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https://issues.apache.org/jira/browse/QPID-7677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Gemmell updated QPID-7677:
---------------------------------
Affects Version/s: qpid-cpp-1.36.0
> [C++ broker] broker requires much more memory for AMQP1.0 subscription than
> for 0-10 one
> ----------------------------------------------------------------------------------------
>
> Key: QPID-7677
> URL: https://issues.apache.org/jira/browse/QPID-7677
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Broker
> Affects Versions: 0.32, qpid-cpp-1.36.0
> Reporter: Pavel Moravec
> Assignee: Alan Conway
> Labels: memory
> Fix For: qpid-cpp-1.37.0
>
> Attachments: memdiff.sh
>
>
> Having an AMQP 1.0 consumer of a queue increases memory usage of qpidd by
> much more than having an AMQP 0-10 consumer - the difference is approx. 0.5MB.
> This affects scalable usage of the broker, where having thousands of 1.0
> consumers require gigabytes of memory.
> Trivial test:
> {code}
> qpid-config add queue qqq
> for i in $(seq 1 10); do qpid-receive -a qqq -f & sleep 0.1; done
> # this added small 26kB VSZ and 75kB RSS per one consumer/receiver
> for i in $(seq 1 10); do qpid-receive -a qqq -f --connection-options
> "{protocol:'amqp1.0'}" & sleep 0.1; done
> # this added 640kB VSZ and 805kB RSS per one consumer/receiver
> {code}
> Better test: have multiple consumers on the same AMQP connection (I can
> provide such program in case of interest).
> Running such scenario under valgrind/massif showed the extra memory is
> consumed by:
> ->91.90% (143,361,792B) 0x5D544F1:
> qpid::broker::amqp::OutgoingFromQueue::OutgoingFromQueue(qpid::broker::Broker&,
> std::string const&, std::string const&,
> boost::shared_ptr<qpid::broker::Queue>, pn_link_t*,
> qpid::broker::amqp::Session&, qpid::sys::OutputControl&,
> qpid::broker::SubscriptionType, bool, bool) (Outgoing.h:57)
> And really, when I changed in:
> https://github.com/apache/qpid-cpp/blob/master/src/qpid/broker/amqp/Outgoing.cpp#L68
> the "deliveries(5000)" to "deliveries(50)", memory consumption dramatically
> decreased.
> I don't understand this part of code, but please make the
> "CircularArray<Record> deliveries(5000)" more memory efficient.
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