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From "Lars J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FOP-2525) Memory leak present when using Truetype Collection (.ttc)
Date Tue, 05 Apr 2016 08:04:25 GMT

    [ https://issues.apache.org/jira/browse/FOP-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15225851#comment-15225851
] 

Lars J commented on FOP-2525:
-----------------------------

I'd like to second this - the patch rocks.

We have a web application that does a large amount of PDF generation, and we recently migrated
to Apache FOP and immeditely started seeing memory problems.  I've profiled our application
during PDF generation and as Andreas has reported we saw large numbers (millions!) of instances
of GlyphPositioningTable$Value and GlyphPositioningTable$PairValues accumulating in the heap
that would not be cleaned up even by a forced GC.

Applying David's patch resolved the issue - our heap usage normalised and further memory profiling
showed no more GlyphPositioningTable objects among the biggest memory consumers.

Note that we are also using TTF fonts, but not in TTC files.



> Memory leak present when using Truetype Collection (.ttc)
> ---------------------------------------------------------
>
>                 Key: FOP-2525
>                 URL: https://issues.apache.org/jira/browse/FOP-2525
>             Project: FOP
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: At least Mac and Linux, both Oracle VM and OpenJDK
>            Reporter: Jeremy Smith
>            Priority: Minor
>         Attachments: FOP-2525.patch
>
>
> When a TrueType Collection file is used to specify custom fonts, and a long-running FopFactory
is used to create FOP instances to process many FO input documents, millions of org.apache.fop.complexscripts.fonts.GlyphPositioningTable$PairValues
and org.apache.fop.complexscripts.fonts.GlyphPositioningTable$Values instances get created
which are never collected.  Thus the heap continues to grow, leading to eventual GC thrashing
or crash.
> When the same fonts are used, but extracted from the TTC file, the issue does not occur,
and the instances of those classes are collected normally.
> The issue can be seen by repeatedly processing a document with a config.xml which specifies
fonts inside of a Truetype Collection file.  Attaching VisualVM to such a process will show
continuous heap growth and millions of aforementioned instances whose numbers never decrease.



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