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authorWilliam R. Otte <wotte@dre.vanderbilt.edu>2006-07-24 15:50:11 +0000
committerWilliam R. Otte <wotte@dre.vanderbilt.edu>2006-07-24 15:50:11 +0000
commit6b846cf03c0bcbd8c276cb0af61a181e5f98eaae (patch)
treeda50d054f9c761c3f6a5923f6979e93306c56d68 /TAO/examples/RTScheduling/Fixed_Priority_Scheduler/README
parent0e555b9150d38e3b3473ba325b56db2642e6352b (diff)
downloadATCD-6b846cf03c0bcbd8c276cb0af61a181e5f98eaae.tar.gz
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-Fixed Priority Scheduler
-========================
-
-Table of contents
------------------
-1. Introduction
-2. Conf file parameters
-3. Running the example.
-
-1. Introduction
----------------
-
-This scheduler uses the OS scheduler to schedule the Distributable
-Threads (DTs) in the system. The DTs are scheduled according to their
-importance. The scheduler maps the importance of the DT to native
-thread priorities so the OS scheduler can schedule the DTs.
-
-In this experiment we show how dynamic scheduling is done using the
-Dynamic Scheduling framework with the Fixed Priority Scheduler as the
-pluggable scheduler. At any given instance the DT of highest priority
-is running on a given host.
-
-The experiment consists of the following participants:
-Job: A CORBA servant object that performs CPU intensive work. The
-amount of work depends on a load factor that is conveyed to the object
-per invocation as an argument.
-
-DT_Task: The distributable thread is a scheduling segment spanning one
-or more hosts.
-
-test: The test consists of a collection of Jobs and DTs hosted in
-a single process. The test reads a configuration file that can be used
-to initialize DTs and Jobs.
-
-Starter: The starter initiates the start of DTs on each host that the
-test is running on. This is to ensure that the experiment starts at
-the same time on all hosts.
-
-2. Conf file parameters
------------------------
-
-POA OPTIONS
-==========
-To specify POA options the format is:
-
--POACount <count> -POA <name> -PriorityModel <CLIENT|SERVER> <priority> -Lanes <count> (-Lane <priority> ,<static_threads> <dynamic_threads>)* -Bands <count> (-Band <low> <high>)*
-
-e.g.
--POACount 2 -POA poa1 -PriorityModel CLIENT 10 -Bands 2 -Band 1 20 -Band 30 85 -Lanes 2 -Lane 10 1 0 -Lane 80 1 0
-
-specifes a POA with:
-
-POA Count - Specifies the number of POAs that need to be activated. The following characteristics of each POA needs to be specified.
-
-Name - poa1
-
-Priority model - client propogated, def. priority = 10
-
-Bands - 2 Bands with Band values as follows -
- Band 1 : low priority = 1, high priority = 20
- Band 2 : low priority = 30, high priority = 85
-
-Lanes - 2 Lanes with Lane values as follows -
- Lane 1 : priority = 10, 1 static thread, 0 dynamic threads
- Lane 2 : priority = 80, 1 static thread, 0 dynamic threads
-
-
-Distributable Thread Task Options
-=================================
-
-The format to specify a DT Task is:
-
--DT_Count <count> -DT_Task Importance <imp> -Start_Time <time> -Iter <local_work> -Load <remote_work> -JobName <name>
-
-where,
--DT_Count = Total number of DT_Tasks
--DT_Task = Specifies a Distributable Thread
--Importance = The priority of the DT
--Start_Time = Time at which the DT enters the system
--Iter = The number of secs of work to be done on the local host. For a
-distributed DT it defines the number of secs of local work to be done
-before and after a remote method call is made.
--Load = The number of secs of work to be done on the remote host when
-a two-way method call is made by a distributed DT
--JobName <name> = Name of the Job object that this DT will make a
-remote method call on to do some 'Load' number of secs of work on the
-remote host
-
-e.g.
--DT_Count 1 -DT_Task -Importance 5 -Start_Time 0 -Iter 3 -Load 5 -JobName job_1
-
-specifes a DT Task in which,
-Importance = 5
-Start Time = 0
-Iter = 3
-Load = 5
-JobName = job_1
-
-Job Options
-===========
-The format for specify a Job is:
--Job_Count <count> -Job <name> <poa_name>
-
-where, poa_name is the POA that this object is activated in.
-
-Job Count - Specifies the number of jobs that are activated.
-
-e.g.
--Job job_10 poa1
-
-specifies a Job with,
-
-Name - job_10
-POA Name - poa1
-
-Misc
-=====
-
--GuidSeed <guid>
-
-This specifies the guid number with which the guid counter will get
-initialized. This is to ensure that unique guids are used. This will
-be removed when the ACE UUID generator is integrated with TAO.
-
--OutFile <filename>
-
-This specifies the data file in which the schedule of the DT"s running
-on the host will be output.
-
--LogFile <filenmae>
-
-This speficies the log file
-
-3. Running the example
-----------------------
-
-a) The activated Jobs and Synch objects are registered with a Naming
-service, so we need an NS running
-
-e.g. ./Naming_Service -o naming_ior
-
-b) Start one or more instances of ./test depending on the test
-configuration that you have designed.
-
-e.g. ./test -ORBInitRef NameService=file://naming_ior -ORBSvcConf svc.conf.whatever -ORBDebugLevel 1
-
-c) Execute the Starter that initiates the creation of DTs on all the
-hosts that the experiment is running
-
-eg. ./Starter -ORBInitRef NameService=file://naming.ior
-
-c) Once all the instances exit, the test will generate schedule files
-as specified by the user with the -OutFile option file
-
-