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fix: cap indexed-node block-tree dbcache so adaptive dbcache feeds the UTXO set

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With -addressindex/-spentindex, nBlockTreeDBCache was set to 3/4 of nTotalCache. That
rule was sized for the old fixed 512 MiB dbcache default (~384 MiB), but adaptive
dbcache now makes nTotalCache multi-GB, so on indexed pool/explorer nodes ~3/4 of
several GB was diverted to the block-index LevelDB read cache -- far more than it can
use -- while starving the in-memory UTXO set that actually speeds IBD, and that chunk
is not shrinkable by the memory-pressure controller.

Measured on an 8 GiB box with -addressindex: 4420 MiB block-index cache + 1097 MiB
UTXO set, vs 3859 MiB UTXO on a plain node. Cap the index cache at 1 GiB (ample for
the index read cache; tunable) so the adaptive budget flows to the coins cache.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
DanS
2026-07-09 01:26:30 +02:00
parent 4e67e687d7
commit 4238da9bea
1 changed files with 7 additions and 1 deletions
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8
src/init.cpp
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@@ -2002,8 +2002,14 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
int64_t nBlockTreeDBCache = nTotalCache / 8;
if (GetBoolArg("-addressindex", DEFAULT_ADDRESSINDEX) || GetBoolArg("-spentindex", DEFAULT_SPENTINDEX)) {
// enable 3/4 of the cache if addressindex and/or spentindex is enabled
// Give indexed (address/spent-index) nodes a larger index LevelDB read cache, but CAP it.
// With adaptive dbcache, nTotalCache is now multi-GB, so 3/4 of it is several GB -- far more
// than the index cache can use, while starving the in-memory UTXO set that actually speeds
// IBD (and this chunk is not shrinkable by the memory-pressure controller, which only adjusts
// the coins cache). Cap at 1 GiB so the adaptive budget flows to the coins cache. Tunable.
nBlockTreeDBCache = nTotalCache * 3 / 4;
if (nBlockTreeDBCache > ((int64_t)1024 << 20))
nBlockTreeDBCache = ((int64_t)1024 << 20);
} else {
if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", false)) {
nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB