Just to check are your precompiling the jsp page?
On 5/28/05, Kevin Burton <[EMAIL PROTECTED]> wrote:
> I've been tuning our application trying to get the maximum performance
> out if the system as possible.
>
> I've been throwing the system at jprofiler and allowing it to tell me
> where to optimized.
>
> In short Tomcat is slower than our DB, filesystem,. network and all
> other systems by about 4x.
>
> I've been able to shave some page load time off by some but not enough.
>
> The problem I'm starting to see is that we just have a large number of
> c:set and c:if constructs (and so forth) within loops. These loops then
> get executed 5 times and next thing you know it you have 50k taglib calls.
>
> The problem comes when you look at the source:
>
> Let's say you start with:
>
> > <c:set var="foo" value="bar"/>
>
> This nice little elegant piece of code gets expanded to:
>
> > private boolean _jspx_meth_c_set_0(PageContext _jspx_page_context)
> > throws Throwable {
> > PageContext pageContext = _jspx_page_context;
> > JspWriter out = _jspx_page_context.getOut();
> > // c:set
> > org.apache.taglibs.standard.tag.rt.core.SetTag _jspx_th_c_set_0 =
> > (org.apache.taglibs.standard.tag.rt.core.SetTag)
> > _jspx_tagPool_c_set_var_value_nobody.get(org.apache.taglibs.standard.tag.rt.core.SetTag.class);
> > _jspx_th_c_set_0.setPageContext(_jspx_page_context);
> > _jspx_th_c_set_0.setParent(null);
> > _jspx_th_c_set_0.setVar("foo");
> > _jspx_th_c_set_0.setValue(new String("bar"));
> > int _jspx_eval_c_set_0 = _jspx_th_c_set_0.doStartTag();
> > if (_jspx_th_c_set_0.doEndTag() ==
> > javax.servlet.jsp.tagext.Tag.SKIP_PAGE)
> > return true;
> > _jspx_tagPool_c_set_var_value_nobody.reuse(_jspx_th_c_set_0);
> > return false;
> > }
>
> Which explains why JSP alone is so amazingly slow!
>
>
> I did a comparison of the page performance here and it was 15x slower than
> just using Java. So the same "set" operation in Java was 15x faster.
>
> ... so in short ... does anyone have any way to speed this up?
>
> The other thing I noticed is that EL is evaluated at runtime (which has to be
> parsed) and sometimes uses reflections. Can anyone shed any more light on
> this and hopefully provide some performance optimization suggestions?
>
> Kevin
>
> --
>
>
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>
> Kevin A. Burton, Location - San Francisco, CA
> AIM/YIM - sfburtonator, Web - http://peerfear.org/
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>
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