Potential problem with glMapBuffer

> I've recently recognized that my JOGL programs slow down significantly over
> time. After analyzing my code I found that calls to glMapBuffer seem to be the
> source of the slow down.
>
> I've prepared a minimalistic test case. It basically sets up a VBO with space
> for 3 float values. In the display method I do nothing else than mapping the
> VBO and writing 3 float values to it; no actual rendering takes place. I do
> this 100 times per frame to make the slow down noticeable more quickly.
>
> When you run the test case you will see that the rendering time per frame
> increases significantly within less than a minute. If tested on Windows 7
> (64bit), Ubuntu 13.04 (64bit) with both NVIDIA and AMD cards.
>
> A work-around to the problem is to NOT use glMapBuffer, and instead use
> glBufferData to create a new buffer with the new data.
>
> I'd appreciate if the JOGL maintainers could look into this and advise me if
> I'm doing something wrong or maybe fix the problem if it's on the JOGL side.
>
> Thanks a lot!
>
> GlMapBufferTest.java <http://forum.jogamp.org/file/n4029376/GlMapBufferTest.java>