Max messages in Message Queue
Aleix Conchillo Flaqué
aconchillo at ice.csic.es
Tue Jun 16 07:45:43 UTC 2009
On Tue, Jun 16, 2009 at 09:20, Samuel Bitton<S.Bitton at sstl.co.uk> wrote:
> It cannot be too many queues as I can create the queue ok with 100
> messages in it.
> Note that I get the error when I call create with 500 messages.
> Also note that I don't think it is a memory issue as for 100 messages
> the message size is set to 33 bytes and for the 500 messages case, I set
> the message size to 5 bytes only. So in theory this would require as
> much memory (unless RTEMS uses a lot of overhead on a per message
> So to me there is a limiting factor for the number of messages per
I'm not sure if this will be the problem, but if you are running 4.7
or older you might need to setup CONFIGURE_MEMORY_OVERHEAD which adds
space in the workspace for message queue buffers. Buffers are not
taken into account when reserving memory for message queues.
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