Re: [iText-questions] Memory usage

Sam Green Mon, 11 Dec 2006 06:26:45 -0800

Hi Paulo,

My problem becomes alot trickier to solve when I take into account thefact that I have several nested tables. The simple case of having onetable in the pdf is easy, and I can quite happily split this amountseveral tables and add page breaks directory to the document object.

However, if for example I say that I have a single table with twocolumns. In the first column is a table of indeterminate length. Inthe second column is another table with one columns and two cells, thefirst cell containing an image and the second containing another tableof indeterminate length. (see attached gif)Both of the large tables have large amounts of data in, so according towhat I have learned so far, I will have to manually place the data anddetermine myself the amount of rows I can fit on the page.

Suddenly the process is alot more difficult, because I have to keeptrack of the contents of all the tables in the hierarchy, and recreatethe table structure on the next page continuing all tables where theyleft off.

Is this just something that I will have to work out how to doprogrammatically? Or is there anything in this API that can help me out?


Has anyone come across this kind of problem before?


Thanks,
Sam.

Paulo Soares wrote:

You can use direct content and high level objects. In this case you justneed to break the table in several smaller tables.


Paulo

----- Original Message -----From: "Sam Green" <[EMAIL PROTECTED]>To: "Post all your questions about iText here"<itext-questions@lists.sourceforge.net>

Sent: Monday, December 11, 2006 1:43 PM
Subject: Re: [iText-questions] Memory usage

Thank Paulo,

It seems strange to me that the massive leap in memory usage occurs when
the PdfPTable is added to the document, rather than when the large
complex PdfPTable is created.   But I guess it's feasible that writing
to the PDF document requires an extra proportional amount of memory

resources to the size of the object being written. Would that becorrect?


Looks as though I'm going to have to start delving into the direct
content more and more! *gulp*

Thanks again,
Sam.



Paulo Soares wrote:

See
http://itextdocs.lowagie.com/tutorial/objects/tables/pdfptable/index.html#memory

Paulo

----- Original Message -----From: "Sam Green" <[EMAIL PROTECTED]>

To: "iText Mailing List" <itext-questions@lists.sourceforge.net>
Sent: Monday, December 11, 2006 1:05 PM
Subject: [iText-questions] Memory usage

Hi there,

I'm having some issues with the amount of memory PDF generation is
using, and I'd just like to run it past you to see if you have any ideas
as to the best way to tackle it!

I'm running this as part of a tomcat application.

I'm using the following code to open up the file and write the data:

Document document = new Document();
PdfWriter writer = PdfWriter.getInstance( document, new
FileOutputStream( temporaryFileName ));
document.open();
// Add a title page first.
..
// Add main pages.
PdfPTable table = getPDFRendering();
document.add( table );
document.close();


getPDFRendering()  is generating a few nested PdfPTables with the
occassionally text Chunk,   with a large PdfPTable at its core.
This data table contains 500-1000 rows of ~30 columns (each cell
containing, typically, an integer).  I am also using an extra empty cell
between each cell for spacing (I am reusing my 'blank cell' object for
each of these empty cells).

while watching 'top' when the 'document.add' line gets executed, the
memory usage of tomcat increases by ~500mb.

There are a few points I thought of:
- That's alot of data.  However, I'd like to find ways of being able to
generate the PDF while trying to control the memory usage.
- Extra empty cell for spacing might be a bit retarded,  is there some
'cell padding'  i can add to the PdfPTable?
- Is there something odd adding to the overhead? E.g. having a large
table inside a bunch of nested tables?
- Would it be better on memory to, instead of creating the table and
then adding it to the document, pass the document into the method that
generates the main table and do the following:

document.add( table );
...
for( int i=0; i<rows; i++ ) {
   for( int j=0; j<cells_in_row; j++ ) {
       table.addCell( blah );
   }
}
...

Would any of these ideas help substantially?  Is there anything else I
can try?


Thanks for your help,
Sam.


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Sam Green
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London EC2R 8AB

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Flextrade UK
(44) 0207 796 3001
8 Fredericks Place
London EC2R 8AB

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Re: [iText-questions] Memory usage

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