Threads Usage

GigaSpaces uses Thread resources in an extensive manner to scale the different activities executed within the JVM Java Virtual Machine. A virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. process. The may happen at the client or server side. Some of the modules within the server or client side (proxy) require some tuning before moving into production. This section describes the important Thread (Thread pools) started and provides information when and how these should be tuned.

Threads List

• Indicates the thread name includes a running number.
• SPACE_NAME - Indicates the thread name includes the associated space name using this thread.

Thread Name	Description	Configuration Parameters	Client Server
LRMI Selector Accept	Responsible for accepting incoming socket connections.	Single Thread	Server
LRMI async Selector	Client side, handles async invocation, i.e executors, asyncRead/take.	4 Threads	Server
Pending Answers-pool	Responsible for sending a callback to template based waiting operations (read/take).	space-config.engine.min_threads space-config.engine.max_threads	Server
Notifier-pool	Responsible to dispatch notification to client side. Used with the Notify Container Java version | .NET version and Session Based Messaging API. See the Scaling Notification Delivery for details.	space-config.engine.notify_min_threads space-config.engine.notify_max_threads	Server
Processor-pool	Pool for space operations post processing that can be done asynchronously to user operation. Transaction cleanup, notifications etc.	space-config.engine.min_threads space-config.engine.max_threads	Server
Connection-pool	Pool for regualr space operations execution.	com.gs.transport_protocol.lrmi.max-threads com.gs.transport_protocol.lrmi.min-threads	Server
Custom pool	Pool for notify and task execution	com.gs.transport_protocol.lrmi.custom. threadpool.min-threads com.gs.transport_protocol.lrmi.custom. threadpool.max-threads	Server
System pool	Pool for admin operations	com.gs.transport_protocol.lrmi.system-priority.threadpool.min-threads com.gs.transport_protocol.lrmi.system-priority.threadpool.max-threads	Server
SG LeaseReaper	Used by the Service Grid A built-in orchestration tool which contains a set of Grid Service Containers (GSCs) managed by a Grid Service Manager. The containers host various deployments of Processing Units and data grids. Each container can be run on a separate physical machine. This orchestration is available for XAP only.	Single Thread	Server
Template Expiration Manager Timer	The main thread of expiration manager. Wakes up on each expiration period to find the expired templates.	Single Thread per space	Server
TemplateExpirationManager-pool#	Responsible for sending response to waiting client when their template expires.	16 threads max per space	Server
SyncReplicationChannel SPACE_NAME	Runs per sync replication channel	Dynamically adjusted	Server
CapabilityChannel			Server
ClassLoaderCache- SelfCleaningTable	Used to clean up resources of class loaders once terminated (undeploy of processing unit This is the unit of packaging and deployment in the GigaSpaces Data Grid, and is essentially the main GigaSpaces service. The Processing Unit (PU) itself is typically deployed onto the Service Grid. When a Processing Unit is deployed, a Processing Unit instance is the actual runtime entity.)	Single Thread	Server
TransactionTableHolder-SelfCleaningTable	Responsible for cleaning zombie local transactions that were abandoned by the user application without committing. Single thread per GSC Grid Service Container. This provides an isolated runtime for one (or more) processing unit (PU) instance and exposes its state to the GSM.	Single Thread per space	Server
SLA Monitor Disk	Used by the Service Grid. SLA free disk space monitor	Single Thread	Server
Memory:writer	Used by the Service Grid. SLA Memory monitor	Single Thread	Server
CPU:writer	Used by the Service Grid. SLA CPU monitor	Single Thread	Server
pollingEventContainer#	Used with the Polling Container	See the Concurrent Consumers	Client
LeaseRenewalManager Task	Respisible to review resource lease.	One per resource	Client
JoinManager Task	Responsible to communicate with the lookup service	Single thread per client proxy	Client
Liveness-detector	See the Proxy Connectivity for details.	Single thread per client proxy	Client
Liveness-monitor	See the Proxy Connectivity for details.	Single thread per client proxy	Client
LocalTransactionManagerImpl $Reaper SPACE_NAME	A thread that reaps expired transactions entries and other objects	Single thread per space	Server
GSPingManager	Used by the Service Grid		Server
LeaseManager$Reaper SPACE_NAME	See the Lease Manager for details	Single Thread per space	Server
Cache PersistentGC	Responsible for backup activities (cleanup indexes)	Single Thread per space	Server
SPACE_NAME BackgroundFifoThread3_Notify=false#	Threads that use segmentation in order to handle background events like handling waiting templates in a fifo fashion	Thread pool per space	Server
SPACE_NAME BackgroundFifoThread3_Notify=true#	Threads that use segmentation in order to handle background notify events in a fifo fashion	Thread pool per space	Server
Statistics-Task			Server
SPACE_NAME Batch Notifier	Used when using batch notifications. See the Batch Events for details.	Single Thread per space	Server
ActiveFailureDetector	Responsible for the active election process. See the Failure Detection for details.	Single Thread	Server
ProvisionLeaseManager	Used by the Service Grid	Single Thread	Server
Watchdog	See the Communication Protocol for details.	Single Thread per proxy	Client
Scheduled System Boot Thread	Used when the system starts	Single Thread	Server
SLAThresholdTaskPool#	Used by the Service Grid	Single Thread	Server
CapabilityChannel	Used by the Service Grid	Single Thread	Server
DynamicSmartStub-InvHandlerCache-SelfCleaningTable$Cleaner	Used by LRMI for background cleanup	Single Thread	Server
ClassLoaderCache-SelfCleaningTable$Cleaner	Used by LRMI to cleanup unused classes	Single Thread	Server
ProvisionFailurePool#	Used by the Service Grid. Monitors the running services		Server - GSM Grid Service Manager. This is is a service grid component that manages a set of Grid Service Containers (GSCs). A GSM has an API for deploying/undeploying Processing Units. When a GSM is instructed to deploy a Processing Unit, it finds an appropriate, available GSC and tells that GSC to run an instance of that Processing Unit. It then continuously monitors that Processing Unit instance to verify that it is alive, and that the SLA is not breached.
ProvisionPool#	Used by the Service Grid. Monitors the running services		Server - GSM
ProvisionMonitorEventPool#	Used by the Service Grid. Monitors the running services		Server - GSM
Reggie Comm Task-pool#	Used by the Service Grid. Monitors the running services		Server - GSM
SDM Cache Task	Used by the Service Grid.		Server - GSM
unicast request	Used by the Service Grid.		Server - GSM
service expire	Used by the Service Grid.		Server - GSM
Webster Runner	Used by the Service Grid.		Server - GSM
Event Lease Manager	Used by the Service Grid.		Server - GSM
Fault Detection Handler	Used by the Service Grid.		Server - GSM