Thanks. I have many threads come and go instead of a fixed pool so the
overhead is big.
I hope rhino to have a mode that would allow a preloaded/compiled JS
(template) to be executed repeatedly
with different scope (essentially a template engine ) to produce an
output string.
the template would run in only single thread before producing the output.
Equivalent of Freemarker engine. Would it be possible? Or because of
this issue,
Rhino has not been widely used as template engine for Java, compared to
others like
velocity/freemarker.
Thanks
David Parks wrote:
How many worker threads do you have? Context.enter() isn't an expensive
operation assuming you have the context set up already for each thread. I've
executed upwards of 10,000 Context.enter/exit() operations a second
(including executing a small amount of JS and resuming+suspending the JS
execution) on a single processor (numbers are off the top of my head it was
a while ago that I profiled it, but in any case it was a large number). If
it's really a big problem for you (perhaps your threads are being destroyed
rather than recycled??), you might consider setting up a smaller Work Queue
(an executor service) of threads that process javascript and submitting
requests to process javascript to that smaller set of threads.
If this is a conceptual concern I suggest profiling the scenario to find out
what really happens in your situation.
Dave
-----Original Message-----
From:
dev-tech-js-engine-rhino-bounces+davidparks21=yahoo....@lists.mozilla.org
[mailto:dev-tech-js-engine-rhino-bounces+davidparks21=yahoo....@lists.mozill
a.org] On Behalf Of DVD
Sent: Sunday, August 30, 2009 12:51 AM
To: [email protected]
Subject: Use Rhino in HTTPServlet, poor performance
Hello:
I intend to use Rhino in my HTTPServlet methods to execute a javascript
everytime user request a url. But according to doc, for every method call,
I have to first use Context.enter()/Scrope/ before eval the same static
script
again and again. This is to meet the requirement that Context must be
created
for each thread and due to servlet model, this incurs huge overhead for
performance,
particularly when many users hits the url at the same time. Is there a way
to have a precompiled form of the Javascript file created only once and
used
for multple thread? The script file itself can be assumed static and no
need for
implementing dynamic reload, which would make it easier.
Thanks very much
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