[
https://issues.apache.org/activemq/browse/AMQCPP-93?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_39242
]
Albert Strasheim commented on AMQCPP-93:
----------------------------------------
I've done some profiling of a benchmark that simulates part of our application
using Intel VTune (great tool, and free for non-commerial use on Linux).
We're mostly doing quite a few writeLongs and writeInts on a BytesMessage. The
data ends up in the 1 KB to 2 KB range. Then we send the messages to a topic.
For the benchmark I profiled, we didn't have any consumers, so the broker
probably just discards the message. Throughout the test runs, the broker was
never very busy.
When using Stomp, the top functions were:
ByteArrayOutputStream::write(unsigned char) 26.23%
DataOutputStream::write(unsigned char) 20.32%
[our function that does some mangling of the data before it is written to the
message] 11.93%
[everything else] 41.61%
With Openwire the picture was more or less the same:
ByteArrayOutputStream::write(unsigned char) 22.27%
DataOutputStream::write(unsigned char) 17.33%
ByteArrayOutputStream::write(unsigned char*, size_t) 15.65%
[our function that does some mangling of the data before it is written to the
message] 9.82%
[everything else] 34.93%
We see that Stomp is quite a bit faster than Openwire. It's interesting to note
that Openwire calls two different write functions on ByteArrayOutputStream and
that both eat up quite a substantial amount of the time (37.92% for both in
Openwire vs 26.23% for the single function in Stomp).
A few times we some strange long pauses (up to 500 ms) between sends. This
might be due to some Delayed ACK/Nagle's algorithm issue, as is described here:
http://www.stuartcheshire.org/papers/NagleDelayedAck/
In conclusion, it looks ByteArrayOutputStream and DataOutputStream might be
good candidates to attempt to optimize (at least for this application).
I'm working on removing our application-specific code from this benchmark. I'll
attach the code here when I'm done.
> Performance analysis
> --------------------
>
> Key: AMQCPP-93
> URL: https://issues.apache.org/activemq/browse/AMQCPP-93
> Project: ActiveMQ C++ Client
> Issue Type: Task
> Affects Versions: 2.0
> Reporter: Nathan Mittler
> Assignee: Nathan Mittler
> Fix For: 2.2
>
>
> Do a performance analysis on openwire vs stomp.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
