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From "Pavel Moravec (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-7182) [C++ broker] high CPU usage on backup brokers following QPID-7149 scenario
Date Mon, 04 Apr 2016 06:18:25 GMT
Pavel Moravec created QPID-7182:
-----------------------------------

             Summary: [C++ broker] high CPU usage on backup brokers following QPID-7149 scenario
                 Key: QPID-7182
                 URL: https://issues.apache.org/jira/browse/QPID-7182
             Project: Qpid
          Issue Type: Bug
          Components: C++ Clustering
    Affects Versions: qpid-cpp-next
            Reporter: Pavel Moravec
            Assignee: Alan Conway


Following scenario from QPID-7149 with --ha-replicate=all, with whatever patch fixing it applied
or not, CPU usage of backup brokers grow over the time.

gdb shows one active thread always with backtrace:

{noformat}
#0  0x00007f9295fc9c98 in find (this=0x7f9270055840, data=<value optimized out>)
    at /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/tr1_impl/hashtable:786
#1  qpid::ha::QueueReplicator::dequeueEvent (this=0x7f9270055840, data=<value optimized
out>)
    at /data_xfs/qpid/cpp/src/qpid/ha/QueueReplicator.cpp:306
#2  0x00007f9295fca82b in operator() (this=0x7f9270055840, deliverable=<value optimized
out>)
    at /usr/include/boost/function/function_template.hpp:1013
#3  qpid::ha::QueueReplicator::route (this=0x7f9270055840, deliverable=<value optimized
out>)
    at /data_xfs/qpid/cpp/src/qpid/ha/QueueReplicator.cpp:329
#4  0x00007f9296b9b854 in qpid::broker::SemanticState::route (this=0x7f927001d088, msg=...,
strategy=...)
    at /data_xfs/qpid/cpp/src/qpid/broker/SemanticState.cpp:506
#5  0x00007f9296bb8ab7 in qpid::broker::SessionState::handleContent (this=0x7f927001cec0,
frame=<value optimized out>)
    at /data_xfs/qpid/cpp/src/qpid/broker/SessionState.cpp:233
#6  0x00007f9296bb90a1 in qpid::broker::SessionState::handleIn (this=0x7f927001cec0, frame=...)
    at /data_xfs/qpid/cpp/src/qpid/broker/SessionState.cpp:293
#7  0x00007f92965d4c31 in qpid::amqp_0_10::SessionHandler::handleIn (this=0x7f927002fbb0,
f=...)
    at /data_xfs/qpid/cpp/src/qpid/amqp_0_10/SessionHandler.cpp:93
#8  0x00007f9296b29a2b in operator() (this=0x7f9270002060, frame=...) at /data_xfs/qpid/cpp/src/qpid/framing/Handler.h:39
#9  qpid::broker::ConnectionHandler::handle (this=0x7f9270002060, frame=...)
    at /data_xfs/qpid/cpp/src/qpid/broker/ConnectionHandler.cpp:93
#10 0x00007f9296b247e8 in qpid::broker::amqp_0_10::Connection::received (this=0x7f9270001e80,
frame=...)
    at /data_xfs/qpid/cpp/src/qpid/broker/amqp_0_10/Connection.cpp:198
#11 0x00007f9296ab2863 in qpid::amqp_0_10::Connection::decode (this=0x7f92700018b0, buffer=<value
optimized out>, 
    size=<value optimized out>) at /data_xfs/qpid/cpp/src/qpid/amqp_0_10/Connection.cpp:59
#12 0x00007f92965fdca0 in qpid::sys::AsynchIOHandler::readbuff (this=0x7f92700009b0, buff=0x7f9270001880)
    at /data_xfs/qpid/cpp/src/qpid/sys/AsynchIOHandler.cpp:138
#13 0x00007f929657be89 in operator() (this=0x7f9270000a50, h=...) at /usr/include/boost/function/function_template.hpp:1013
#14 qpid::sys::posix::AsynchIO::readable (this=0x7f9270000a50, h=...) at /data_xfs/qpid/cpp/src/qpid/sys/posix/AsynchIO.cpp:453
#15 0x00007f92966025b3 in boost::function1<void, qpid::sys::DispatchHandle&>::operator()
(this=<value optimized out>, 
    a0=<value optimized out>) at /usr/include/boost/function/function_template.hpp:1013
#16 0x00007f9296601246 in qpid::sys::DispatchHandle::processEvent (this=0x7f9270000a58, type=qpid::sys::Poller::READABLE)
    at /data_xfs/qpid/cpp/src/qpid/sys/DispatchHandle.cpp:280
#17 0x00007f92965a1d1d in process (this=0x7961c0) at /data_xfs/qpid/cpp/src/qpid/sys/Poller.h:131
..
{noformat}

or with:

{noformat}
#0  0x00000032c4c0a7b0 in pthread_mutex_unlock () from /lib64/libpthread.so.0
#1  0x00007fb0958038fa in qpid::sys::Mutex::unlock (this=<value optimized out>) at /data_ext4/qpid/cpp/src/qpid/sys/posix/Mutex.h:120
#2  0x00007fb095840628 in ~ScopedLock (this=0x112cfd0, data=<value optimized out>) at
/data_ext4/qpid/cpp/src/qpid/sys/Mutex.h:34
#3  qpid::ha::QueueReplicator::dequeueEvent (this=0x112cfd0, data=<value optimized out>)
    at /data_ext4/qpid/cpp/src/qpid/ha/QueueReplicator.cpp:308
..
{noformat}

Not sure where the busy loop origins.



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