Broker does not release memory to OS
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Key: QPID-3771
URL: https://issues.apache.org/jira/browse/QPID-3771
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: 0.12
Environment: Ubuntu 10.0.4
Reporter: Jeff Armstrong
After adding a bunch of messages to queues on a broker with default options,
then dequeuing them all, the resident memory (RSS) of the broker does not
decrease. This is expected if the OS does not request the memory to be
returned, but if you starve the system of memory, the OS should request this
memory, but it still doesn't decrease. Somehow the broker is holding onto all
of the memory used for previously allocated messages, and the OS is unable to
ever retrieve the freed memory.
To reproduce:
- Create broker, direct exchange, and a queue with a binding, all with default
options (or set a max size for the queue)
- From a client send a bunch of large messages to the queue, enough to use up
most of your memory (note the RSS of the broker)
- From a client dequeue all of the messages from the queue (note the RSS of the
broker has not decreased)
- Start some other application that would use more memory than is available,
which should force the OS to request freed memory from the Qpid broker (note
the RSS of the broker still has not decreased)
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