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From John Hewson <j...@jahewson.com>
Subject Re: PDFRendering
Date Mon, 27 Jun 2016 21:34:03 GMT

> On 27 Jun 2016, at 09:54, Ankit Agarwal <ankyizhere@gmail.com> wrote:
> 
> I was getting the error even when I was rendering just 3-4 pages. So i
> don't think it was due to any memory leak.

Right, and if it was a leak then system.gc would not have fixed it. So it looks like we're
just using too much memory.

-- John

> On Mon, Jun 27, 2016 at 10:17 PM, Ankit Agarwal <ankyizhere@gmail.com>
> wrote:
> 
>> Hi, Thanks for the reply.
>> I am using  32 bit jvm and 1.5 gb of heap size.
>> Still I was getting out of memory error when i was rendering pdf with
>> multiple pages.
>> When i introduced system.gc call after each page (which is not ideal and
>> bad programming choice) , then the pages were being rendered without an
>> error.
>> So I think that the bufferedImage from previous page wasn't being cleared
>> and the next page was loaded( but in my code the image object is flushed
>> before another use so this shouldn't happen).Anyways system.gc() solved
>> this for now.
>> But as we know we cannot be sure that system.gc() will call the garbage
>> colelctor as the final decision lies with the jvm. So I guess, I'll just
>> have to try my luck here and continue with the code.
>> Thanks
>> 
>> On Mon, Jun 27, 2016 at 9:17 PM, Tilman Hausherr <THausherr@t-online.de>
>> wrote:
>> 
>>>> Am 27.06.2016 um 15:39 schrieb John Hewson:
>>>> 
>>>>> On 24 Jun 2016, at 00:55, Ankit Agarwal <ankyizhere@gmail.com>
wrote:
>>>>> 
>>>>> Hi,
>>>>> When i try to covert pdf to image then for some pdfs i get a "out of
>>>>> memory" error. So i increased heap size and then i again got the error
>>>>> for
>>>>> some different pdf file.
>>>>> for the time being assume I have no memory leak from other objects. So
>>>>> what
>>>>> would be the reason for this memory out of error?
>>>>> Would it be just that the image is so large(which is not the case i
>>>>> think)
>>>>> that it consumes heap, or maybe pdfbox stores buffered image of each
>>>>> pages
>>>>> in its memory and this contributes to the growing heap size?
>>>>> Any insight would be wonderful.
>>>> Usually it’s because the PDF contains a compressed image which is very
>>>> large
>>>> when decompressed. So the file isn’t big on disk, but it is in memory.
>>>> Try using
>>>> a 32-bit JVM as these use less memory. 1GB of heap is usually enough but
>>>> you
>>>> can go larger.
>>> 
>>> He does use 32bit JVM. I tried two of his files on a 64bit JVM and it has
>>> rendered for 24 hours with -Xmx400m.
>>> 
>>> 
>>> https://stackoverflow.com/questions/38008475/pdf-rendering-using-pdfbox/38010316#38010316
>>> 
>>> Tilman
>>> 
>>> 
>>> 
>>> 
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