Hello!
I want to have some idea about a performance issue that i am having
on my application.
Basically, what the application do, is a sort of webserver, used to
parse POST xml request.
For that reason i have a NIO http ws, based on grizzly library, and
for xml handling i use dom4j
the parsing is done via
req = DocumentHelper.parseText(post).getRootElement();
The design is more or less the follow
---SELECTOR THREAD (NIO)---
---READ THREAD1---
--READ THREAD2---
(this 2 reader thread will increase the performance under heavy load)
then, there is an executor thread pool, that have a MIN and MAX
worker thread.
When a selector is readed, and is ready to be executed, it will be
passed to a "worker" thread, and the worker thread
will do the rest.
Basically all the parsing logic is on worker threads, the rest is
just NIO stuff and HTTP protocol stuff, to worker thread, there is a
REQUEST and RESPONSE
object, ready for use.
While profiling the code, to make sure that everything is ok, i
noticed that 90% of the time is spent by
Element req = DocumentHelper.parseText(post).getRootElement();
which is actually pretty high :S
Also, seems that there is some locking around the code, because two
different WORKER thread have a lock
on req = DocumentHelper.parseText(post).getRootElement();
Can you please give to me some advice to increase the performance of
parsing?
Maybe i can create something in the workerthread to avoid locking?
When i get the Element req, processing it is blazing fast, using some
"setattribute, getattribute" or even some iteration.
The string size, is normally very very small, never more than 1k,
often less than 100 char
best regards!
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