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tune: raise adaptive dbcache ceiling to 64 GiB on 64-bit hosts

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nMaxDbCache capped the adaptive UTXO/db cache (and a manual -dbcache) at 16 GiB, so the
help's "uses most of free RAM" was false above ~20 GB of RAM. Raise the 64-bit ceiling to
64 GiB. The adaptive controller + its RAM reserve still bound actual usage and shrink under
memory pressure, and small hosts are unaffected -- the ceiling only binds once RAM-minus-
reserve exceeds it. The coins cache grows lazily to the target, so nothing is pre-allocated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
DanS
2026-07-09 06:59:25 +02:00
parent 693d2290e0
commit a568ab628e
1 changed files with 1 additions and 1 deletions
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src/txdb.h
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@@ -52,7 +52,7 @@ class uint256;
//! -dbcache default (MiB)
static const int64_t nDefaultDbCache = 512;
//! max. -dbcache (MiB)
static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 65536 : 1024; // 64 GiB ceiling on 64-bit so adaptive dbcache can use most of RAM on large hosts (was 16384)
//! min. -dbcache in (MiB)
static const int64_t nMinDbCache = 4;