Hi,
I finally figured out how to use jconsole remotely (I had a
misunderstanding
of what value to use in -Djava.rmi.server.hostname=<host>, using the
jconsole's
machine's IP address instead of the target).
Going back to running unit tests based on both libstomp and activemq-cpp
(2.2.1),
I can see, using jconsole, the Heap usage continuously rise (albeit with
a sawtooth),
and then reach its limit. At this point the unit tests halt. What
seems
the most interesting of all the Memory Pools is the "Tenured Gen" which
eventually
plateau's when the Used=Committed=Max. The activemq.log, which
periodically has
the KahaDB slow messages or PageFile flush messages, suddenly stops. No
interesting
messages. (by the way I reduced the heap down to 64M to get it to
saturate quicker).
I'm not really sure where to look. So I took a look at the MBeans. The
AMQ-BROKER
attributes shows
StorePercentUsage = 56
TotalDequeueCount = 214618
TotalEnqueueCount = 429046
TotalMessageCount = 214428
MemoryLimit = 20971520
StoreLimit = 104857600
TotalConsumerCount=2
I've read a little about the Total Enqueue/Message/Dequeue counters, but
still
don't understand how they relate to each other. A picture would be
worth a
thousand words.
The setup is fairly simple right now, sending persistent messages.
Producer - - > JMS Queue - - > Server - - > JMS Durable Topic - - >
Consumer
The Queue shows
DequeueCount = 214618
DispatchCount = 214618
EnqueCount = 214618
MemoryPercentUsage = 0
The Topic seems more interesting
DequeueCount = 0
DispatchCount = 214236
EnqueueCount = 214428
MemoryPercentUsage = 0
Is it strange that the Dequeue Count for the Topic is zero? I know the
consumer of the Topic is receiving messages. Why would the Dequeue
Count
be zero? Is the consumer suppose to be doing something that it's not?
Any other places in jconsole I should be looking to determine where all
the heap is going?
Thanks!
Peter P
-----Original Message-----
From: Peter P [mailto:ppoth...@crossbeamsys.com]
Sent: Wednesday, March 17, 2010 5:56 PM
To: users@activemq.apache.org
Subject: ActiveMQ 5.3.0 Memory Usage - Connections
Hi,
We are using ActiveMQ 5.3.0, with both libstomp and ActiveMQ-CPP
producer
and consumer clients,
sending persistent messages to both queues and topics. We have noticed
the
amount of memory used
by ActiveMQ (reported by linux top) grows over time.
Trying to determine whether the memory grew in response to messages or
connections, we noticed
using a python script based on stomppy-2.0.4-1cb, that ActiveMQ memory
grew
rather quickly when
we connected and disconnected multiple times.
Here's the basis of the script
for i in range (0,1000) :
conn = stomp.Connection()
conn.set_listener('', MyListener())
conn.start()
conn.connect()
conn.disconnect()
Using jmap/jhat, here's the most popular Instance Counts and Histogram
prior
to running the script
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
29892 root 19 0 823m 95m 10m S 0.0 2.4 0:07.86 java
All Classes (excluding platform)
Class Instance Count Total Size
class [B 6288 7214080
class [C 26005 2285484
class [I 4775 916612
class java.lang.reflect.Method 6971 899259
class java.lang.Class 4802 691488
class java.lang.String 25732 514640
class [Ljava.util.HashMap$Entry; 3240 514504
class [S 6384 396498
class [Ljava.lang.Object; 4263 378984
class [Lorg.apache.activemq.command.DataStructure; 2 262160
class java.util.LinkedHashMap$Entry 4471 196724
Instance Counts for All Classes (including platform)
26005 instances of class [C
25732 instances of class java.lang.String
6971 instances of class java.lang.reflect.Method
6741 instances of class [Ljava.lang.Class;
6384 instances of class [S
6288 instances of class [B
5806 instances of class java.util.HashMap$Entry
4802 instances of class java.lang.Class
4775 instances of class [I
4471 instances of class java.util.LinkedHashMap$Entry
4263 instances of class [Ljava.lang.Object;
and after running the script a bunch of times
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
29892 root 18 0 880m 153m 10m S 0.0 3.9 0:35.62 java
Heap Histogram
All Classes (excluding platform)
Class Instance Count Total Size
class [B 9880 16696961
class [C 32597 3238584
class [I 4823 2948344
class java.util.concurrent.ConcurrentHashMap$Segment 65216 2086912
class java.util.concurrent.locks.ReentrantLock$NonfairSync 66712
1867936
class [Ljava.util.concurrent.ConcurrentHashMap$HashEntry; 65216
1570048
class [Ljava.util.HashMap$Entry; 6575 1022200
class java.lang.reflect.Method 6895 889455
class java.lang.Class 4832 695808
class java.lang.String 31143 622860
class [Ljava.util.concurrent.ConcurrentHashMap$Segment; 4076
586944
class org.apache.activemq.command.ActiveMQMessage 1812 467496
class [S 6077 370234
class java.util.HashMap$Entry 11704 327712
class [Ljava.lang.Object; 5130 318360
class java.net.SocksSocketImpl 1755 282555
class [Lorg.apache.activemq.command.DataStructure; 2 262160
class java.util.HashMap 5182 248736
class java.util.concurrent.ConcurrentHashMap 4076 228256
class java.util.LinkedHashMap$Entry 4155 182820
Instance Counts for All Classes (including platform)
66712 instances of class
java.util.concurrent.locks.ReentrantLock$NonfairSync
65216 instances of class java.util.concurrent.ConcurrentHashMap$Segment
65216 instances of class
[Ljava.util.concurrent.ConcurrentHashMap$HashEntry;
32597 instances of class [C
31143 instances of class java.lang.String
11704 instances of class java.util.HashMap$Entry
9880 instances of class [B
9371 instances of class java.lang.Object
6895 instances of class java.lang.reflect.Method
6575 instances of class [Ljava.util.HashMap$Entry;
6143 instances of class [Ljava.lang.Class;
6077 instances of class [S
5182 instances of class java.util.HashMap
5130 instances of class [Ljava.lang.Object;
4832 instances of class java.lang.Class
4823 instances of class [I
Here are the diffs between our config file and activemq-demo.xml
51c51
< <broker xmlns="http://activemq.apache.org/schema/core";
brokerName="amq-broker" useJmx="true">
---
> <broker xmlns="http://activemq.apache.org/schema/core";
> brokerName="amq-broker" persistent="true" useJmx="true">
68c68
< <policyEntry queue=">" producerFlowControl="true"
memoryLimit="5mb"/>
---
> <policyEntry queue=">" producerFlowControl="false"
> memoryLimit="5mb"/>
76a77,79
> <messageEvictionStrategy>
> <oldestMessageEvictionStrategy/>
> </messageEvictionStrategy>
81d83
< -->
82a85,87
> <timedSubscriptionRecoveryPolicy
> recoverDuration="60000" />
> -->
> <fixedCountSubscriptionRecoveryPolicy
> maximumSize="300" />
83a89
>
88a95,96
>
>
197c205
< <!-- Create a TCP transport that is advertised on via an
IP
multicast
---
> <!-- Create a TCP transport that is NOT advertised on via
an
> IP multicast
199c207
< <transportConnector name="openwire"
uri="tcp://localhost:61616" discoveryUri="multicast://default"/>
---
> <transportConnector name="openwire"
>
uri="tcp://localhost:61616?transport.keepAliveResponseRequired=true;wire
Format.tcpNoDelayEnabled=true"/>
204c212
< <transportConnector name="stomp"
uri="stomp://localhost:61613"/>
---
> <transportConnector name="stomp"
> uri="stomp://localhost:61613?wireFormat.tcpNoDelayEnabled=true"/>
208a217,219
>
>
>
325c336,337
< </beans>
\ No newline at end of file
---
>
> </beans>
Checking the ActiveMQ 5.3.1 Fixed Issues page
http://issues.apache.org/activemq/browse/AMQ/fixforversion/12183
this sounds different from any issue.
We run with only a single instance of ActiveMQ.
Are there any configuration parameters that controls this behavior?
Does ActiveMQ normally grow this large, cleaning up periodically?
Is this normal behavior? Is there something I should be looking for?
Thanks,
Peter P
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