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IPCS, Shared Memory
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IPCS Shared Memory, Message Queues and SemaphoresThose important parameters are described in each man page and on thousands of web pages.
We hope that our two graphics make it more easy to understand them. If you consider this page as helpful, then share it with others:
IPCS Message QueuesView full size
IPCS Shared MemoryView full size ipcs -qa displays information about IPCS-Queues
ipcs -qa |grep -v "0 0" lists only IPCS-Queues which have waiting messages (There are 5 spaces between "0 0")
A value "1" for QNUM means, that there is one message waiting behind that message which is currently being processed (active); that means that there are indeed 2 messages in that queue.
ipcs -aq -D0 ("D-Zero") prints content of the message queues
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