Hello All,
Recently I have started using Apache Batik to create PDF files from SVG
templates. The application is used to generate exam pages for students.
It works great but it uses a huge amount of memory. This is sometimes
annoying because i have to increase the memory limit to over 4Gb to have
it complete the task. There are in general lots of students (500+) and
in one case 2000+ students. This will, of course, eat memory like an
elephant I accept that.
I want to reduce this memory footprint and have found one issue in my
program where I need help with.
I am using the Java JRE 1.6.0_32, Batik 1.7 and PDFBox 1.6.0.
The program has the following flow:
1. fetch students from source (Excel file)
2. create workers to generate pdf from svg
3. while not all students have been processed do
3.1 replace information in svg document ( using w3c functions from
Document class ) (this is done by worker)
3.2 generate PDF from svg document (Using PDFTranscoder)
3.3 check if there are more students; true: goto 3.1; false:
continue with step 4
4. clean up workers
5. generate single pdf from all generated pdfs using PDFBox
6. done
It is a multi threaded environment and all the workers are in their own
thread, each worker has a copy of the svg document, they dont share
anything (for obvious reasons).
What I have found is what comes after step 4, after cleaning up the
workers I am still using 1Gb of memory which is much more than when I
start (around 128Mb). I suspect there is some caching here and there but
I have not enough knowledge from batik to fix this problem.
Who can help me or has the answer for me?
Thanks in advance,
Hilbert Mostert
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