Sample Memory Management QoS

Use these QoS fields to configure how Connext manages memory related to the samples that are stored and managed by the DataReader and DataWriter queues.

Use these QoS fields to configure how Connext manages memory related to the samples that are stored and managed by the DataReader and DataWriter queues.

Basic Settings

DDS_ResourceLimitsQosPolicy	max_samples
	<<basic>> <<spec>> Represents the maximum samples the middleware can store for any one DDSDataWriter (or DDSDataReader).
DDS_ResourceLimitsQosPolicy	max_instances
	<<basic>> <<spec>> Represents the maximum number of instances a DDSDataWriter (or DDSDataReader) can manage.
DDS_ResourceLimitsQosPolicy	initial_samples
	<<basic>> <<extension>> Represents the initial samples the middleware will store for any one DDSDataWriter (or DDSDataReader).
DDS_ResourceLimitsQosPolicy	initial_instances
	<<basic>> <<extension>> Represents the initial number of instances a DDSDataWriter (or DDSDataReader) will manage.

Advanced Settings

DDS_PersistentStorageSettings	writer_instance_cache_allocation
	<<extension>> Configures the resource limits associated with the instance durable writer history cache.
DDS_PersistentStorageSettings	writer_sample_cache_allocation
	<<extension>> Configures the resource limits associated with the sample durable writer history cache.
DDS_DurabilityServiceQosPolicy	history_kind
	<<spec>> The kind of history to apply in recouping durable data.
DDS_DurabilityServiceQosPolicy	history_depth
	<<spec>> Setting to use for the DDS_DurabilityQosPolicy::writer_depth when recouping durable data.
DDS_DurabilityServiceQosPolicy	max_samples
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.
DDS_DurabilityServiceQosPolicy	max_instances
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.
DDS_DurabilityServiceQosPolicy	max_samples_per_instance
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.
DDS_ResourceLimitsQosPolicy	max_samples_per_instance
	<<spec>> Represents the maximum number of samples of any one instance a DDSDataWriter (or DDSDataReader) can manage.
DDS_WriterDataLifecycleQosPolicy	autodispose_unregistered_instances
	<<spec>> Boolean flag that controls whether or not a writer will also dispose of an instance when the DDSDataWriter unregisters from the instance by means of the unregister operations.
DDS_WriterDataLifecycleQosPolicy	autopurge_unregistered_instances_delay
	<<extension>> Maximum duration for which the DDSDataWriter will maintain information regarding an instance once it has unregistered the instance.
DDS_WriterDataLifecycleQosPolicy	autopurge_disposed_instances_delay
	<<extension>> Maximum duration for which the DDSDataWriter will maintain information regarding an instance once it has disposed the instance.
DDS_ReaderDataLifecycleQosPolicy	autopurge_nowriter_samples_delay
	<<spec>> Minimum duration for which the DDSDataReader will maintain samples for an instance once its instance_state becomes DDS_NOT_ALIVE_NO_WRITERS_INSTANCE_STATE.
DDS_ReaderDataLifecycleQosPolicy	autopurge_disposed_samples_delay
	<<spec>> Minimum duration for which the DDSDataReader will maintain samples for an instance once its instance_state becomes DDS_NOT_ALIVE_DISPOSED_INSTANCE_STATE.
DDS_ReaderDataLifecycleQosPolicy	autopurge_disposed_instances_delay
	<<extension>> Minimum duration for which the DDSDataReader will maintain information about a received instance once its instance_state becomes DDS_NOT_ALIVE_DISPOSED_INSTANCE_STATE and there are no samples for the instance in the DataReader queue.
DDS_ReaderDataLifecycleQosPolicy	autopurge_nowriter_instances_delay
	<<extension>> Minimum duration for which the DDSDataReader will maintain information about a received instance once its instance_state becomes DDS_NOT_ALIVE_NO_WRITERS_INSTANCE_STATE and there are no samples for the instance in the DataReader queue.
DDS_DataReaderResourceLimitsQosPolicy	max_fragmented_samples
	<<extension>> The maximum number of samples for which the DDSDataReader may store fragments at a given point in time.
DDS_DataReaderResourceLimitsQosPolicy	initial_fragmented_samples
	<<extension>> The initial number of samples for which a DDSDataReader may store fragments.
DDS_DataReaderResourceLimitsQosPolicy	max_fragmented_samples_per_remote_writer
	<<extension>> The maximum number of samples per remote writer for which a DDSDataReader may store fragments.
DDS_DataReaderResourceLimitsQosPolicy	max_fragments_per_sample
	<<extension>> Maximum number of fragments for a single sample.
DDS_DataReaderResourceLimitsQosPolicy	dynamically_allocate_fragmented_samples
	<<extension>> Determines whether the DDSDataReader pre-allocates storage for storing fragmented samples.
DDS_DataWriterResourceLimitsQosPolicy	initial_batches
	<<extension>> Represents the initial number of batches a DDSDataWriter will manage.
DDS_DataWriterResourceLimitsQosPolicy	max_batches
	<<extension>> Represents the maximum number of batches a DDSDataWriter will manage.
DDS_DataWriterResourceLimitsQosPolicy	writer_loaned_sample_allocation
	<<extension>> Represents the allocation settings of loaned samples managed by a DDSDataWriter.
DDS_DataWriterResourceLimitsQosPolicy	initialize_writer_loaned_sample
	<<extension>> Whether or not to initialize loaned samples returned by a DDSDataWriter
DDS_DiscoveryConfigQosPolicy	participant_reader_resource_limits
	<<extension>> Resource limits.
DDS_DiscoveryConfigQosPolicy	publication_reader_resource_limits
	<<extension>> Resource limits.
DDS_DiscoveryConfigQosPolicy	subscription_reader_resource_limits
	<<extension>> Resource limits.
DDS_DiscoveryConfigQosPolicy	participant_configuration_reader_resource_limits
	<<extension>> Resource limits for the built-in topic participant configuration reader.
DDS_BuiltinTopicReaderResourceLimits_t	initial_samples
	<<extension>> Initial number of samples.
DDS_BuiltinTopicReaderResourceLimits_t	max_samples
	<<extension>> Maximum number of samples.