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FlatData and ZeroCopy examples

Connext 6 introduces two features: Zero Copy Transfer over Shared Memory and FlatData Language Binding . These features enable the middleware to reduce the number of copies involved in sending a sample, resulting in lower latencies for large data. The following examples show how to use these ...
alexc
Mon, 01/21/2019 - 09:25
25294 reads — 0 comments

What are preemptive ACKNACK and preemptive heartbeat messages?

The DDS reliability protocol uses Heartbeat messages and ACKNACK messages to ensure the receipt of data. A DataReader sends an ACKNACK message in response to a DataWriter’s Heartbeat; this ACKNACK message indicates which samples the reader received, and which samples it has yet to receive. For ...
grayson
Mon, 01/07/2019 - 15:22
5088 reads — 0 comments

Does Endpoint Discovery use unicast or multicast?

Endpoint Discovery uses either unicast or multicast, depending on the situation. First, some background: Endpoint Discovery is the process used by endpoints (that is, DataReaders and DataWriters ) to locate each other before they can begin to communicate user data. When a DomainParticipant is ...
samr
Tue, 12/18/2018 - 09:52
5607 reads — 0 comments

Why do I get the message “DDS COMMENDSrWriterService_onSubmessage:!ACK ignored: number of active RR is > 1, but sum of RR at is 0”

The following message is an internal debugging message that is printed at REMOTE verbosity level: COMMENDSrWriterService_onSubmessage:!ACK ignored: number of active RR is > 1, but sum of RR at is 0 Seeing this message is expected during normal operation and it does not indicate that something is ...
bobby
Mon, 11/19/2018 - 09:04
3320 reads — 0 comments

Enabling monitoring library in an application may result in a valgrind memory leak report.

When enabling RTI Monitoring library via the QoS file, a Connext DDS application might report a memory leak when using valgrind for memory usage analysis. An example of the valgrind output for this memory leak is found at the end of this article. Please see this Knowledge Base article for more ...
bobby
Tue, 08/28/2018 - 16:03
3347 reads — 0 comments

What happens if I rename the RTI Connext DDS installation directory?

Note : Applies to RTI Connext 5.2.x and above. When you run an RTI Connext DDS host installer, the installation directory will always be like this: <default install path or user defined installation path>/rti_connext_dds-x.x.x . The installer itself adds the “ rti_connext_dds-x.x.x ”. If you ...
sonia
Wed, 07/25/2018 - 03:16
2495 reads — 0 comments

Persistence Service database locking issue when it ends ungracefully

Note: Applies to RTI Connext DDS 5.3.x If Persistence Service closes ungracefully (via Ctrl-C or the kill -9 command), a new Persistence Service instance will not be able to run. It will show the following error message: Database is already in use by another RTI Persistence Service or was ...
irene
Wed, 05/23/2018 - 05:58
2585 reads — 0 comments

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