Hi,
I have a Java desktop application, using embedded FOP to create PDFs from a
data XML file and an XSLT file. I wanted to see how much memory is being used,
given the point about memory usage, page numbers and page totals
(http://xmlgraphics.apache.org/fop/1.1/running.html#memory).
My PDF reports have a "page N of TOTAL" at the bottom right of each page and I
wanted to see the memory usage and compare to no page numbers and just page
numbers without totals. I also used the two variations for page number totals
(XSL 1.0 and XSL 1.1).
To work out the memory usage I computed the difference when calling
Runtime.getRuntime().freeMemory() at the start and end of the render process.
I ran each render variation 5 times from a shell script and each render kicked
off a separate JVM to avoid any caching. Regardless of whether I had page
numbers or not, and page totals or not, it seemed the result is that there is
no difference between having page numbers/totals or not. Sometimes the memory
usage was 50 MB and sometimes 200 MB.
I then used the sample code and data files from embedded FOP,
http://svn.apache.org/viewvc/xmlgraphics/fop/tags/fop-1_1/examples/embedding/.
I modified the data XML file to contain lots of entries, giving a data file
size of about 1 MB. I also modified the XLST file to include pages numbers and
then also page totals. Again, I noticed no difference in memory usage.
Given the varying values for memory usage I'm seeing, I assume my quick and
dirty method is inadequate. I expected variation, but mostly to see far less
memory usage when no page totals were used, but that's not the case.
Has anyone seen similar results? Does using page totals really use THAT much
more memory compared to not using page totals?
Thanks in advance,Bernard.