Instance data slow to load (at times)

> I'm running into this odd scenario where my instance definitions
> causes the page to load/display very slowly.  It doesn't happen each
> time the XForms page is loaded, but it does occur at times.  The
> source document XML is about 300kb in size.  After putting in my own
> debug statements in the Orbeon source, I found the time is being spent
> in XFormsURIResolver#resolve(String,String,String,String,String)
> method.  I've tested the the response time of my page, and even added
> debug statements to see when the request was being made.  From this, I
> was able to rule out the delaysfrom my side (average response times
> for returning of my XML documents was less than a second).  I guess
> I'm curious as to what would be causing this, and what, if anything, I
> can do to prevent these delays from happening.  I'm attaching my log
> file so that you can see the how the 1st request made to my page
> (studydef.jsf) took 399 millis, and then the 2nd request took 19271
> millis.  The XFormsURIResolver debug statements were what I was using
> to determine what was taking up the time in the
> XFormsURIResolver#readURLAsDocumentInfo method.
>
> Environment:
> Tomcat: 6.0.20
> Java: 1.6.0_20
> Orbeon: I'm using a custom build from nightly source (2010-06-25).
>
> Instance Definitions:
> <xforms:instance id="study-def" src="{$baseUrl}/{$studyDefUrl}" />
> <xforms:instance id="template-instance"
> src="{$baseUrl}/{$studyDefTemplateUrl}" />
>

> I'm doing more debugging today and I'm beginning to think that the delay is being caused within eXist somewhere, but I'm not completely positive.  Attached is another log output that contains debug statements of a single call to my JSF page that writes an XML file to the output stream.  This XML is used within the XForms XHTML as instance data (instance src="mypage.jsf").  The XML size is the same as before, ~300kb.  I've tried tweaking settings in the exist-conf.xml, setting cacheSize to 128M, nodesBuffer to 1000, and setting the lucene-index buffer to 64.  None of these changes has improved the delays.  I did notice the bump of the cacheSize made page transitions (xform to xform) faster when this odd delay situation did not occur.  But, when it does occur, it tends to cause a delay of 17-20 seconds.
>
> Has anyone else run into this kind of scenario?
>
> ------------------------------------------------------------------------
> Jeremy Nix
> Senior Application Developer
> Cincinnati Children's Hospital Medical Center
>
> On 06/29/2010 12:47 PM, Jeremy Nix wrote:
>
> I'm running into this odd scenario where my instance definitions causes the page to load/display very slowly.  It doesn't happen each time the XForms page is loaded, but it does occur at times.  The source document XML is about 300kb in size.  After putting in my own debug statements in the Orbeon source, I found the time is being spent in XFormsURIResolver#resolve(String,String,String,String,String) method.  I've tested the the response time of my page, and even added debug statements to see when the request was being made.  From this, I was able to rule out the delaysfrom my side (average response times for returning of my XML documents was less than a second).  I guess I'm curious as to what would be causing this, and what, if anything, I can do to prevent these delays from happening.  I'm attaching my log file so that you can see the how the 1st request made to my page (studydef.jsf) took 399 millis, and then the 2nd request took 19271 millis.  The XFormsURIResolver debug statements were what I was using to determine what was taking up the time in the XFormsURIResolver#readURLAsDocumentInfo method.
>
> Environment:
> Tomcat: 6.0.20
> Java: 1.6.0_20
> Orbeon: I'm using a custom build from nightly source (2010-06-25).
>
> Instance Definitions:
> <xforms:instance id="study-def" src="{$baseUrl}/{$studyDefUrl}" />
> <xforms:instance id="template-instance" src="{$baseUrl}/{$studyDefTemplateUrl}" />
>
>
>