Hi Sven,
Thanks for sharing this with us.
Do you mind to create a JIRA[1] with a simple unit test to demonstrate
improvement that you made? And we are happy to apply it into CXF
repository.
[1]https://issues.apache.org/jira/browse/CXF
On 5/17/11 1:42 AM, Sven Zethelius wrote:
We were doing some performance comparisons of the a custom DataBinding using
JAXB and noticed a very large jump in response times when combining JAXB
marshalling and GZIPFeature. Without compression, we saw 24 ms response times,
of that 3 ms were spent in our custom DataBinding that uses
javax.xml.bind.Marshaller.marshal(Object, XMLStreamWriter). With compression,
our sample messages were seeing 400 ms response times, of that most was in the
marshal call. I notice CXF is using the same call for its JAXBDataBinding, so
wanted to raise what I've found so anyone else interested can validate the same
with stock CXF.
After adding some monitoring, I found a big gain by adding a very simple fix:
The GZIPOutInterceptor needs a BufferedOutputStream wrapping the
GZIPOutputStream. I did this with a custom Interceptor that I installed,
after(GZIPOutInterceptor.class.getName()). On just the server Out, this
reduced response times from 100 ms, and out serialization to 5 ms. Need to do
some more tweaks to add it to client side as well, which should reduce that 100
ms number even further.
The reason this makes a difference, at least on Windows, is that JAXB makes
hundreds of calls to the OutputStream it is passed, in this case
GZIPOutputStream. This means hundreds of JNI calls and a lot of kernel context
switching. With the BuffferedOutputStream, those calls are reduced to a couple
dozen, on a much larger data set that makes the Deflater much more efficient.
Environment:
JAXB 2.1 (JDK 6)
CXF 2.3.2
Windows Server 2003
4 request threads
--
Willem
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