Hi Eric, Fop calculates layout in page sequence chunks, so try breaking up your pages into chunks of page sequences. Pages should be available for garbage collection once the page sequence has been rendered.
Cheers, Adrian. On May 18, 2011, at 7:24 AM, Michael Rubin <mru...@thunderhead.com> wrote: > Just a wild thought. But is there a way you could possibly get the JVM to > garbage collect between each run? Maybe that might free the memory up? > > Thanks. > > -Mike > > On 18/05/11 13:20, Eric Douglas wrote: > >> I am using Fop 1.0. >> I tried using Fop to transform a single document. When I got a little over >> 100 pages my FO file was over 5 MB. The transform crashed with a Java heap >> out of memory error. >> >> I managed to break the input down, as I'm using embedded code generating the >> input programmatically, and the PDF output is a lot smaller. >> >> So I'm currently transforming 10 pages at a time, setting the >> initial-page-number to the next sequence (1, 11, 21, etc). >> >> Then I save all the generated PDFs in memory and merge them using pdfbox. >> So far this is working great. >> >> I tried to do the same thing with the PNGRenderer, just calling a method to >> transform 10 pages at a time and save the output images in an array. >> >> The PNGRenderer is created locally in the method. It should be getting >> released when the method ends but the java process never releases any memory. >> >> I tested a 90 page report and the memory use was over 1 GB. I tested on >> another machine where the memory limit is apparently lower and it crashed on >> page 24. >> >> Everything about the method to render to PNG is the same as the method to >> render to PDF aside from the Renderer. >> Is there a problem with this renderer or something I could need to do >> different? >> > > > Michael Rubin > Developer > > T > F > M > E > W > +44 20 8238 7400 > +44 20 8238 7401 > > mru...@thunderhead.com > www.thunderhead.com > > Thunderhead featured in The Sunday Times Profit Track 100 league table of > companies with fastest-growing profits. Click here to read more. > > The contents of this e-mail are intended for the named addressee only. It > contains information that may be confidential. Unless you are the named > addressee or an authorized designee, you may not copy or use it, or disclose > it to anyone else. If you received it in error please notify us immediately > and then destroy it.