Linux

High CPU usage after SHMEM resources are removed by a third-party

The shared memory built-in transport in RTI Connext uses IPC segments and semaphores under the hood to perform DDS communication between DomainParticipants. It is important that those IPC resources are not destroyed while RTI Connext applications are using them. Failure to do so may result in ...
scardenete
Wed, 02/14/2024 - 08:41
330 reads — 0 comments

What does the warning PRESWriterHistoryDriver_completeBeAsynchPub:!make_sample_reclaimable mean?

When using asynchronous publication and Best Effort reliability, you may see the warning: PRESWriterHistoryDriver_completeBeAsynchPub:!make_sample_reclaimable in topic 'MyTopic' This warning message may be caused by a small history depth you are configuring. Since you are using asynchronous ...
grayson
Mon, 03/27/2023 - 16:05
793 reads — 0 comments

Eliminating OS-induced jitter on Linux-like platforms

Jitter when making API calls can result in inconsistent execution time for making those calls. For example, the median call to return_loan() may take ~4,500 nanoseconds, but there could be execution outliers that take 5-10x this median time. What could cause this kind of behavior? The cause of such ...
grayson
Tue, 05/24/2022 - 16:27
2157 reads — 0 comments

Using Connext Pro with Linux RT_PREEMPT Kernel

Connext applications can enjoy consistent "me-first" execution by running at an elevated priority on the Linux RT_PREEMPT kernel. RT_PREEMPT is a kernel enhancement that enables real-time preemption and settable priorities for processes and threads, similar to an RTOS. This can be put to use for ...
neil-rti
Tue, 10/12/2021 - 20:43
1699 reads — 0 comments

How to use the Real-Time WAN Transport

In Connext DDS Professional 6.1.0 and above, a new UDP-based transport is available for communicating over a wide area network (WAN). The Real-Time WAN Transport is a smart transport that enables secure, scalable, and high-performance communication over WANs, including public networks. Real-Time ...
grayson
Thu, 05/20/2021 - 13:03
2827 reads — 0 comments

The Connext Installer on Linux Systems and Restrictive umask Settings

When using certain restrictive umask settings, the RTI Connext installer may cause the GNOME desktop environment to lock up and prevent access to the desktop environment of a device. You can work around this issue by setting a more permissive umask, running the installer, and restoring the restrictive umask afterward. ...
Ian Wiggins
Wed, 05/12/2021 - 08:03
1808 reads — 1 comment

How do I create a Connext DDS application with RTI Code Generator and build it on my embedded target with an Arm CPU?

This article describes the procedure to build and run Code Generator ( rtiddsgen ) examples directly on an embedded target. We will use a Raspberry Pi for this example, but the procedure is similar for other embedded targets. In order to build directly on the target, the target must include a ...
irwin
Thu, 07/23/2020 - 14:18
4934 reads — 3 comments

Using RTI Connext DDS on the NVIDIA Jetson Nano

Preface: The vast majority of this article was extracted from a White Paper that RTI's Don Gochenour originally authored. Don is a Senior Application Engineer with extensive knowledge in embedded systems and RTI's products. Don is located on the East coast of the US. Introduction This content piece ...
garyb
Wed, 07/22/2020 - 17:26
4302 reads — 0 comments

Advanced data access using Connector (Javascript)

Introduction RTI Connector offers a simplified API to Data Distribution Service. Different than the full DDS API, this lightweight API does not offer a one-to-one data mapping between the published or subscribed to datatype defined by the language (Javascript/Python). For example, if you use the C ...
fabrizio
Thu, 02/13/2020 - 14:49
2179 reads — 0 comments

How do I configure RTI Connext Micro to use DDS Security with no external configuration files?

Note: Applies to RTI Connext DDS Micro 3.x and above Configuration via external files often isn’t allowed in certified applications, such as those used by the automotive industry. In such cases, the keys, governance, and permissions configuration used by RTI Security Plugins should be specified ...
grayson
Wed, 10/16/2019 - 15:48
2415 reads — 2 comments

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