Hello,
I've been trying how many MQTT connections I can have open at the same time
with Apollo 1.5, and I'm quite disappointed by the result. I find it hard
to believe that Apollo cannot do better, so it might be a configuration
issue. I'm adding MQTT clients, which publish a small message every 4
minutes, until Apollo stops accepting connections. When the number of
connections reaches 50000, it starts to go wrong (both CPU's get to 100% cpu
usage, and they don't recover anymore).
This is the setup:
- Amazon EC2 c1.medium instance
- ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 59480
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 999999
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 59480
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
- apollo.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<broker xmlns="http://activemq.apache.org/schema/activemq/apollo";>
<log_category console="console" security="security"
connection="connection" audit="audit"/>
<authentication domain="apollo"/>
<access_rule allow="admins" action="*"/>
<access_rule allow="*" action="connect" kind="connector"/>
<virtual_host id="testBroker">
<host_name>testBroker</host_name>
<host_name>localhost</host_name>
<host_name>127.0.0.1</host_name>
<host_name>****************.compute.amazonaws.com</host_name>
<authentication enabled="false"/>
<access_rule allow="users" action="connect create destroy send receive
consume"/>
</virtual_host>
<web_admin bind="http://****************.compute.amazonaws.com:61680"/>
<connector id="mqtt" protocol="mqtt" bind="tcp://0.0.0.0:1883"/>
</broker>
I didn't find any documentation about the usage of MQTT in Apollo, so this
configuration might make no sense at all. Any advice or pointers to more
information?
Thanks,
Frank
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