LSF Version 7.3 - Administering Platform LSF

Administering Platform LSF 279

C HAPTER

Specifying Resource Requirements

Contents

◆ About Resource Requirements on page 279

◆ Queue-level Resource Requirements on page 280

◆ Job-level Resource Requirements on page 281

◆ About Resource Requirement Strings on page 283

◆ Selection String on page 284

◆ Order String on page 287

◆ Usage String on page 288

◆ Span String on page 292

◆ Same String on page 293

About Resource Requirements

Resource requirements define which hosts a job can run on. Each job has its

resource requirements. Hosts that match the resource requirements are the

candidate hosts. When LSF schedules a job, it uses the load index values of all the

candidate hosts. The load values for each host are compared to the scheduling

conditions. Jobs are only dispatched to a host if all load values are within the

scheduling thresholds.

By default, if a job has no resource requirements, LSF places it on a host of the same

type as the submission host (i.e.,

type==local). However, if a job has string or

Boolean resource requirements specified and the host type has not been specified,

LSF places the job on any host (i.e.,

type==any) that satisfies the resource

requirements.

To override the LSF defaults, specify resource requirements explicitly. Resource

requirements can be set for queues, for application profiles, or for individual jobs.