Performance-limiting characteristics of Nodes
felix.bembrick at gmail.com
Sun Dec 29 16:27:41 PST 2013
But the impact on performance that arises simply by increasing the number of nodes is not limited to low powered devices like the Pi. I am interested to know what the cause of that effect is.
> On 30 Dec 2013, at 11:03, Herv¨¦ Girod <herve.girod at gmail.com> wrote:
> I did not look at the presentation, but perhaps the Raspberry Pi itself is one if the key reasons for these performance problems. It is a great but limited device. I'm not taking at face value the claim that the Pi beats last year generation smartphones architecture.
> And I'm not sure that canvas would be a suitable tool for "complex" graphic work in JavaFX. It is very limited, I think intentionally. For example you end having a lot of "work" to do even if you want to make a small change to an existing "scene". Nodes are much more powerful.
> Sent from my iPhone
>> On 30 d¨¦c. 2013, at 00:15, Felix Bembrick <felix.bembrick at gmail.com> wrote:
>> I just watched the excellent presentation by Gerrit Grunwald "Use the force
>> Luke" on Parleys and in it he mentions that one of the key ways to improve
>> performance is to limit the number of nodes in the scenegraph. He also
>> mentions that on such devices as the Raspberry Pi the maximum number of
>> nodes viable before performance degrades significantly is very, very
>> limited. Further, he then goes on to demonstrate that the equivalent
>> visual appearance can be achieved by other means such as CSS, Canvas etc.
>> where the number of nodes is much less.
>> The implication here is that there is a performance-limiting effect of
>> Nodes. If the device's GPU is capable of rendering certain graphics
>> primitives, effects, transitions etc. and JavaFX is capable of "making them
>> happen" by one way or another, I am curious as to why the simple presence
>> of Nodes limits performance so significantly.
>> The obvious conclusion is that Nodes use memory and perhaps the associated
>> overhead is the cause but given that we are largely talking about GPU based
>> processing I find it hard to believe that it's as simple as this.
>> So what is it about the nature of Nodes that causes them to have such a
>> limiting effect on performance?
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