RTI Core Libraries and Utilities

How do I restrict and prioritize interfaces for RTI Connext to use?

(This article expands on the community post: How do I restrict RTI Connext to use only a subset of interfaces? ) On a machine with multiple NICs, users can restrict RTI Connext® traffic to a subset of the available network interfaces (NICs). RTI’s Connext DDS 7.3 introduced the capability to ...
mmohr
Tue, 12/17/2024 - 10:00
783 reads — 0 comments

Why do I see the WARNING message “PRESCstReaderCollator_getKey:instance not found”?

When processing a metadata sample that indicates the instance transition change to NOT_ALIVE_NO_WRITERS or NOT_ALIVE_DISPOSED, you may see the following WARNING messages when calling the get_key_value API: WARNING PRESCstReaderCollator_getKey:instance not found WARNING PRESPsReader_getKey:!collator ...
afernandez
Tue, 12/17/2024 - 07:10
362 reads — 0 comments

Why do I get an OSSL_STORE API error and crash when creating a secure participant on Linux?

On Linux systems, if you are creating a DomainParticipant with Security Plugins enabled, and your application is linked to both TensorFlow and OpenSSL , you may see errors like this: RTI_Security_Util_uriToStringOssl:OpenSSL function PEM_write_bio_X509 failed with error: error:0c00009b:ASN.1 ...
grayson
Tue, 11/12/2024 - 10:05
514 reads — 0 comments

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
1734 reads — 0 comments

Achieving low-jitter performance with Connext Pro

Achieving low jitter and more deterministic write times and real-time performance requires in-depth tuning at the OS layer and DDS layer. It tends to involve a long list of recommendations to apply e.g. you can see advice online that involves similar checklists. This article summarizes best practices, and we recommend exploring and testing all the recommendations listed here. ...
grayson
Wed, 11/22/2023 - 06:39
11923 reads — 0 comments

Why do I get 'User storage is not valid' error when I create a DDS Entity

The multiple APIs of Connext have an internal concept named User Storage, which is used to store API-specific data required for certain features. This concept is normally part of the DomainParticipant entities and is configured through code as a QoS. While the APIs will configure this concept ...
anunez
Fri, 10/20/2023 - 01:18
9431 reads — 0 comments

Enabling communication between SPDP and SPDP2 participants with Routing Service

Communication between participants using Simple Participant Discovery Protocol (SPDP) and Simple Participant Discovery Protocol 2.0 (SPDP2) is not possible by default. Both participant and endpoint discovery will fail to complete between an SPDP and SPDP2 participant. See Discovery Overview in the ...
olivia.dorencz
Mon, 02/06/2023 - 14:35
29477 reads — 0 comments

Which RTI library architecture should I use for my Linux platform?

To determine if your Linux platform is compatible with an RTI architecture, you will need to know the CPU architecture (e.g. x64 or ARM), GLIBC, and GLIBCXX versions in your target platform. To find the GLIBC library, here are the steps we recommend you run on your target platform: $ ldd `which ls ...
grayson
Wed, 02/01/2023 - 16:49
2271 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
3457 reads — 0 comments

How to uniquely identify a coherent set

Note : This article discusses the coherent_set_info field, which is only available in Connext Professional 6.1.0 and higher. The information about the coherent set that a sample belongs to is stored in the optional field coherent_set_info , which is part of the SampleInfo structure. This optional ...
plombardero
Tue, 05/10/2022 - 09:35
2161 reads — 0 comments

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