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Merge #10133: Clean up calculations of pcoinsTip memory usage

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1b55e07 Make threshold for flushing more conservative. (Alex Morcos)
f33afd3 Lower default memory footprint slightly (Alex Morcos)
5b95a19 Make pcoinsTip memory calculations consistent (Alex Morcos)

Tree-SHA512: d0061138596cf89008397b8729d9b25293938b1ad454cc99a6fe2f6210e94f76dfa78a8f0fce4c1ba3efec4e742a9c1a3ab26676a4a8346d3e7c3055d032669b
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Wladimir J. van der Laan 2017-04-05 08:08:02 +02:00
commit 5fc6a77aa6
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2 changed files with 11 additions and 4 deletions
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8
src/txdb.h
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@ -21,8 +21,14 @@ class CBlockIndex;
class CCoinsViewDBCursor;
class uint256;
//! Compensate for extra memory peak (x1.5-x1.9) at flush time.
static constexpr int DB_PEAK_USAGE_FACTOR = 2;
//! No need to periodic flush if at least this much space still available.
static constexpr int MAX_BLOCK_COINSDB_USAGE = 200 * DB_PEAK_USAGE_FACTOR;
//! Always periodic flush if less than this much space still available.
static constexpr int MIN_BLOCK_COINSDB_USAGE = 50 * DB_PEAK_USAGE_FACTOR;
//! -dbcache default (MiB)
static const int64_t nDefaultDbCache = 300;
static const int64_t nDefaultDbCache = 450;
//! max. -dbcache (MiB)
static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
//! min. -dbcache (MiB)

7
src/validation.cpp
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@ -2006,10 +2006,11 @@ bool static FlushStateToDisk(CValidationState &state, FlushStateMode mode, int n
nLastSetChain = nNow;
}
int64_t nMempoolSizeMax = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
int64_t cacheSize = pcoinsTip->DynamicMemoryUsage() * 2; // Compensate for extra memory peak (x1.5-x1.9) at flush time.
int64_t cacheSize = pcoinsTip->DynamicMemoryUsage() * DB_PEAK_USAGE_FACTOR;
int64_t nTotalSpace = nCoinCacheUsage + std::max<int64_t>(nMempoolSizeMax - nMempoolUsage, 0);
// The cache is large and we're within 10% and 100 MiB of the limit, but we have time now (not in the middle of a block processing).
bool fCacheLarge = mode == FLUSH_STATE_PERIODIC && cacheSize > std::max((9 * nTotalSpace) / 10, nTotalSpace - 100 * 1024 * 1024);
// The cache is large and we're within 10% and 200 MiB or 50% and 50MiB of the limit, but we have time now (not in the middle of a block processing).
bool fCacheLarge = mode == FLUSH_STATE_PERIODIC && cacheSize > std::min(std::max(nTotalSpace / 2, nTotalSpace - MIN_BLOCK_COINSDB_USAGE * 1024 * 1024),
std::max((9 * nTotalSpace) / 10, nTotalSpace - MAX_BLOCK_COINSDB_USAGE * 1024 * 1024));
// The cache is over the limit, we have to write now.
bool fCacheCritical = mode == FLUSH_STATE_IF_NEEDED && cacheSize > nTotalSpace;
// It's been a while since we wrote the block index to disk. Do this frequently, so we don't need to redownload after a crash.