why does this error happened? "incompatible shared memory segment found"

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why does this error happened? "incompatible shared memory segment found"

Hi,

    I start 22 programs on the same computer, and some error come out.

    "incompatible shared memory segment found.\n  All applications using NDDS must use compatible shared memory protocols."

    I use the default setting properties for shmem, and QOS setting like this

    datawriter_qos.writer_data_lifecycle.autodispose_unregistered_instances = TRUE;
    datawriter_qos.durability.kind = DDS_VOLATILE_DURABILITY_QOS;
    datawriter_qos.history.kind = DDS_KEEP_LAST_HISTORY_QOS;
    datawriter_qos.history.depth = 10;
    datawriter_qos.resource_limits.max_samples_per_instance = MAX_SAMPLES_PER_INSTANCE;
    datawriter_qos.destination_order.kind = DDS_BY_RECEPTION_TIMESTAMP_DESTINATIONORDER_QOS;

    datareader_qos.durability.kind = DDS_VOLATILE_DURABILITY_QOS;
    datareader_qos.history.kind = DDS_KEEP_LAST_HISTORY_QOS;
    datareader_qos.history.depth = 10;
    datareader_qos.resource_limits.max_samples_per_instance = MAX_SAMPLES_PER_INSTANCE;
    datareader_qos.destination_order.kind = DDS_BY_RECEPTION_TIMESTAMP_DESTINATIONORDER_QOS;

    What is the most posssible reason?

 

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rip
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This is documented. 

One of your publishers/subscribers is from an earlier version of RTI DDS. 

https://community.rti.com/search/site/incompatible%20shmem

 

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all of the programs are 5.2.0

rip
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mIght be a resource issue with # of shared memory segments available to the OS.  22 applications means 22 different participants, which could have issues in all sorts of resource constraints.

But otherwise... Dunno.