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[3.x] Make MessageQueue growable - #75527

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akien-mga merged 1 commit into
godotengine:3.xfrom
lawnjelly:growable_message_queue3
Apr 11, 2023
Merged

akien-mga merged 1 commit into
godotengine:3.xfrom
lawnjelly:growable_message_queue3

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@lawnjelly

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  • Uses simple vector resizing (po2)
  • Uses pair of read and write buffers

3.x version of #65740
See that PR for more details.

* Uses simple vector resizing (po2)
* Uses pair of read and write buffers
@lawnjelly
lawnjelly requested review from a team as code owners March 31, 2023 09:36
@lawnjelly lawnjelly added this to the 3.x milestone Mar 31, 2023
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We discussed the message queue PRs today and @reduz is fine with this one for 3.x, I've tested it quite a bit now, but if e.g. @KoBeWi or @RandomShaper or @akien-mga want to give a second look that would be welcome, so we can get approved and in for 3.6. 👍

reduz: It won't reduce. It stays at maximum size. I didn't use yours because I have some special requirements for it, mostly that I need to have one of those per thread group and they need to share the page pool for performance.
but we can merge yours for 3.x if you want

<member name="memory/limits/command_queue/multithreading_queue_size_kb" type="int" setter="" getter="" default="256">
</member>
<member name="memory/limits/message_queue/max_size_kb" type="int" setter="" getter="" default="4096">
<member name="memory/limits/message_queue/max_size_mb" type="int" setter="" getter="" default="32">

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Should we keep this in kB so we don't break compat on the property name?

@lawnjelly lawnjelly Apr 11, 2023

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I don't think breaking compatibility here matters all that much, as the new version grows / shrinks on demand, so the max value can be higher. Any old values stored will be overly low for new version, so in a way it makes more sense to change this name.

The default of 32 megs I think came from reduz PR, but it seems reasonable even on mobile. In most situations it will only use a few Kb, and peak only during e.g. loading. It's possible we could use a slightly smaller peak for mobile, but this kind of thing should become obvious with testing.

@akien-mga
akien-mga merged commit 632a544 into godotengine:3.x Apr 11, 2023
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Thanks!

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3 participants