Administering Platform LSF - SAS

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$Intel(R) Math Kernel Library for Linux* OS User's Guide$

Reserving Processors Reserving Processors About processor reservation When parallel jobs have to compete with sequential jobs for resources, job slots that become available are likely to be taken immediately by a sequential job. Parallel jobs need multiple job slots to be available before they can be dispatched. If the cluster is always busy, a large parallel job could be pending indefinitely. The more processors a parallel job requires, the worse the problem is. Processor reservation solves this problem by reserving job slots as they become available, until there are enough reserved job slots to run the parallel job. You might want to configure processor reservation if your cluster has a lot of sequential jobs that compete for resources with parallel jobs. How processor reservation works Processor reservation is disabled by default. If processor reservation is enabled, and a parallel job cannot be dispatched because there are not enough job slots to satisfy its minimum processor requirements, the job slots that are currently available will be reserved and accumulated. A reserved job slot is unavailable to any other job. To avoid deadlock situations in which the system reserves job slots for multiple parallel jobs and none of them can acquire sufficient resources to start, a parallel job will give up all its reserved job slots if it has not accumulated enough to start within a specified time. The reservation time starts from the time the first slot is reserved. When the reservation time expires, the job cannot reserve any slots for one scheduling cycle, but then the reservation process can begin again. Configuring processor reservation Syntax To enable processor reservation, set SLOT_RESERVE in lsb.queues and specify the reservation time (a job cannot hold any reserved slots after its reservation time expires). SLOT_RESERVE=MAX_RESERVE_TIME[n]. where n is an integer by which to multiply MBD_SLEEP_TIME. MBD_SLEEP_TIME is defined in lsb.params; the default value is 60 seconds. Example Begin Queue . PJOB_LIMIT=1 SLOT_RESERVE = MAX_RESERVE_TIME[5] . End Queue In this example, if MBD_SLEEP_TIME is 60 seconds, a job can reserve job slots for 5 minutes. If MBD_SLEEP_TIME is 30 seconds, a job can reserve job slots for 5 *30= 150 seconds, or 2.5 minutes. 450 Administering Platform LSF
Chapter 34 Running Parallel Jobs Viewing information about reserved job slots Reserved slots can be displayed with the bjobs command. The number of reserved slots can be displayed with the bqueues, bhosts, bhpart, and busers commands. Look in the RSV column. Administering Platform LSF 451
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Administering Platform LSF® Versio
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Contents Welcome . . . . . . . . .
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Contents Part II: Working with Reso
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Contents 17 Reserving Resources . .
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Contents 30 External Job Submission
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Contents 40 Non-Shared File Systems
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Welcome Contents ◆ “About This
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Welcome Command notation Notation M
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Welcome Platform LSF License Schedu
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Welcome Resource requirement specif
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Welcome Run-time enhancements Threa
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Welcome Environment variables ◆
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Welcome New files added to installa
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Technical Support Contact Platform
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C H A P T E R 1 About Platform LSF
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Chapter 1 About Platform LSF Job sl
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Chapter 1 About Platform LSF Master
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Chapter 1 About Platform LSF Master
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Chapter 1 About Platform LSF Host t
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Chapter 1 About Platform LSF Extern
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Chapter 1 About Platform LSF Job Li
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C H A P T E R 2 How the System Work
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Chapter 2 How the System Works Queu
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Chapter 2 How the System Works Disp
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Job Execution Environment Shared us
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Fault Tolerance Dynamic master host
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P A R T I Managing Your Cluster Con
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Viewing Cluster Information Viewing
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Default Directory Structures Defaul
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Default Directory Structures Window
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Controlling Daemons Controlling Dae
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Controlling mbatchd Controlling mba
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Reconfiguring Your Cluster 3 Run ba
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Host States Host States Host states
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Viewing Host Information Viewing Ho
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Viewing Host Information type Viewi
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Controlling Hosts Controlling Hosts
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Adding a Host Adding a Host Use lsf
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Removing a Host Removing a Host CAU
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Adding and Removing Hosts Dynamical
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Adding and Removing Hosts Dynamical
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Adding Host Types and Host Models t
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Registering Service Ports NIS or NI
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Host Naming Host Naming Network add
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Hosts with Multiple Addresses Examp
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Host Groups Host Groups Where to us
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Tuning CPU Factors Tuning CPU Facto
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Handling Host-level Job Exceptions
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Handling Host-level Job Exceptions
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Queue States Queue States Queue sta
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Viewing Queue Information SCHEDULIN
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Controlling Queues Controlling Queu
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Controlling Queues Dispatch Windows
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Managing Queues Managing Queues Res
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Handling Job Exceptions Configuring
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Job States Job States The bjobs com
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Job States Viewing wait status and
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Viewing Job Information Viewing exc
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Switching Jobs from One Queue to An
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Suspending and Resuming Jobs Suspen
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Sending a Signal to a Job Sending a
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Using Job Groups Creating a job gro
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Using Job Groups % bhist -l 105 You
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Viewing User and User Group Informa
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About User Groups About User Groups
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LSF User Groups LSF User Groups You
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LSF User Groups 134 Administering P
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C H A P T E R 8 Understanding Resou
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Chapter 8 Understanding Resources T
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Chapter 8 Understanding Resources S
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How LSF Uses Resources Viewing job
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Chapter 8 Understanding Resources S
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Chapter 8 Understanding Resources V
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Chapter 8 Understanding Resources A
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C H A P T E R 9 Adding Resources Co
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Adding New Resources to Your Cluste
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Chapter 9 Adding Resources Configur
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Static Shared Resource Reservation
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Chapter 9 Adding Resources Configur
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Chapter 9 Adding Resources ELIM res
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Modifying a Built-In Load Index Con
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P A R T III Scheduling Policies Con
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Specifying Time Values Specifying T
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Specifying Time Expressions Specify
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Automatic Time-based Configuration
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Deadline Constraint Scheduling Dead
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Exclusive Scheduling 176 Administer
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About Preemptive Scheduling About P
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How Preemptive Scheduling Works Job
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Configuring Preemptive Scheduling Q
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Configuring Preemptive Scheduling 1
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About Resource Requirements About R
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Queue-Level Resource Requirements V
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About Resource Requirement Strings
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Selection String Selection String S
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Order String Order String Syntax De
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Usage String Example rusage[mem=50:
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Span String Span String Syntax A sp
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Same String 200 Administering Platf
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About Fairshare Scheduling About Fa
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User Share Assignments Examples ◆
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Dynamic User Priority Default dynam
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Host Partition Fairshare Host Parti
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Queue-Level User-based Fairshare Qu
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Cross-queue Fairshare bqueues -l al
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Cross-queue Fairshare 3 In all the
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Hierarchical Fairshare Viewing hier
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Queue-based Fairshare Queue-based F
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Configuring Slot Allocation per Que
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Viewing Queue-based Fairshare Alloc
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Typical Slot Allocation Scenarios T
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Typical Slot Allocation Scenarios W
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Typical Slot Allocation Scenarios T
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Using Historical and Committed Run
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Using Historical and Committed Run
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Users Affected by Multiple Fairshar
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Ways to Configure Fairshare Ways to
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Ways to Configure Fairshare Example
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Using Goal-Oriented SLA Scheduling
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Using Goal-Oriented SLA Scheduling
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Configuring Service Classes for SLA
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Viewing Information about SLAs and
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Viewing Information about SLAs and
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Understanding Service Class Behavio
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C H A P T E R 16 Resource Allocatio
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Chapter 16 Resource Allocation Limi
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C H A P T E R 17 Reserving Resource
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Chapter 17 Reserving Resources Usin
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Chapter 17 Reserving Resources Usin
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Chapter 17 Reserving Resources View
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C H A P T E R 18 Managing Software
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Host Locked Licenses Chapter 18 Man
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Network Floating Licenses Chapter 1
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Chapter 18 Managing Software Licens
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C H A P T E R 19 Dispatch and Run W
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Run Windows Configuring run windows
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C H A P T E R 20 Job Dependencies C
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Chapter 20 Job Dependencies ◆ In
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Chapter 20 Job Dependencies externa
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C H A P T E R 21 Job Priorities Con
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Chapter 21 Job Priorities Specifyin
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C H A P T E R 22 Job Requeue and Jo
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Chapter 22 Job Requeue and Job Reru
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C H A P T E R 23 Job Checkpoint, Re
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Approaches to Checkpointing Kernel-
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Chapter 23 Job Checkpoint, Restart,
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Checkpointing a Job Prerequisites C
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Making Jobs Checkpointable Manually
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Enabling Periodic Checkpointing At
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Restarting Checkpointed Jobs Requir
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Chapter 23 Job Checkpoint, Restart,
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C H A P T E R 24 Chunk Job Dispatch
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Chapter 24 Chunk Job Dispatch Confi
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Submitting and Controlling Chunk Jo
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Chapter 24 Chunk Job Dispatch Fairs
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C H A P T E R Ë 25 Job Arrays LSF
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Chapter 25 Job Arrays Maximum size
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Redirecting Standard Input and Outp
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Chapter 25 Job Arrays Job Array Dep
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Chapter 25 Job Arrays Specific job
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Requeuing a Job Array Chapter 25 Jo
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P A R T V Controlling Job Execution
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About Resource Usage Limits About R
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Specifying Resource Usage Limits Sp
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Specifying Resource Usage Limits If
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Supported Resource Usage Limits and
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CPU Time and Run Time Normalization
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Automatic Job Suspension Automatic
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Suspending Conditions Suspending Co
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Suspending Conditions Viewing suspe
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About Pre-Execution and Post-Execut
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Configuring Pre- and Post-Execution
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Configuring Pre- and Post-Execution
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About Job Starters About Job Starte
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Command-Level Job Starters Command-
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Queue-Level Job Starters Queue-Leve
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Controlling Execution Environment U
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Understanding External Executables
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Using esub Option LSB_SUB_EXCEPTION
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Using esub General esub logic Rejec
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Using esub # Deny userC the ability
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Working with eexec Working with eex
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Default Job Control Actions Default
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Configuring Job Control Actions Con
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Configuring Job Control Actions Exa
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Customizing Cross-Platform Signal C
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Page 419 and 420: Interactive Tasks Chapter 33 Runnin
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Page 434 and 435: Submitting MPI Jobs Submitting MPI
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Page 462 and 463: About Advance Reservation About Adv
Page 464 and 465: Configuring Advance Reservation ◆
Page 466 and 467: Using Advance Reservation Adding a
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Page 472 and 473: Using Advance Reservation Modifying
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Page 477 and 478: C H A P T E R 36 Event Generation C
Page 479 and 480: Chapter 36 Event Generation Events
Page 481 and 482: C H A P T E R 37 Tuning the Cluster
Page 483 and 484: Adjusting LIM Parameters RUNWINDOW
Page 485 and 486: Chapter 37 Tuning the Cluster Compa
Page 487 and 488: Changing Default LIM Behavior to Im
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Page 491 and 492: Tuning mbatchd on UNIX Operating sy
Page 493 and 494: C H A P T E R 38 Authentication Con
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Chapter 38 Authentication About Dae
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User Account Mapping Chapter 38 Aut
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C H A P T E R 39 Job Email, and Job
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Chapter 39 Job Email, and Job File
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C H A P T E R 40 Non-Shared File Sy
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Chapter 40 Non-Shared File Systems
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Chapter 40 Non-Shared File Systems
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C H A P T E R 41 Error and Event Lo
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Chapter 41 Error and Event Logging
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System Event Log CAUTION Chapter 41
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Chapter 41 Error and Event Logging
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C H A P T E R 42 Troubleshooting an
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Common LSF Problems LIM dies quietl
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Chapter 42 Troubleshooting and Erro
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Setting Daemon Timing Levels Chapte
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P A R T IX LSF Utilities Contents
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About lstcsh About lstcsh The lstcs
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Local and Remote Modes Local and Re
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Differences from Other Shells Diffe
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Starting lstcsh Starting lstcsh Sta
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Host Redirection Host Redirection E
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Built-in Commands Built-in Commands
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Writing Shell Scripts in lstcsh Wri
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Index job migration 321 job requeue
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Index D daemons authd 496 authentic
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Index file spooling. See command fi
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Index Internet addresses, matching
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Index host locked 279 interactive j
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Index pre-42 UNIX directory structu
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Index disabling 317 job-level 317 q
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Index associating with hosts 155 Bo
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Index status closed in bhosts 70 jo
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Index 580 Administering Platform LS
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