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https://issues.apache.org/jira/browse/PDFBOX-4739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014013#comment-17014013
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Tilman Hausherr commented on PDFBOX-4739:
-----------------------------------------
The statistic means nothing as it is now, because the GC won't run if there is
enough memory left. Crashing is more interesting. It would be useful to have
this in a reproducible way.
> Memory issues when rendering pdf to image
> -----------------------------------------
>
> Key: PDFBOX-4739
> URL: https://issues.apache.org/jira/browse/PDFBOX-4739
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.18
> Reporter: Lior Yaffe
> Priority: Blocker
> Attachments: linkedinceoresume.pdf
>
>
> So I'm trying to write a web service which performs OCR on an input pdf files.
> The code is very simple - convert the pdf to tiff files using PDFBox, and
> then use tesseract on the tiff files to get text.
> code is very straight forward:
>
> {code:java}
> private List<ByteArrayOutputStream> convertPdfToTiff2() throws IOException {
> List<ByteArrayOutputStream> fileList = new ArrayList<>();
> PDDocument doc = PDDocument.load(this.bytes);
> doc.setResourceCache(new EmptyCache());
> try {
> PDFRenderer pdfRenderer = new PDFRenderer(doc);
> for (int page = 0; page < doc.getNumberOfPages(); ++page) {
> BufferedImage bufferedImage =
> pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
> calcImageSize(bufferedImage);
> ByteArrayOutputStream os = new ByteArrayOutputStream();
> ImageIO.write(bufferedImage, "tiff", os);
> os.flush();
> os.close();
> bufferedImage.flush();
> bufferedImage = null;
> fileList.add(os);
> }
> } finally {
> doc.close();
> }
> return fileList;
> }
> {code}
>
> I'm trying to run a sample test which runs this concurrent with 5-6 different
> threads, but the app is crashing very fast.
>
> I did some memory tests, and it seems that while the input file is around 70
> kb, the
> {code:java}
> pdfRenderer
> {code}
> object is around 300 MB!! no matter if i'm changing the DPI level, the object
> is still very large.
> in addition, only if I'm calling the GC I see the memory drops, even if I'm
> closing the doc object....
>
> Basically when I'm running my server with -Xmx6GB with 6 threads in
> concurrent, after 3 runs the service is crashing....what am I missing here?
>
> * I attached the input pdf file
>
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