9.x are newly certified for LSF Simulator on Linux x64 kernel. You can also continue to use RHEL 7.9.

Client browser

As of Fix Pack 14, you can use LSF Simulator on these upgraded browsers:

• For RHEL and Ubuntu:

  Browser	Version	Support
  Google Chrome	102	Certified
  Mozilla Firefox	113	Certified

• For Windows:

  Browser	Version	Support
  Google Chrome	111	Certified
  Mozilla Firefox	111	Certified

Display version in LSF Simulator web console header

You can now see the LSF Simulator version (such as IBM Spectrum LSF Simulator 10.1.0.14) in the header of LSF Simulator web console.

List of fixes

LSF Simulator 10.2 Fix Pack 14 resolves the following reported issues:

Description
Upgrade fails when there are existing stopped containers.
Symbolic linking support required for files under the lsf/conf directory.
Importing LSF configuration fails when the root user does not have writer permission to the conf directory.
Special directories are excluded when importing LSF configuration.

Fix Pack 13

Password change at first logon of the LSF Simulator web console

For added security, the first time you log on to the LSF Simulator web console, you will now be prompted to change your password, rather than use the preset default password (Admin).

Experiment graphs

To show a graphical representation of your experiments, use the new Graphs tab view in the IBM Spectrum LSF Simulator web console.

Symbolic linking for loading LSF configuration

Now, when IBM Spectrum LSF Simulator loads LSF configuration, it can process and handle symbolic links. If there are symbolic links in the LSF conf/ directory, when IBM Spectrum LSF Simulator loads the LSF configuration, it takes it from each symbolic link and loads that content to IBM Spectrum LSF Simulator. IBM Spectrum LSF Simulator no longer requires connecting to the original LSF conf/ directory, as it uses the symbolic link to connect instead.

Updated Elasticsearch

The built-in supported Elasticsearch version for IBM Spectrum LSF Simulator 10.1 Fix Pack 13 has been upgraded to from version 7.10 to 7.16.3, with the JDK also upgraded from version 17.0.1 to 17.0.3.1. For details about installing IBM Spectrum LSF Simulator with the built-in Elasticsearch, see Installing IBM Spectrum LSF Simulator.

General availability (version 10.1 with no fix packs)

Workload distribution charts

You can now view workload snapshot job distributions across queues, runtime, memory and slots usage. This can help you decide the time compression factor when starting an experiment.

Dynamic time compression

You can now choose Let system decide when selecting time compression, and LSF Simulator finds the optimal time compression factor based on the workload.

Experiments with the current time as the event time

You can now choose Current time as the experiment event time, so the new experiment event is recorded as the current time instead of the original event time.

Accessibility improvements

The LSF Simulator console now features improvements for accessibility.

SLMTag support

LSF Simulator uses the virtual server license model, which requires SLMTag file for audition. LSF Simulator now includes a tag file.