[xep-support] Re: not enough memory to format (Java heap size)

[Gerald Wiesinger]

hello,

there is not much of a solution that i can propose. i can only share our
experience.

we are creating documents with 2000-3000 and some more pages which
primarily contain tables. these require even more memory then normal text
based documents.

we are running XEP on a WebSphere server on z/OS with 64Bit mode enabled
and the rendering process of our biggest documents takes up to 8GBs.

using the 2 step process: first create the XEP intermediate file format and
then do the final rendering did not change much. the major problem seems to
be the xep file in xml format to be stored completely in memory.
afail, future versions of websphere allow compression of objects in memory
which would save a lot, since xml files can usually be heavily deflated -
not sure if such a "virtual memory" compression is available somewhere.

we also attempted to do a splitting of the transformed fo file into
multiples and then do rendering, but this causes unwanted page breaks at
the edges of each split document and it is hard to work with continuos page
headers and footers (page numbering).
we have been able to make it work but not in a generic way. only geared to
the majority of our documents. so we dropped this and increased the memory
(in 64Bit mode) - which is quite costly on z/OS.

the same tests on a Win7 64Bit system showed the memory consumption very
similar to what is required on the server - so once your document rendering
requires more than the possible 1.2-1.4 GB on a 32Bit system then it will
be very hard to squeeze such processes in.

_________________________________________
Regards
Gerald Wiesinger

IT Architect, WW CHIS and XPrint Development
IBM Austria
Obere Donaustrasse 95, 1020 Vienna, Austria
Tel/FAX: (+43)-1-21145-6010 / 6511
e-mail:gerald_wiesinger at at.ibm.com





From:       Alexander Dyuzhev <dyuzhev at gmail.com>
To:         xep-support at renderx.com
Date:       05.05.2011 21:23
Subject:    [xep-support] not enough memory to format (Java heap size)
Sent by:    xep-support-bounces at renderx.com



I have tested old build XEPWin Version 4.18 build 20100322.
In file CliserService.exe.config I added string:
<add key="CliserService.JavaOptions" value="-Xms512M -Xmx756M" />
After that the process ended successfully.

Please note, old version have parameter name="CliserService.JavaOptions",
but last version "JAVA-OPTIONS".
May be new version CliserService don't transfer JAVA-OPTIONS to JVM ?


2011/5/5 <xep-support-request at renderx.com>


      Today's Topics:

        1. not enough memory to format (Java heap size) (Alexander Dyuzhev)


      ----------------------------------------------------------------------


      Message: 1
      Date: Thu, 5 May 2011 19:57:10 +0400
      From: Alexander Dyuzhev <dyuzhev at gmail.com>
      To: xep-support at renderx.com
      Subject: [xep-support] not enough memory to format (Java heap size)
      Message-ID: <BANLkTi=YWbQ0Enn4KRqXVFaCxgUJEwOKVw at mail.gmail.com>
      Content-Type: text/plain; charset="iso-8859-1"

      Hello!

      I have question concerning Java heap size setting for XEPWin. For
      some big
      xml documents (about 7Mb source .xml, and 20Mb .fo file, 500 pages) I
      get
      the error "not enough memory to format".
      I have edited .config file for Cliser service and set JAVA-OPTION to
      "-Xms512M -Xmx1024M", then restart Cliser service - the same error
      "not
      enough memory to format".
      After that I open Task Manager and saw that process javaw.exe is
      always
      using about only 290Mb of RAM.

      Then I tried run just XEP (not XEPWin). The process ended with error
      also.
      And memory size used by java.exe process is also about 290Mb.
      After that I run XEP with parameters -Xms512M -Xmx1024M in xep.bat
      file. The
      process ended successfully. BUT memory used by java.exe procces was
      about
      690Mb.

      What do I wrong ?
      Why -Xms -Xmx does not affected to XEPWin ?

      My computer configuration is:
      2Gb RAM, 250Gb free space on hdd, Core2Duo CPU 2.4Ghz, WinXP SP3
      32bit.

      I use last version XEPWin (april 2011) and Java VM Version 6 Update
      25.

      Thank you.

      Best regards,
      Alexander Dyuzhev



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--
С уважением,
Александр Дюжев



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