What causes this error: "NDDS_Transport_Shmem_attach_writer:incompatible shared memory segment found."

Submitted by irwin on Thu, 02/21/2013 - 12:36

Note: Applies to RTI Connext 4.x and above.

When you have multiple applications running on a single machine utilizing the shared memory transport this error will occur of when the shared memory transport property

dds.transport.shmem.builtin.parent.message_size_max is not consistent across all RTI Connext applications on the same host. The actual error will be as follows:

NDDS_Transport_Shmem_attach_writer:incompatible shared memory segment found.    Found segment with max message size 9216.  Needed 12345.

The error is saying that your application has its shared memory transport property message_size_max set to 12345. A writer is trying to communicate with a remote shared memory reader whose shared memory transport property message_size_max is set to 9216 (the default). This error can be resolved by making this property consistant across all your applications on the same host. 

Product:

Comments

RoadRunner

Thu, 10/31/2013 - 05:34

Note that RTI tools (Analyzer, Monitor, etc.) have their own QoS profile that will also need to be modified if the user changes the shared memory settings in their application.