Begin forwarded message:
Hi people,
From: Jeremias Maerki <[EMAIL PROTECTED]>
Interesting: a simple FO wrapper around a big preformatted text file.
<snip />
Still, it's a little scary when 0.20.5 processes this file in one
second
while 0.93 allocates 500MB+ memory for a 250KB file and eventually
dies
the OutOfMemory death. It's a very special example you have here.
Note that, even when you trim it down to only the first page-
sequence, 512MB of heap is not enough for 0.93/Trunk
Since I was a bit intrigued by this example, I did a quick debug
session to try to establish the location of the drain.
Started off by placing a sole breakpoint in
PageSequenceLayoutManager.activateLayout(), and it seems 0.93 has no
problem constructing the FO tree... as I expected, since the
structure is very simple.
There are four FOText instances per page-sequence, as the text-blocks
get split up into chunks of Short.MAX_VALUE characters at most (~ (3
x 32K) + 29K). The reason being that the TextLM uses shorts as
indices for the AreaInfos, and thus can't handle larger text-blocks.
This corresponds to four Paragraphs in the LineLayoutManager. The
initial element list construction for the Paragraphs isn't a problem
either. It is only when going further, createLineBreaks()-
>findOptimalBreakingPoints(), that the trouble starts...
In this case, it seems to be a logical consequence of the total-fit
line-breaking algorithm. Peculiar example because here total-fit on
block-level means the same as total-fit on page-sequence-level.
So, I also tried manually inserting fo:blocks around each scene in
the example, but then bumped into an Exception:
Feb 28, 2007 11:33:55 PM
org.apache.fop.fo.pagination.PageSequenceMaster getNextSimplePageMaster
WARNING: subsequences exhausted in page-sequence-master 'chapter',
using previous subsequence
Feb 28, 2007 11:33:55 PM org.apache.fop.cli.Main startFOP
SEVERE: Exception
java.lang.IllegalStateException: subsequences exhausted in page-
sequence-master 'chapter', cannot recover
at org.apache.fop.cli.InputHandler.transformTo
(InputHandler.java:168)
at org.apache.fop.cli.InputHandler.renderTo
(InputHandler.java:115)
at org.apache.fop.cli.Main.startFOP(Main.java:166)
at org.apache.fop.cli.Main.main(Main.java:197)
The investigation continues...
Cheers,
Andreas
