ORB_init() call. The internal structure for
command-line options is the traditional
argc/argv vector of strings style
popularized by C/C++ and Unix. By convention,
ORB_init() will consume any options that it recognizes,
removing them from argv, whereas unrecognized options
will not be removed.
svc.conf file. These ORB plug-ins
can be fine-tuned by specifying their options in the
svc.conf file.
TAO provides several default plug-ins to deploy resource management
strategies, client/server strategies, and communication protocols
that can be further customized via the
svc.conf file options described in this page. Advanced
users can also develop their own plug-ins to customize TAO.
A svc.conf file, however, is not required to run TAO
programs since TAO provides a set of built-in strategies configured for
use with common use cases. Many of the default configuratiions for
these built-in strategies can also be customized when TAO is
compiled.
Environment Variable Description NameServiceIORwhichSpecifies which IOR the Naming Service is listening on. NameServicePortwhichSpecifies which port the Naming Service is listening on for multicast requests. TradingServiceIORwhichSpecifies which IOR the Trading Service is listening on. TradingServicePortwhichSpecifies which port the Trading Service is listening on for multicast requests. ImplRepoServiceIORwhichSpecifies the IOR of an Implementation Repository. ImplRepoServicePortwhichSpecifies which port the Implementation Repository is listening on for multicast requests.
The following components can be tuned via the different options mentioned above:
The details of the options are mentioned below.
CORBA::ORBTypically, the following options are set via command line parameters that are eventually passed to CORBA::ORB_init ().
Note:
-ORBGlobalCollocationflag has been merged with-ORBCollocation.
Option Description -ORBSvcConfconfig filenameSpecifies the name of the file from which it will read dynamic service configuration directives ala ACE's Service Configurator. By default, a service configurator-based application will look for a file named "svc.conf" in the current directory. -ORBSvcConfDirectivedirectivestringSpecifies a service configuration directive, which is passed to ACE's Service Configurator. You can pass multiple of these options on the same command-line. -ORBServiceConfigLoggerKeylogger keySet the logger key in the ACE_Service_Configframework. Equivalent to the-koption on the ACE service configurator class.-ORBDaemonSpecifies that the ORB should daemonize itself. -ORBDebugTurns on the output of debugging messages within ACE's Service Configurator componentry. -ORBDebugLevellevelControl the level of debugging in the ORB. Higher number produce more output (try 10). -ORBEndpointendpointTells the ORB to listen for requests on the interface specified by endpoint. Endpoints are specified using a URL style format. An endpoint has the form: whereprotocol://V.v@addr1,...,W.w@addrNV.vandW.ware optional protcol versions for each address. An example of an IIOP endpoint is:Sets of endpoints may be specified using multipleiiop://hostname:port-ORBEndpointoptions or by delimiting endpoints with a semi-colon (;). For example,is equivalent to:-ORBEndpoint iiop://localhost:9999 -ORBEndpoint uiop:///tmp/mylocalsock -ORBEndpoint shmiop://10002Notice the single quotes (') in the latter option specification. Single quotes are needed to prevent the shell from interpreting text after the semi-colon as another command to run.-ORBEndpoint 'iiop://localhost:9999;uiop:///tmp/mylocalsock;shmiop://10002'If an endpoint is specified without an
addrsuch as the following:then a default endpoint will be created for the specified protocol.-ORBEndpoint uiop:// -ORBEndpoint shmiop://This is a server side option.
-ORBObjRefStylewhichSpecifies the user-visible style of object references. The range of values is IOR(default), which is the traditional nonsensical object reference, orURL, which looks more like a URL.-ORBRcvSockreceive buffer sizeSpecify the size of the socket receive buffer as a positive, non-zero integer. If not specified, the ACE_DEFAULT_MAX_SOCKET_BUFSIZ default is used. -ORBSndSocksend buffer sizeSpecify the size of the socket send buffer as a positive, non-zero integer. If not specified, the ACE_DEFAULT_MAX_SOCKET_BUFSIZ default is used. -ORBNodelayboolean (0|1)Enable or disable the TCP_NODELAY option. By default, TCP_NODELAY is enabled. -ORBNameServicePortportspecSpecifies which port the Naming Service is listening on for multicast requests. By default, TAO_DEFAULT_NAME_SERVICE_REQUEST_PORT, which is 10013 is used. -ORBTradingServicePortportspecSpecifies to which port the Trading Service is listening on for multicast requests. By default, TAO_DEFAULT_TRADING_SERVICE_REQUEST_PORT which is 10016 is used. -ORBImplRepoServicePortportspecSpecifies to which port the Implementation Repository is listening on for multicast requests. By default, TAO_DEFAULT_IMPLREPO_SERVER_REQUEST_PORT which is 10018 is to be used. -ORBMulticastDiscoveryEndpointend_pointSpecifies the endpoint that should be used for locating the Naming Service through multicast. end_point is of the form ip-number:port-number (e.g., "tango.cs.wustl.edu:1234" or "128.252.166.57:1234"). If there is no ':' in the end_point it is assumed to be a port number, with the IP address being INADDR_ANY. -ORBCollocationglobal/per-orb/noSpecifies the use of collocation object optimization. If global is specified, objects in the same process will be treated as collocated. If per-orb is specified, only objects in the same ORB are treated as collocated. When no is specified, no objects are treated as collocated. Default is global. -ORBCollocationStrategythru_poa/directSpecifies what kind of collocated object to use. If the thru_poa strategy is used, TAO uses the collocation object implementation that respects POA's current state and policies. When using the direct strategy, method invocations on collocated objects become direct calls to servant without checking POA's status (which translates to better performance.) Notice that the interfaces that you wish to use direct collocation with must be compiled with -Gd. Default is thru_poa.-ORBPreconnectendpointPre-establishes a blocking connection to each listed endpoint. If a connection cannot be established the failed preconnection will be ignored and the next preconnection in the list will be processed. Successful and unsuccessful preconnections will be displayed if a debugging level greater than or equal to one is specified by using the -ORBDebugLeveloption. Listing the same combination multiple times will properly establish multiple connections to that endpoint. The-ORBPreconnectoption uses the same endpoint format as the-ORBEndpointoption.This is a client-side option.
-ORBPreconnect is deprecated. This option will be removed in the near future. The Real-Time CORBA standard
validate_connection()method should be used instead.-ORBCDRTradeoffmaxsizeControl the strategy to tradeoff between copy vs. no copy marshalling of octet sequences. If an octet sequence is smaller than maxsize and the current message block contains enough space for it the octet sequence is copied instead of appended to the CDR stream. By default, ACE_DEFAULT_CDR_MEMORY_TRADEOFF is used. -ORBSkipServiceConfigOpenDo not call the ACE_Service_Config::openmethod when initializing the ORB. This option is generally only useful when dynamically loading the ORB.This option is deprecated. It is no longer needed since the Service Configurator is now reentrant and thread-safe.
-ORBDottedDecimalAddressesboolean (0|1)Use the dotted decimal notation for addresses. This option helps to work around broken DNS implementations and may also reduce the time spent resolving IP addresses. By default domain names are used in IORs. -ORBInitRefObjectId=IORAllows specification of an arbitrary object reference for an initial service. The IOR could be in any one of the following formats : OMG IOR, URL, corbaloc (including uioploc) or file. corbaloc is a multiple end-point IOR understood by the string_to_object () method and used as a boot-strapping mechanism by the resolve_initial_references () method. The mappings specified through this argument override the orb-install-time defaults. The file://pathname interprets the contents of the pathname file as an object reference in any of the above formats. -ORBDefaultInitRefIOR prefixThis argument allows resolution of initial references not explicitly specified with -ORBInitRef. It requires a URL prefix that, after appending a slash '/' ('|' for UIOP pluggable protocol) and a simple object key, forms a new URL to identify an initial object reference. The URL prefix format currently supported is corbaloc. -ORBStdProfileComponentsboolean (0|1)If 0 then the ORB does not generate the OMG standardized profile components, such as the ORB type and code sets. Notice that the presence of this components is optional in GIOP 1.1 The default value is controlled by a compile-time flag (check orbconf.h). -ORBResourceswhichThis option is deprecated, since this option has almost negligible effect on the ORB. The right type of resources are selected by the ORB during runtime. For example the memory for the output datapath always defaults to TSS. The inour data path always defaults to stack for small messages and global pool for larger messages. There was no effect with the use of this option. -ORBUseIMRboolean (0|1)This argument specifies that for POAs with the PERSISTENT policy, that the Implementation Repository should be used for notification of startup and shutdown and Object References should be changed to use the Implementation Repository also. -ORBLogFilelog file nameCauses all ACE_DEBUG and ACE_ERROR output to be redirected to the specified file. -ORBSingleReadOptimizationboolean (0|1)This option controls single read optimzations when reading requests. If this option is off, the ORB will do two reads to read a request. One to read the request header and the other to read the request payload. If this option is on, the ORB will do a read of size TAO_MAXBUFSIZE, hoping to read the entire request. However, in this case, there is a chance of reading more than one request. If any additional requests have been read, they are queued up for processing later. This option defaults to 1 because it can provide better performance since one less read is performed. However, in the case of RT-CORBA, this option should be set to 0. Consider the following scenario: two requests are read from one socket; the additional request is queued; a Reactor notify is dispatch to awake a follower threads; at this time, new requests arrive on others sockets of higher priority; however, since notifies are given preferences over normal I/O, the lower priority queued message will be processed before the newly arrived higher priority request.
-ORBListenEndpointsendpointThis Option is similar to ORBEndPoint option described above. The ORBEndpoint option would be deprecated in later versions on TAO. This option is introduced with Object Reference Template Specification. -ORBIdORB_NAMEThis option allows setting the name of an ORB as the Option name suggests. -ORBServerIdserver_idThis option allows setting a name/id to a server to uniquely identify a server to the Implementation Repository.
TAO_Default_Resource_FactoryTypically, the following options are set via the service configurator (svc.conf) file. The following line in the svc.conf file (all in one line)would load all the options listed within "".
static Resource_Factory "[list of options]"
Option Description -ORBResourceswhichThis option is deprecated, since this option has almost negligible effect on the ORB. The right type of resources are selected by the ORB during runtime. For example the memory for the output datapath always defaults to TSS. The inour data path always defaults to stack for small messages and global pool for larger messages. There was no effect with the use of this option. -ORBReactorMaskSignals0/1ACE select reactors mask signals during upcalls to the event handlers. This is only useful if the application is going to trap those signals and handle them in any way. Disabling the mask can improve performance by reducing the number of kernel level locks. -ORBProtocolFactoryfactorySpecify which pluggable protocol factory to load. By default, only the factory for the IIOP protocol ( IIOP_Factoryis loaded.For example, if some protocol called
Foowhose factory was calledFoo_Factorywas available, then it could be loaded into TAO by specifying-ORBProtocolFactory Foo_Factoryin the service configurator file. TheFoopluggable protocol would then be available for use.-ORBIORParserparserName an IOR Parser to load. IOR Parsers are used to interpret strings passed to ORB::string_to_object(). By default the ORB can handle multiple string formats, includingIOR:,corbaloc:,corbaname:, andfile:. The application developer can add new IOR formats using this option.-ORBConnectionCachingStrategytypeThis option is deprecated. Use -ORBConnectionPurgingStrategy instead. -ORBConnectionPurgingStrategytypeOpened connections are added to the transport cache so they can be reused. However, if a process continues to run and these connections are not reused, the cache will continue to grow. Therefore, before each new connection, the cache is checked and purged if it has reached the limit specified by the -ORBConnectionCacheMax option or the system default if that option was not used. The possible values for type are lru, lfu, fifo and null. The default is LRU (Least Recently Used). The others LFU (Least Frequently Used), FIFO (First In First Out), and null (No connections are purged) are contained within the TAO Strategies library. -ORBConnectionCacheMaxlimitThe transport cache will grow to a maximum of the specified limit. The default is system dependent, but can be overridden at compile time by defining the preprocessor macro TAO_CONNECTION_CACHE_MAXIMUM. -ORBMuxedConnectionMaxnumberThe transport cache allows only specified number of connections-per-QoS property to be added to connection cache. Threads not getting the connections will wait for the connections to be released. This options is more useful for transports using a muxed connection strategy and want control on the number of connections that are created by the active threads. -ORBConnectionCachePurgePercentagepercentIf the transport cache is purged, the specified percentage (20 by default) of the total number of connections cached will be closed. -ORBPurgePercentagepercentThis option is deprecated and will automatically forward to -ORBConnectionCachePurgePercentage. -ORBConnectionCacheLocklocktypeSpecify the type of lock to be used by the Connection Cache. Possible values for lock type are thread, which specifies that an inter-thread mutex is used to guarantee exclusive access, andnull, which specifies that no locking be performed. The default is thread.-ORBFlushingStrategytypeBy default TAO provides three strategies to flush queued messages. The leader_followerstrategy uses the Reactor and non-blocking I/O to send the outgoing messages, this strategy participates in the Leader/Followers protocol to synchronize access to the Reactor. Thereactivestrategy uses the Reactor but does not take part in the Leader/Followers protocol, thus it is better used only in single threaded applications. Finally, theblockingstrategy flushes the queue as soon as it becomes "full", and blocks the thread until all the data is sent.
TAO_Default_Server_Strategy_FactoryTypically, the following options are set via the service configurator (svc.conf) file. The following line in the svc.conf file (all in one line)would load all the options listed within ""
static Server_Strategy_Factory "[list of options]"Note:
-ORBDemuxStrategyflag has been changed to-ORBSystemidPolicyDemuxStrategyand-ORBUseridPolicyDemuxStrategy.Note:
-ORBTableSizeflag has been changed to-ORBActiveObjectMapSize.
Option Description -ORBConcurrencywhichSpecify which concurrency strategy to use. Range of values is reactivefor a purely Reactor-driven concurrency strategy orthread-per-connectionfor creating a new thread to service each connection. The default is reactive.-ORBThreadPerConnectionTimeoutmillisecondsIn many platforms it is impossible to interrupt the server threads created by the thread-per-connectionmodel. This is because these threads are blocked inread()operations (and not inselect()). As a workaround, the server threads periodically poll the ORB to find out if they should shutdown. This option controls the period of the polling, expressed in milliseconds. Applications that do not shutdown, or that can otherwise ensure that no server threads will be running at shutdown (for example if all the clients terminate before the server) can disable the polling using the magic valueINFINITE.If the option is not provided then the ORB uses the compile time flag
TAO_DEFAULT_THREAD_PER_CONNECTION_TIMEOUT, this flag also expresses the time in milliseconds (as a string constant) and the magic value"INFINITE"can be used to disable polling entirely. This yields a slight performance improvement (around 1%).-ORBActiveObjectMapSizeactive object map sizeSpecify the size of the active object map. If not specified, the default value is 64. -ORBUseridPolicyDemuxStrategyuser id policy based demultiplexing strategySpecify the demultiplexing lookup strategy to be used with the user id policy. The demultiplexing strategy can be one of dynamicorlinear. This option defaults to use thedynamicstrategy.-ORBSystemidPolicyDemuxStrategysystem id policy based demultiplexing strategySpecify the demultiplexing lookup strategy to be used with the system id policy. The demultiplexing strategy can be one of dynamic,linear, oractive. This option defaults to use thedynamicstrategy when-ORBAllowReactivationOfSystemidsis true, and toactivestrategy when-ORBAllowReactivationOfSystemidsis false.-ORBUniqueidPolicyReverseDemuxStrategyunique id policy based reverse demultiplexing strategySpecify the reverse demultiplexing lookup strategy to be used with the unique id policy. The reverse demultiplexing strategy can be one of dynamicorlinear. This option defaults to use thedynamicstrategy.-ORBAllowReactivationOfSystemidsallows reactivation of system idsSpecify whether system ids can be reactivated, i.e., once an id that was generated by the system has be deactivated, will the user reactivate a new servant using the old id. If the user is not going to use this feature, the IORs can be shortened, an extra comparison in the critical upcall path removed, and some memory on the server side can be saved. The ORBAllowReactivationOfSystemidscan be0or1. This option defaults to1.-ORBActiveHintInIdsadds an active hint in idsSpecify whether an active hint should be added to ids. With active hints, ids can be found quickly. However, they lead to larger IORs. Note that this option is disregarded -ORBAllowReactivationOfSystemidsis set to0. The -ORBActiveHintInIds can be0or1. This option defaults to1.-ORBPoaMapSizepoa map sizeSpecify the size of the poa map. If not specified, the default value is 24. -ORBPersistentidPolicyDemuxStrategypersistent id policy based demultiplexing strategySpecify the demultiplexing lookup strategy to be used with the persistent id policy. The demultiplexing strategy can be one of dynamicorlinear. This option defaults to use thedynamicstrategy.-ORBTransientidPolicyDemuxStrategytransient id policy based demultiplexing strategySpecify the demultiplexing lookup strategy to be used with the transient id policy. The demultiplexing strategy can be one of dynamic,linear, oractive. This option defaults to use theactivestrategy.-ORBActiveHintInPOANamesadds an active hint in poa namesSpecify whether an active hint should be added to poa names. With active hints, poa names can be found quickly. However, they lead to larger IORs. The -ORBActiveHintInPOANames can be 0or1. This option defaults to1.-ORBThreadFlagsthread flagsSpecify the flags used for thread creation. Flags can be any logical-OR combination of THR_DETACHED,THR_BOUND,THR_NEW_LWP,THE_SUSPENDED. The default isTHR_BOUND | THR_DETACHED.-ORBPOALocklock typeSpecify the type of lock to be used for POA accesses. Possible values for lock type are thread, which specifies that an inter-thread mutex is used to guarantee exclusive access, andnull, which specifies that no locking be performed. The default isthread.
TAO_Default_Client_Strategy_FactoryTypically, the following options are set via the service configurator (svc.conf) file. The following line in the svc.conf file (all in one line)would load all the options listed within "".
static Client_Strategy_Factory "[list of options]"
Option Description -ORBProfileLockwhichSpecify the kind of synchronization primitive for the Profiles. Default is thread, which means that a regular thread mutex is used. The second option isnull, which means a null lock is used. This makes sense in case of optimizations and is allowed when no forwarding is used or only a single threaded client.-ORBClientConnectionHandlerMT / ST / RWST means use the single-threaded client connection handler, i.e., the leader follower model will not be used. However, ST does support nested upcalls and handling of new requests while waiting for the reply from a server. MT means use the multi-threaded client connection handler which uses the leader follower model. This model allows the use of multiple threads with a single Reactor.
RW selects a strategy that simply blocks in recv() when waiting for a response from the server instead of waiting in the Reactor. The RW strategy only works when the application does not have to worry about new request showing up when waiting for a response. Further, this strategy cannot be used with AMI calls. Therefore, this strategy is appropriate only for "pure" synchronous clients. Note that applications with nested upcalls are not "pure" synchronous clients. Also note that this strategy will only effect two way calls, since there is no waiting for one way calls. This strategy can also be used in an application that is both a client and a server if the server side is handled by a separate thread and the client threads are "pure" clients.
Default for this option is MT.
-ORBTransportMuxStrategyEXCLUSIVE / MUXEDEXCLUSIVE means that the Transport does not multiplex requests on a connection. At a time, there can be only one request pending on a connection. MUXED means that Transport multiplexes more than one request at the same time on a connection. This option is often used in conjunction with Asynchronous Method Invocation, because multiple requests can be sent 'in bulk'.
Default for this option is MUXED.
-ORBConnectStrategytypeTAO provides three strategies to connect to remote servers. The default leader_followerstrategy uses the Reactor and non-blocking connects to connect and this strategy participates in the Leader/Followers protocol to synchronize access to the Reactor. Thereactivestrategy uses the Reactor for non-blocking connects but does not take part in the Leader/Followers protocol, thus it is better used only in single threaded applications. Finally, theblockedstrategy as the name implies, blocks the thread until connection is complete. Some of the protocols in TAO viz. SHMIOP and SSLIOP can only use blocked strategy.
TAO_Advanced_Resource_FactoryThis factory is located in the TAO_Strategies library.
It accepts the options below as well as those described above in the
TAO_Default_Resource_Factory.
This factory can be loaded dynamically using a service configurator
directive of the form (all on one line):
dynamic Advanced_Resource_Factory Service_Object * TAO_Strategies:_make_TAO_Advanced_Resource_Factory () "-ORBReactorType select_st"
It can also be loaded statically by doing the following:
#include "tao/Strategies/advanced_resource.h" to the file containing main()
static Advanced_Resource_Factory "-ORBReactorType select_st"
You can omit the #include if you always use dynamic libraries.
Once you have loaded the Advanced_Resource_Factory, then directives for the Resource_Factory have no effect (and generate warnings telling you so).
Note: -ORBReactorLock flag has been
superseded by -ORBReactorType.
RT_ORB_LoaderTypically, the following options are set via the service configurator (svc.conf) file. The following line in the svc.conf file (all in one line)would load all the options listed within "".
static RT_ORB_Loader "[list of options]"
Option Description -ORBSchedPolicypolicySpecify the scheduling policy used for the priority mapping computations and to specify the scheduling policy used when creating RTCORBA threads. Priority mappings map the CORBA priority range (from 0 to 32767) into the native OS priority range, but in some operating systems the range depends on the scheduling policy used. Valid values are SCHED_OTHER, SCHED_FIFO and SCHED_RR. Defaults to SCHED_OTHER. Note that in some operating systems some of the scheduling policies require super user privileges. -ORBScopePolicyscopeSpecify the scheduling scope used when creating RTCORBA threads. Valid values are: PROCESS and SYSTEM. Defaults to PROCESS. -ORBPriorityMappingmapping_typeSelect the priority mapping to use. There are three priority mappings provided by TAO: the linear mapping maps between the CORBA range of priorities and the native range of priorities; the direct mapping maps CORBA priorities directly to native priorities; and the continuous maps the first n CORBA priorities to the range of native priorities, where n is the number of native priorities. Defaults to direct. Note that continuous was previously referred to as direct.
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