You can control how much memory the jvm uses by using the -Xmx flags. So
I think you can try that first.
The only situation where I know that FOP runs out of memory (also in a
machine with 8 GB) is when you have a very long paragraph (and I mean a
paragraph with 200K+ words). Then the line breaking algorithm has to
hold the full paragraph in memory and decide on the optimal break points
and that very likely will use all available memory. Do you know if you
have anything like that in your book? Having thousands of pages by
itself should not be an issue. It really depends on the content and on
how the line breaks happen (if you insert line breaks FOP uses a lot
less memory than if you don't).
On 10/24/12 7:49 PM, Stefan Hinz wrote:
I like FOP 1.1 a lot: Unlike previous versions, it tells you which
page it's processing, which can make debugging easier, and also it
gives you that warm fuzzy feeling that you're somewhat in control of
things. :-)
However, with really big books, I'm hitting a wall, like this:
Okt 24, 2012 8:21:16 PM org.apache.fop.events.LoggingEventListener
processEvent
INFO: Rendered page #2630.
Exception in thread "main" java.lang.OutOfMemoryError: GC overhead
limit exceeded
That is, FOP stops at about 2600 pages with an out of memory error. On
Stackoverflow (http://preview.tinyurl.com/94qute5), there's an
indication why this happens:
"This message means that for some reason the garbage collector is
taking an excessive amount of time (by default 98% of all CPU time of
the process) and recovers very little memory in each run (by default
2% of the heap).
This effectively means that your program stops doing any progress and
is busy running only the garbage collection at all time."
Does this mean it's a FOP 1.1 bug, or would there be anything I could
do to give it/Java more memory and prevent it from failing?
The error happens on an 8 GB RAM 4-core machine. At the time FOP
ended, there was like 2 GB RAM left.
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