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I also agree with John here. Especially regarding the lookup, we should definitely use a hash based algorithm (HashMap?) with a reasonable default size. hashCode really is not expensive, but we should recheck. @Andy, when you did the changes</div>
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<html><body><div style="font-family: 'verdana'; font-size: 12px; color: #000;"><span style="background-color: #ffffff;">I also agree with John here. Especially regarding the lookup, we should definitely use a hash based algorithm (HashMap?) with a reasonable default size.</span></div>
<div style="font-family: 'verdana'; font-size: 12px; color: #000;"><span style="background-color: #ffffff;">hashCode really is not expensive, but we should recheck. </span></div>
<div style="font-family: 'verdana'; font-size: 12px; color: #000;"><span style="background-color: #ffffff;"> </span></div>
<div style="font-family: 'verdana'; font-size: 12px; color: #000;"><span style="background-color: #ffffff;">@Andy, when you did the changes / rechecked, I would be happy to test it with some applications.<br>I usually set the compact object headers in those applications as well, so we will see how much we gain then. If there is something I should use or do (VisualVM?), just tell me to do so. I'm interested as well about the gains.</span></div>
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<div style="font-family: 'verdana'; font-size: 12px; color: #000;"><span style="background-color: #ffffff;">Marius</span></div>
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<div><strong>Gesendet: </strong>Dienstag, 24. Februar 2026 um 08:05</div>
<div><strong>Von: </strong>"John Hendrikx" <john.hendrikx@gmail.com></div>
<div><strong>An: </strong>"Andy Goryachev" <andy.goryachev@oracle.com>, "openjfx-dev@openjdk.org" <openjfx-dev@openjdk.org></div>
<div><strong>Betreff: </strong>[External] : Re: Experiment: Node properties</div>
</div>
<div style="display: none; visibility: hidden; font-size: 1.0px; color: #ffffff; line-height: 1.0px; max-height: 0.0px; overflow: hidden;">Thanks for the taking the time to respond. On 24/02/2026 00: 32, Andy Goryachev wrote: > What trade off are you making here? It seems we're trading a small memory gain for more CPU use (extra indirection, walking a list linearly to find the</div>
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<p>Thanks for the taking the time to respond.</p>
<div class="moz-cite-prefix">On 24/02/2026 00:32, Andy Goryachev wrote:</div>
<blockquote>
<p style="direction: ltr; margin-top: 0.0px; margin-bottom: 0.0px;"><span style="font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">> What trade off are you making here? It seems we're trading a small memory gain for more CPU use (extra indirection, walking a list linearly to find the correct property on each use/access VS no indirection, no list walking).</span></p>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">You are right. The tradeoff is non-zero memory gain (a few megabytes, to the tune of maybe 5% of total heap size) at the cost of extra CPU cycles. The rationale is that even though we consume extra CPU, it's much less noticeable because of the cache-friendly implementation and non-zero positive impact on garbage collector (less memory to scan).</div>
</blockquote>
<p>What is more cache friendly about adding several extra indirections to get to a property's value? Let me see:</p>
<p>Before:</p>
<p>- isFocusTraversable(): get property -> get value</p>
<p>After:</p>
<p>- isFocusTraversable(): get fast map -> get key ArrayList -> get internal array -> get value ArrayList -> get internal array -> get property -> get value</p>
<p>For the garbage collector, the properties are likely going to be in an area of the GC collector that will be scanned rarely, and not part of the frequent scans for young objects. I don't think we can generally conclude that having less memory used will have an overall positive impact on the GC here. The properties will be seen as long-lived by the GC, and will reside in an area only scanned rarely, which has very little impact on the performance of most GC implementations. </p>
<blockquote>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<p style="direction: ltr; margin-top: 0.0px; margin-bottom: 0.0px;"><span style="font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">> Are the resource constrained platforms you named generally memory or CPU constrained?</span></p>
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<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">I asked Gluon for some feedback on iOS/Android. However, my previous experience with a large trading application says that memory footprint savings outweighs the CPU cycles, so I would imagine we'll get a net gain even on the desktop.</div>
</blockquote>
<p>That's anecdotal, and will depend on the type of application, platform, CPU cores available, etc. So while you may be correct for your trading application, it may be completely the opposite for a task tracking application. In general, memory use is hardly a factor for most applications; most Java apps don't even bother to limit the heap, yet complain about several GB's of memory use when they have a retained size of less than half a GB. Not that I'm not in favor of reducing memory footprint, but I seriously wonder if there is much to gain at the property level.</p>
<p> </p>
<blockquote>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<p style="direction: ltr; margin-top: 0.0px; margin-bottom: 0.0px;"><span style="font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">> Have you investigated a breakdown of JavaFX memory use, and did the amount of memory used by properties come out on top here?</span></p>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">There is some statistics provided in <a class="moz-txt-link-freetext" href="https://github.com/andy-goryachev-oracle/Test/blob/main/doc/Experiments/NodeProperties.md" target="_blank" rel="noopener noreferrer"> https://github.com/andy-goryachev-oracle/Test/blob/main/doc/Experiments/NodeProperties.md</a> , please take a look.</div>
</blockquote>
I took a look, but could only find statistics about properties. I didn't see a breakdown of general JavaFX memory use (the other 95%) to see if properties are the lowest hanging fruit.<br>
<blockquote>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<p style="direction: ltr; margin-top: 0.0px; margin-bottom: 0.0px;"><span style="font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">> Would the gains you made here become irrelevant or less relevant with Compact Object Headers [<a class="moz-txt-link-freetext" style="margin-top: 0.0px; margin-bottom: 0.0px;" href="https://openjdk.org/jeps/519" target="_blank" rel="noopener noreferrer">https://openjdk.org/jeps/519</a>]</span></p>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">Compact Object Headers are almost irrelevant here - the stats that were collected count the number of pointers saved (assumed 8 bytes per pointer on 64 bit). The stats ignore any other possible savings.</div>
</blockquote>
<p>Compact Object Headers is especially relevant here as you're optimizing small objects (properties) on which JEP519 offers the most relative gain. Enabling it may reduce the 5% memory gain you measured to a smaller margin, which impacts the rationale for this change.</p>
<p>Furthermore, if we're talking about saving memory, I think we can assume we're using small heaps (less than 32 GB). In that case, Hotspot will use 4 bytes per pointer (compressed OOPs) not 8, so your assumption of 8 bytes per pointer will be incorrect in the vast majority of JavaFX cases.</p>
<blockquote>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<p style="direction: ltr; margin-top: 0.0px; margin-bottom: 0.0px;"><span style="font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">> I think the property look-up system cannot reasonably be List (FastMap despite its name is a List). Converting this to a map however is likely to require a small object (like Map.Entry) which will further reduce any gains you made here I think.</span></p>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">The FastMap is a map-like (key-value) storage, even though it's implemented as an array. There is a debate as to what would the most efficient implementation entail (a hashmap, one array, or two arrays like the POC currently uses). The idea is not to put <strong>all</strong> the properties into the container, but only the rarely used ones, with the end result of having a few (less than 4-6, say). This makes the object small and cache-friendly, which further speeds up the access.</div>
</blockquote>
<p>I'm aware of the intentions to only put the rarely used properties there. What is rarely used will depend on the application. How many properties will end up being stored there also depends on the application. What if the app does need several of these properties and this structure grows to contain 20-30 properties?</p>
<p>Currently your proposal wants to store these rarely used properties in an O(n) structure, whereas a hash based solutions are O(1), and where doing nothing is even faster as there is no map at all.</p>
<p>So although your map implementation may be small and cache friendly (that last point being debatable, see indirection count), it degrades badly when there are more than the predicted amount of properties, and requires many more indirections than the base case of doing nothing.</p>
<p>There is talk about not having to do an expensive `hashCode` call in your proposal. First, `hashCode` is really cheap for objects not implementing equality as it falls back on the Object#hashCode. I believe this is the case for properties. Even if it isn't the case, you could use the identity hash code here (the `==` equivalent in the hashing world).</p>
<p>However that "expensive" call is what enables the O(1) lookup of the value you are interested in, which can be truly cache friendly with the right structure (array based open addressed map).</p>
<p>--John</p>
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<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">Thanks!</div>
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<div style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">-andy</div>
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<div class="ms-outlook-mobile-reference-message skipProofing" style="text-align: left; padding: 3.0pt 0.0in 0.0in; border-width: 1.0pt medium medium; border-style: solid none none; font-family: Aptos; font-size: 12.0pt; color: black;"><strong>From: </strong>openjfx-dev <a class="moz-txt-link-rfc2396E" href="mailto:openjfx-dev-retn@openjdk.org" target="_blank" rel="noopener noreferrer"><openjfx-dev-retn@openjdk.org></a> on behalf of John Hendrikx <a class="moz-txt-link-rfc2396E" href="mailto:john.hendrikx@gmail.com" target="_blank" rel="noopener noreferrer"><john.hendrikx@gmail.com></a><br><strong>Date: </strong>Thursday, February 19, 2026 at 15:28<br><strong>To: </strong><a class="moz-txt-link-abbreviated" href="mailto:openjfx-dev@openjdk.org" target="_blank" rel="noopener noreferrer">openjfx-dev@openjdk.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:openjfx-dev@openjdk.org" target="_blank" rel="noopener noreferrer"><openjfx-dev@openjdk.org></a><br><strong>Subject: </strong>Re: Experiment: Node properties<br><br></div>
<p class="ms-outlook-mobile-reference-message skipProofing"> </p>
<div class="moz-cite-prefix">On 04/02/2026 22:17, Andy Goryachev wrote:</div>
<blockquote>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">I would like to share the results of a little experiment involving optimization of storage of Node properties. The basic idea is to create a compact fast map-like container to hold the rarely instantiated properties in order to reduce the application memory footprint.</div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">The savings are not overwhelming, but not exactly zero. I would imagine this optimization might be more interesting in any resource constrained environment such as Android / iOS / RaspberryPi. Please refer to [0] for the details.</div>
</blockquote>
<p class="ms-outlook-mobile-reference-message skipProofing">What trade off are you making here? It seems we're trading a small memory gain for more CPU use (extra indirection, walking a list linearly to find the correct property on each use/access VS no indirection, no list walking).</p>
<p class="ms-outlook-mobile-reference-message skipProofing">Are the resource constrained platforms you named generally memory or CPU constrained?</p>
<p class="ms-outlook-mobile-reference-message skipProofing">Have you investigated a breakdown of JavaFX memory use, and did the amount of memory used by properties come out on top here?</p>
<p class="ms-outlook-mobile-reference-message skipProofing">Would the gains you made here become irrelevant or less relevant with Compact Object Headers [<a class="moz-txt-link-freetext" style="margin-top: 0.0px; margin-bottom: 0.0px;" href="https://openjdk.org/jeps/519" target="_blank" rel="noopener noreferrer">https://openjdk.org/jeps/519</a>]</p>
<p class="ms-outlook-mobile-reference-message skipProofing"> </p>
<blockquote>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">I encourage you to try it with your application, to see whether you notice any change in memory consumption and/or performance. Let me know what you think!</div>
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<p class="ms-outlook-mobile-reference-message skipProofing">I like the idea, but I wonder if there really is much to gain here, and whether those gains will hold up with future Java improvements.</p>
<p class="ms-outlook-mobile-reference-message skipProofing">I think the property look-up system cannot reasonably be List (FastMap despite its name is a List). Converting this to a map however is likely to require a small object (like Map.Entry) which will further reduce any gains you made here I think.</p>
<p class="ms-outlook-mobile-reference-message skipProofing">--John</p>
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<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">Cheers,</div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">-andy</div>
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<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"><strong>References</strong></div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;"> </div>
<div class="ms-outlook-mobile-reference-message skipProofing" style="direction: ltr; font-family: 'Iosevka Fixed SS16' , Arial , Helvetica , sans-serif; font-size: 12.0pt; color: #000000;">[0] <a class="moz-txt-link-freetext" href="https://github.com/andy-goryachev-oracle/Test/blob/main/doc/Experiments/NodeProperties.md" target="_blank" rel="noopener noreferrer"> https://github.com/andy-goryachev-oracle/Test/blob/main/doc/Experiments/NodeProperties.md</a></div>
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