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Store fewer orphan tx by default, add -maxorphantx option

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There is no reason to store thousands of orphan transactions;
normally an orphan's parents will either be broadcast or
mined reasonably quickly.

This pull drops the maximum number of orphans from 10,000 down
to 100, and adds a command-line option (-maxorphantx) that is
just like -maxorphanblocks to override the default.
This commit is contained in:
Gavin Andresen 2014-09-10 14:08:03 -04:00
parent c74332c678
commit aa3c697e90
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GPG key ID: 7588242FBE38D3A8
3 changed files with 5 additions and 3 deletions
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1
src/init.cpp
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@ -226,6 +226,7 @@ std::string HelpMessage(HelpMessageMode mode)
strUsage += " -dbcache=<n> " + strprintf(_("Set database cache size in megabytes (%d to %d, default: %d)"), nMinDbCache, nMaxDbCache, nDefaultDbCache) + "\n";
strUsage += " -loadblock=<file> " + _("Imports blocks from external blk000??.dat file") + " " + _("on startup") + "\n";
strUsage += " -maxorphanblocks=<n> " + strprintf(_("Keep at most <n> unconnectable blocks in memory (default: %u)"), DEFAULT_MAX_ORPHAN_BLOCKS) + "\n";
strUsage += " -maxorphantx=<n> " + strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS) + "\n";
strUsage += " -par=<n> " + strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"), -(int)boost::thread::hardware_concurrency(), MAX_SCRIPTCHECK_THREADS, DEFAULT_SCRIPTCHECK_THREADS) + "\n";
strUsage += " -pid=<file> " + _("Specify pid file (default: bitcoind.pid)") + "\n";
strUsage += " -reindex " + _("Rebuild block chain index from current blk000??.dat files") + " " + _("on startup") + "\n";

3
src/main.cpp
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@ -3856,7 +3856,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
AddOrphanTx(tx, pfrom->GetId());
// DoS prevention: do not allow mapOrphanTransactions to grow unbounded
unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
unsigned int nMaxOrphanTx = (unsigned int)std::max((int64_t)0, GetArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
unsigned int nEvicted = LimitOrphanTxSize(nMaxOrphanTx);
if (nEvicted > 0)
LogPrint("mempool", "mapOrphan overflow, removed %u tx\n", nEvicted);
} else if (pfrom->fWhitelisted) {

4
src/main.h
View file

@ -51,8 +51,8 @@ static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
static const unsigned int MAX_P2SH_SIGOPS = 15;
/** The maximum number of sigops we're willing to relay/mine in a single tx */
static const unsigned int MAX_TX_SIGOPS = MAX_BLOCK_SIGOPS/5;
/** The maximum number of orphan transactions kept in memory */
static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
/** Default for -maxorphanblocks, maximum number of orphan blocks kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_BLOCKS = 750;
/** The maximum size of a blk?????.dat file (since 0.8) */