Bump default -dbcache to 1GiB #34763

1. 
   darosior commented at 8:02 pm on March 6, 2026: member

   This is an alternative to #34692 that does not introduce detection of system resources.
2. dbcache: remove memory restricted special case for warning 6c8087c233
3. dbcache: bump default from 450MB -> 1024MB 7b577a1239
4. doc: update dbcache default in reduce-memory.md 6ea1bdecbd
5. doc: add release notes for dbcache bump 153c7ff0ee
6. 
   DrahtBot commented at 8:03 pm on March 6, 2026: contributor

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   Possible typos and grammar issues:

   • “the UTXO database cache size, this defaults to 1024.” -> “the UTXO database cache size. It defaults to 1024.” [Comma splice creates a run-on sentence; splitting into two sentences improves clarity.]

   • “The unit is MiB (1024).” -> “The unit is MiB (1024 MiB) or clarify as MiB (1024^2 bytes)” ["(1024)" is ambiguous/unclear—it doesn’t state the unit or whether it means 1024 MiB or 1024^2 bytes; clarify the intended meaning.]

   2026-03-06 20:03:22

7. 
   andrewtoth commented at 8:07 pm on March 6, 2026: contributor

   ACK 153c7ff0eec9f1b3b60b059f422b9ce0e2c18540

   Either PR is fine with me.

8. 
   darosior commented at 8:12 pm on March 6, 2026: member

   Looks like the power that be made a decision! Closing this then.
9. darosior closed this on Mar 6, 2026

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10. 
    l0rinc commented at 8:36 pm on March 6, 2026: contributor

    post-close NACK - as discussed before, low-end machines can’t run with that much default - see #31645 and #34641 for details.
11. 
    darosior commented at 8:52 pm on March 6, 2026: member

    It is not a realistic expectation for a default to cover every single system the software can be ran on, this is the reason configuration options exist in the first place. Default values should be set for the vast majority of targeted systems.
12. 
    l0rinc commented at 9:33 pm on March 6, 2026: contributor

    It is not a realistic expectation for a default to cover every single system the software can be ran on

    Maybe, “every single” is a high bar, but we can probably calculate a good default for most, see https://github.com/bitcoin/bitcoin/pull/34641

13. 
    yancyribbens commented at 10:35 pm on March 6, 2026: contributor

    Looks like the power that be made a decision! Closing this then.

    Shakes fist the powers that be, after all, isnt that why why people are into decentralized and privacy focused projects..

    Anyway, I realize people are just trying to ship something, however I feel like maybe closing this PR was a bit premature, after all, there is another release after this one.. Personally this is more what I had in mind, too.

Contributors
darosior DrahtBot andrewtoth l0rinc yancyribbens