Memory leaks on Linux with hardware renderer

Jim Graham james.graham at
Thu Aug 11 21:08:59 UTC 2016

It looks like we create a dummy drawable for the context and install it when we are done with the frame.  This appeared 
in rev bbb8d2772b37, but it looks like that revision involved removing the unnecessary RenderingContext class, so we may 
have been doing something similar via the RenderingContext class and the code was merely moved into SwapChain when the 
other class was deleted.  Further investigation would be needed, but my mercurial rev/diffing skills are pretty 
primitive.  Anyone care to dig a little on this and figure out if there is a reason for us to unset the drawable at the 
end of a frame?

In either case, if we had 2 windows open, and that will happen if there is a simple popup on a choice box or a menu item 
I think unfortunately, then we'd still have the problem so whether or not it happens with a single window with no popup 
items in it, it still looks like we could potentially trigger this in common cases anyway.  We should track the fix to 
GLX and make sure we document required patches if there is a fix...


On 8/11/16 6:13 AM, Itai wrote:
> I'm sorry to see the issue could still not be reproduced on any OpenJFX
> team members.
> Meanwhile, I have noticed a user on reddit (JavaFX sub-reddit) had the same
> issue:
> .
> However, they have managed to profile it (VisualVM has a bug making it
> nearly impossible to CPU profile JavaFX programs), and found out a lot of
> time is taken by `com.sun.prism.es2.X11GLContext.makeCurrent`.
> Taking this lead, I have found this:
> Sadly I don't know enough about OpenGL to understand most of it, but it
> seems to me like it's the same issue, so possibly it's not a Java issue at
> all. However, maybe it can be avoided? In this linked post it is mentioned
> that the leak only happens when having two windows, but in JavaFX this
> always happens, so maybe there is a redundant call to `makeCurrent`?
> Hope this helps to find the source of the problem, and if it's indeed
> outside of Java/JavaFX scope - report it to the relevant project.
> On Thu, Jul 21, 2016 at 6:12 PM, Kevin Rushforth <kevin.rushforth at
>> wrote:
>> Thanks. I added this to the bug report for
>> browse/JDK-8161911
>> -- Kevin
>> Rahman USTA wrote:
>> Hello Kevin;
>> One of our user reported "Must be a memory leak somewhere" in AsciidocFX
>> project. It seems a similar issue.
>> You can see the issue here
>> asciidocfx/AsciidocFX/issues/227
>> Thanks.
>> 2016-07-21 2:38 GMT+03:00 Kevin Rushforth <kevin.rushforth at>:
>>> I'll add a comment to that effect (although our incident triage team is
>>> good about spotting such duplicates).
>>> -- Kevin
>>> Itai wrote:
>>>> Thank you. Having gotten no reply, and seeing the bug report was closed
>>>> and with not means of commenting in the bug report system, I have since
>>>> (about an hour ago) filed a more detailed report (JI-9042009). I believe
>>>> they could be safely merged, but the second one does contain some more
>>>> info.
>>>> On Thu, Jul 21, 2016 at 2:27 AM, Kevin Rushforth <
>>>> kevin.rushforth at <mailto:kevin.rushforth at>> wrote:
>>>>     JI-9041860 has now been transferred to the JDK project as:
>>>>     Our support engineer was not able to reproduce the problem, so
>>>>     closed it as such. Based on the additional information you
>>>>     provided, I have reopened the bug and will ask someone on our team
>>>>     with a physical Linux setup to try to reproduce it.
>>>>     To answer your question, we are not aware of any such leaks.
>>>>     -- Kevin
>>>>     Itai wrote:
>>>>         I'm experiencing multiple memory leaks with JavaFX on Linux,
>>>>         to the point
>>>>         where I'm not sure which bug to report, as it seems like a
>>>>         systematic
>>>>         issue.
>>>>         The memory leak seems to be completely absent when using the
>>>>         software
>>>>         renderer (-Dprism.order=sw), and does not seem to happen on
>>>>         Windows
>>>>         (presumably not on Mac either, although I have no Mac to test
>>>> it).
>>>>         Test cases include:
>>>>         1. Use ProgressIndicator with progress set to Indeterminate -
>>>>         with default
>>>>         (HW) renderer memory consumption quickly rises, climbing to
>>>>         8GB and more if
>>>>         not killed. With software renderer memory usage is reasonable.
>>>>         2. Using Scene Builder - after a few minutes with Scene
>>>>         Builder it quickly
>>>>         gobbles up all system memory - again, problem seems to go away
>>>>         if using
>>>>         software renderer. This test is less repeatable, as some
>>>>         actions seem more
>>>>         detrimental than others.
>>>>         3. Using Transitions on nodes (See attached code "".
>>>>         I have filed
>>>>         a bug report about this issue, JI-9041860). Running with
>>>>         default renderer
>>>>         the simple program reaches 3GB within 30 seconds, and memory
>>>>         continues to
>>>>         climb. On software renderer memory consumption remains <100MB
>>>>         for a minute
>>>>         and more.
>>>>         As I said, I am no longer sure it is prudent to report
>>>>         specific bugs, as
>>>>         this seems to be some low-level problem. I just want to know
>>>>         if this is a
>>>>         known issue and if there is any way to get around it (besides
>>>>         using the
>>>>         software pipe, which obviously has it's own disadvantages).
>>>>         For reference, I'm using Debian (testing, updated today),
>>>>         kernel version
>>>>         4.6.2, Intel HD4000 GPU, Intel driver version 2.99.917 (kms
>>>>         driver),
>>>>         OpenJDK version 1.8.0_91-8u91-b14-3-b14 (behavior is identical
>>>>         on Oracle
>>>>         version).
>>>>         If there is any other information needed please let me know.
>>>>         If this is a
>>>>         known issue I apologize, but I have tried searching and didn't
>>>>         find any
>>>>         reports of such behavior.
>>>>         Thank you.
>> --
>> Rahman USTA
>> Istanbul JUG
>> <>

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