Tivoli Workload Scheduler LoadLeveler

Get the most out of your computing resources

IBM® Tivoli® Workload Scheduler (TWS) LoadLeveler® enables users to run more jobs in less time

It is a parallel scheduling system that matches each job's processing needs and priority with available resources and special instructions for maximum resource utilization.

• Delivers tight control of resources: can limit use of individual machines to specific times, users or job classes, or can use machines only when the keyboard and mouse are inactive
• Tracks the total resources used by each serial or parallel job and offers several reporting options to track jobs and utilization by user, group, account or type over a specified time period
• Can incorporate machine speed to adjust chargeback rates and be configured to require an account for each job to support chargeback for resource use
• Offers both a command line interface and a graphical interface in addition to an API enabling user-written applications to control it
• Supports high-availability configurations to ensure reliable operation, and automatically monitors available compute resources to ensure that no jobs are scheduled to failed machines
• Integrates with AIX® Workload Manager (WLM) and the IBM High Performance Switch (HPS) for System p™ hardware, and includes an algorithm for the Blue Gene® machine BG/L
• "Solution Sheet: Maximize operational efficiencies and business resiliency"
• Operating systems supported: AIX, Linux

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Features, advantages and benefits

Features	Advantages	Benefits
Job Scheduling	Jobs are executed based on their priority, resource requirements and special instructions and not on the sequence of submission	Administrators can specify that long-running jobs run only on off-hours, that short-running jobs be scheduled around long-running jobs or that certain users or groups get priority. In addition, the resources themselves can be tightly controlled: use of individual machines can be limited to specific times, users or job classes or TWS LoadLeveler can use machines only when the keyboard and mouse are inactive
Easily scalable	Can easily scale up to thousands of processing nodes and thousands of parallel jobs in the job queue	Industrial strength, reliable and robust product. It is a completely distributed program with extensive failover and self-repair capabilities to survive even severe system events, usually without administrator intervention
Integration with IBM High Performance Switch (HPS) for pSeries® hardware	Integration with HPS for pSeries hardware extends the available resources	Enables immediate use of the scalable bandwidth and additional multitasking capabilities
Integration with AIX® Workload Manager (WLM)	Extends the capability of TWS LoadLeveler	Provides both resource specification on job start and resource utilization controls to prevent resource overuse by errant applications
Flexibility	Offers unprecedented flexibility with a complete array of APIs allowing a high level of site-specific customization	Offers job checkpointing and suspension with optional job cancellation, hold and re-queue. Provides great flexibility in defining real-time job and resource priority control

• Easily scalable to thousands of processing nodes and thousands of parallel jobs in the job queue, TWS LoadLeveler is an industrial-strength product that has been available on parallel computing platforms for 15 years.

• TWS LoadLeveler incorporates the latest technologies in parallel batch scheduling research. An early adopter of the backfill scheduling algorithm, IBM has continued to improve the speed, scalability and performance of this algorithm in TWS LoadLeveler.

• The first batch scheduler to offer a complete scheduling API, TWS LoadLeveler currently offers unprecedented flexibility with a complete array of APIs allowing a high level of site-specific customization.

• TWS LoadLeveler is a completely distributed program with extensive failover and self-repair capabilities to survive even severe system events, usually without administrator intervention.

• TWS LoadLeveler offers job check pointing and suspension with optional job cancellation, hold and re-queue. These capabilities provide great flexibility in defining real-time job and resource priority control.

• TWS LoadLeveler integrates with AIX Workload Manager (WLM) to provide both resource specifications on job start and resource utilization controls to prevent resource overuse by errant applications.

• A new TWS LoadLeveler algorithm is available for the Blue Gene® machine BG/L that extends TWS LoadLeveler's reliable performance to unprecedented scalability levels (on the order of tens of thousands of processors) within the Blue Gene family of machines.

• TWS LoadLeveler integrates easily with the IBM High Performance Switch (HPS) for pSeries hardware, enabling immediate use of the scalable bandwidth and additional multitasking capabilities

• IBM Tivoli Workload Scheduler for distributed and integrated end-to-end enterprise workload scheduling

• IBM Tivoli Dynamic Workload Broker for dynamic matching of workloads to best available resources within mainstream enterprise and Grid scheduling networks

• IBM Tivoli Workload Scheduler for Applications for extensive IBM Tivoli Workload Scheduler integration with SAP, Oracle and PeopleSoft business applications

• IBM Tivoli Workload Scheduler for z/OS for mainframe and integrated end-to-end enterprise workload scheduling

• IBM Tivoli Workload Scheduler for Virtualized Data Centers for providing integration between IBM Tivoli Workload Scheduler and Open Grid Services Architecture

• Buyer's Guide
• Solution sheet (216KB)
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