Make sure you're using -hotspot. Try setting the initial and max heap
size to 256M if you have it. Turn on verbose garbage collection to see
what's happening. Even though it says 'No garbage collection was
performed, I'm not sure that's accurate (see below). Also sometimes the
total memory used is negative. So don't assume you'll always run out of
memory. That said 15MB XML to 120MB PDF may be a littl much. The only
way to find out is to try it!

<<< my output on Weblogic with -hotspot -verbose:gc -ms256m -mx256m >>>

FopServlet says hi
[GC 14710K->12798K(261888K), 0.0258153 secs]
[GC 14840K->13743K(261888K), 0.0275211 secs]
[Full GC 15436K->13778K(261888K), 0.7851467 secs]
[GC 15825K->14079K(261888K), 0.0097378 secs]
[GC 16127K->14306K(261888K), 0.0203590 secs]
[GC 16354K->14835K(261888K), 0.0211491 secs]
[GC 16883K->14911K(261888K), 0.0125452 secs]
[GC 16959K->14949K(261888K), 0.0097037 secs]
[GC 16997K->14981K(261888K), 0.0080228 secs]
building formatting object tree
setting up fonts
[GC 17029K->15288K(261888K), 0.0154997 secs]
[GC 17336K->15777K(261888K), 0.0254016 secs]
[GC 17825K->16324K(261888K), 0.0199059 secs]
 [1[GC 18372K->16920K(261888K), 0.0248386 secs]
[GC 18968K->17332K(261888K), 0.0178556 secs]
[GC 19380K->17702K(261888K), 0.0221106 secs]
] [2][GC 19750K->18117K(261888K), 0.0219930 secs]
[GC 19021K->18525K(261888K), 0.0153204 secs]
[GC 19952K->19940K(261888K), 0.0163652 secs]
[GC 21009K->21005K(261888K), 0.0129846 secs]
[GC 22075K->22075K(261888K), 0.0132101 secs]
 [3[GC 24122K->23293K(261888K), 0.0148726 secs]
][GC 25341K->23623K(261888K), 0.0144110 secs]
 [4[GC 25671K->23925K(261888K), 0.0167574 secs]
[GC 25973K->24281K(261888K), 0.0171810 secs]
]
Parsing of document complete, stopping renderer
Initial heap size: 15357Kb
Current heap size: 24716Kb
Total memory used: 9358Kb
  Memory use is indicative; no GC was performed
  These figures should not be used comparatively
Total time used: 5117ms
Pages rendererd: 4
Avg render time: 1279ms/page






"Maring, Steve" wrote:
> 
> I'm using fop-0.20.1.
> 
> I started with a 650KB XML file that I transformed into a 4MB XSL:FO file.
> Running this file through FOP to generate a PDF used about 90MB of memory.
> 
> Initial heap size: 807Kb
> Current heap size: 91637Kb
> Total memory used: 90829Kb
>   Memory use is indicative; no GC was performed
>   These figures should not be used comparatively
> Total time used: 31265ms
> Pages rendererd: 17
> Avg render time: 1839ms/page
> 
> I have XML files in excess of 15MB that need to be converted to PDF.
> Assuming that a linear extrapolation is possible, it would suggest that the
> JVM running the FOP process would need in excess of 2GB of memory for this
> to avoid the dreaded java.lang.OutOfMemoryError.
> 
> Are there any optimizations that can be done to FOP?
> 
> Thanks.
> -Steve Maring
> Nielsen Media Research
> 
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