Solutions

What causes this error: "incompatible shared memory protocol detected."

Note: Applies to RTI Connext 4.x and above. The following error: [D0004|CREATE Participant|D0004|ENABLE] NDDS_Transport_Shmem_is_segment_compatible:incompatible shared memory protocol detected. Current version 1.0 not compatible with 2.0. is caused when two applications, one using RTI Connext DDS 4 ...
bobby
Wed, 02/06/2013 - 14:05
6202 reads — 0 comments

How do I separate the transport used for discovery data from the transport used for user data?

Note: Applies to RTI Connext version 4.x and above OMG Data Distribution Service (DDS) applications send two types of data: meta data used for discovery and user data. Because the core of RTI Connext DDS is transport agnostic, it does not make any assumptions about the actual transports used to ...
erin
Fri, 02/01/2013 - 17:18
6676 reads — 0 comments

Why shouldn't I use DDS_String_dup() to initialize string data?

Note: This solution applies to RTI Data Distribution Service 4.x. The description in this FAQ only applies to data instances that are allocated with FooTypeSupport::create_data(), which pre-allocates the strings. (It does not apply to situations in which the data instance is allocated on the stack ...
Victor
Wed, 01/30/2013 - 17:09
13770 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
3789 reads — 0 comments

How do I tune the network buffering in VxWorks 5.4?

Note: Applies to NDDS 3.0 and VxWorks 5.4. Introduction The VxWorks TCP/IP stack uses a fixed amount of buffers. The buffers and their sizes are configured in the kernel. This is different from non real-time OSs, where the buffers can be taken as needed from main memory. In many NDDS applications ...
abhi
Thu, 01/17/2013 - 13:22
25915 reads — 0 comments

Example Code - Aggregation

Note: Applies to RTI Data Distribution Service 4.1, 4.2; While the design pattern also works for RTI Data Distribution Service 4.3 and above, its batching feature is a better way to achieve aggregation. Purpose Publisher This example shows how to create an application that aggregates data. This ...
erin
Thu, 01/17/2013 - 13:15
5208 reads — 0 comments

How do I set the multicast_receive_addresses when using rtiddsping and rtiddsspy?

Note: Applies to RTI Data Distribution Service 4.3x and above, Both rtiddsping and rtiddsspy can be configured to use multicast for discovery announcements by specifying a multicast address as part of the initial peer list (using -preer <PEER> ). However, rtiddsping and rtiddsspy do not have ...
vishal
Thu, 01/17/2013 - 13:01
6753 reads — 0 comments

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