performance

Participant Discovery Performance Characterization and Guidance: SPDP vs. SPDP2

Overview & Summary Participant discovery in RTI Connext Professional allows DomainParticipant entities to discover each other automatically across a network. The legacy Simple Participant Discovery Protocol (SPDP) periodically broadcasts full participant declarations via DATA(p) messages (~800 ...
jlopez
Mon, 10/26/2026 - 04:14
47 reads — 0 comments

Why DataWriter::write() execution time can grow with local multicast subscribers

Summary On Linux/Windows and potentially other operating systems, when a DataWriter sends data samples to a multicast address, the performance of the underlying UDP sendmsg() call varies depending on whether multicast DataReaders are located on the same local host. If there are no local, multicast ...
grayson
Fri, 08/01/2025 - 15:51
5053 reads — 0 comments

Improve performance accessing types containing sequences and arrays in RTI Connector

Due to the way in which RTI Connector handles data internally, some applications may suffer slower performance when using types that contain sequences. This is a known issue and is tracked internally in CON-42 . More specifically, this issue is seen when setting or getting a type that contains a ...
samr
Tue, 06/02/2020 - 06:30
8239 reads — 4 comments

Configuring DDS to mitigate performance degradation due to packet loss

If you are using Reliable communication, you could see a performance degradation due to packet loss and resending data sample fragments. This is more probable when using data bigger than 1500 Bytes (over Ethernet). In general, a DDS application using a transport such as UDPv4 splits data samples ...
sara
Wed, 07/19/2017 - 02:29
10458 reads — 0 comments

Why is the discovery phase taking so long on my Windows system?

Description The discovery phase in DDS applications can be considered a high throughput scenario under some circumstances. Some examples are: The applications have a lot of DDS entities. More than 2 hosts are involved. The type definitions are sent within the discovery packets (i.e., TypeCode and ...
Juanjo Martin
Thu, 05/28/2015 - 06:57
12696 reads — 1 comment

How to reduce latency in Windows by disabling the Interrupt coalescing

Interrupt coalescing refers to the ability of the NIC to not interrupt the CPU immediately whenever a packet is received, but rather wait a little bit in the hope that more packets arrive. That way a single interrupt can be used to process multiple packets. This decision represent a tradeoff ...
Juanjo Martin
Mon, 04/20/2015 - 04:58
115230 reads — 0 comments

How can I reduce the discovery time?

For complex systems with hundreds of participants and endpoints, discovery may cause long startup times and high network utilization. There are several options that help increase discovery performance: 1) Reduce the size of discovery packets 1.1. You can configure the middleware to not send the ...
Juanjo Martin
Thu, 08/07/2014 - 03:00
80012 reads — 0 comments

What should I consider when testing RTI Connext performance on Gig-E/Infiniband networks?

Performance is a function of how well hardware and software components work together with the middleware. The relationship is certainly not easily predictable. With very fast hardware, the limitation seems to be the hardware bus speed. The PCI just cannot keep up and this leads to high CPU ...
aida
Fri, 01/18/2013 - 03:32
4597 reads — 0 comments

How do I tune the SENS/TORNADO 2.0 Network Stack?

SENS/TORNADO 2.0 NETWORK STACK CONFIGURATION/PERFORMANCE ISSUES -------------------------------- 1. INTRODUCTION 1.1 NETWORK STACK VERSIONS 1.2 NET POOLS 1.2.1 CLUSTERS 1.2.2 CLUSTER BLOCKS 1.2.3 MBLOCKS 1.3 RECEIVING: DATA FLOW FROM DRIVER TO APPLICATION LEVEL 1.4 SENDING: DATA FLOW FROM ...
waffletchnlgy
Thu, 01/17/2013 - 12:35
13688 reads — 0 comments

Example Code - Achieving 'Batching' by setting push-on-write to false

Note: Applies to RTI Connext 4.0 and above. This example shows how to achieve batching without using the Batch QoS policy (which was introduced in 4.4). Publisher This Publisher sends out bursts of 32 keyed reliable samples at 20Hz. The point here is that the dataWriterQos.protocol.push_on_write = ...
ken
Thu, 01/17/2013 - 12:32
7271 reads — 0 comments

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