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https://issues.apache.org/jira/browse/PDFBOX-4649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16927909#comment-16927909
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Tilman Hausherr commented on PDFBOX-4649:
-----------------------------------------
With PDFDebugger I can display these files at 72dpi in 5 seconds with -Xmx4g.
If I set the CPU to "ridiculous speed" more, it goes down to 2 seconds.
Additional time will be needed to save the files.
It will be slower with higher dpi. It went up to about 3 seconds at 400% which
is about 288dpi.
You can increase speed slightly by changing
{code}
PDDocument.load(Files.newInputStream(filePath, StandardOpenOption.READ))
{code}
to
{code}
PDDocument.load(new File(filePath))
{code}
> High CPU load an memory usage, when converting PDF to Image
> -----------------------------------------------------------
>
> Key: PDFBOX-4649
> URL: https://issues.apache.org/jira/browse/PDFBOX-4649
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.16
> Reporter: Willie Chieukam
> Priority: Critical
> Attachments: 331577-5_b_19ez1.pdf, 332699-5_c_19ez7.pdf,
> 335520-5_c_19ezb.pdf, 335521-5_c_19ezd.pdf
>
>
> Hello!
> we are running a business web application, that is using pdfbox to convert
> pdf-files to images using using pdfRenderer.renderImageWithDPI(parameters).
> When we try to convert the attached pdf, the CPU load of tomcat, running in a
> docker container on openshift, is raising and it seems, that the process
> hangs. The tomcat process is no more responsive and we get an memory
> overflow. Also the server load is very high meanwhile.
> We are using
> + org.apache.pdfbox:pdfbox v 2.0.16
> + org.apache.pdfbox:pdfbox-tools v 2.0.16
> + org.apache.pdfbox:jbig2-imageio:3.0.2
> Our Code looks like this:
> {code:java}
> public void saveImageFromPDF(Path filePath, Path imagePath, Integer
> IMAGE_DPI, Float IMAGE_QUALITY) {
> try (PDDocument pddocument =
> PDDocument.load(Files.newInputStream(filePath, StandardOpenOption.READ))) {
> PDFRenderer pdfRenderer = new PDFRenderer(pddocument);
> for (Integer i = 0; i < pddocument.getNumberOfPages(); i++) {
> try (OutputStream outputStream = documentServiceUtility
>
> .getFileOutputStream(imagePath.resolve(Integer.toString(i) + "." +
> IMAGE_FILE_EXTENSION))) {
> BufferedImage bufferedImage =
> pdfRenderer.renderImageWithDPI(i, IMAGE_DPI, ImageType.BINARY);
> ImageIOUtil.writeImage(bufferedImage,
> IMAGE_FILE_EXTENSION, outputStream, IMAGE_DPI, IMAGE_QUALITY);
> LOG.debug("Image of document {} successfully saved.",
> imagePath.resolve(Integer.toString(i) + "." +
> IMAGE_FILE_EXTENSION));
> } catch (Throwable ex) {
> throw new NiehoffPDDocumentHanderException(filePath, ex);
> }
> }
> } catch (Exception e) {
> throw new NiehoffPDDocumentHanderException(filePath, e);
> }
> }
> {code}
> Line throwing the exception
> *{color:#FF0000}BufferedImage bufferedImage =
> pdfRenderer.renderImageWithDPI(i, IMAGE_DPI, ImageType.BINARY);{color}*
>
> Do you have an idea, how to prevent this?
> Thank you very much and best regards,
> Willie
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