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From John Austin <>
Subject Re: FOP debug message meaning
Date Wed, 10 Apr 2002 02:20:24 GMT
On Tuesday 09 April 2002 15:04, you wrote:
> When running FOP without turning off the debug information written to
> the standard out, text such as this is printed when FOP finishes
> rendering a PDF page:
> Parsing of document complete, stopping renderer
> Initial heap size: 111343Kb
> Current heap size: 107377Kb
> Total memory used: -3966Kb
>   Memory use is indicative; no GC was performed
>   These figures should not be used comparatively
> Total time used: 5562ms
> Pages rendererd: 10
> Avg render time: 556ms/page
> Most of the info, like total time, average time, etc is
> self-explanatory. But could somebody please explain the meanings of
> the heap and memory size lines?

.. snip ..

Are you asking what a heap is ? or just what the values relate to ?

I use Fop from Cocoon and for my 600k input file C2 uses up over 300Mb 
some times. When I run the same XSL style sheets from a simple (perl) 
driver script, memory usage does not exceed 50Mb.

My C2 machine is a Mandrake 8.0 K6-2 500MHz with 512Mb real memory.
When I was running Cocoon 2.0 with only 256Mb the box died on older 
versions of the stylesheets. I will move to servlets from C2 only if 
this does not get better. 

Anyone else feel that

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