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Parallelize script verification

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* During block verification (when parallelism is requested), script
  check actions are stored instead of being executed immediately.
* After every processed transactions, its signature actions are
  pushed to a CScriptCheckQueue, which maintains a queue and some
  synchronization mechanism.
* Two or more threads (if enabled) start processing elements from
  this queue,
* When the block connection code is finished processing transactions,
  it joins the worker pool until the queue is empty.

As cs_main is held the entire time, and all verification must be
finished before the block continues processing, this does not reach
the best possible performance. It is a less drastic change than
some more advanced mechanisms (like doing verification out-of-band
entirely, and rolling back blocks when a failure is detected).

The -par=N flag controls the number of threads (1-16). 0 means auto,
and is the default.
This commit is contained in:
Pieter Wuille
2012-12-01 23:04:14 +01:00
parent 1d70f4bde8
commit f9cae832e6
7 changed files with 281 additions and 6 deletions
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15
src/main.h
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@@ -53,6 +53,8 @@ inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONE
static const int COINBASE_MATURITY = 100;
/** Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp. */
static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC
/** Maximum number of script-checking threads allowed */
static const int MAX_SCRIPTCHECK_THREADS = 16;
#ifdef USE_UPNP
static const int fHaveUPnP = true;
#else
@@ -90,6 +92,7 @@ extern unsigned char pchMessageStart[4];
extern bool fImporting;
extern bool fReindex;
extern bool fBenchmark;
extern int nScriptCheckThreads;
extern unsigned int nCoinCacheSize;
// Settings
@@ -107,6 +110,7 @@ class CCoins;
class CTxUndo;
class CCoinsView;
class CCoinsViewCache;
class CScriptCheck;
/** Register a wallet to receive updates from core */
void RegisterWallet(CWallet* pwalletIn);
@@ -136,6 +140,10 @@ bool ProcessMessages(CNode* pfrom);
bool SendMessages(CNode* pto, bool fSendTrickle);
/** Run the importer thread, which deals with reindexing, loading bootstrap.dat, and whatever is passed to -loadblock */
void ThreadImport(void *parg);
/** Run an instance of the script checking thread */
void ThreadScriptCheck(void* parg);
/** Stop the script checking threads */
void ThreadScriptCheckQuit();
/** Run the miner threads */
void GenerateBitcoins(bool fGenerate, CWallet* pwallet);
/** Generate a new block, without valid proof-of-work */
@@ -633,8 +641,11 @@ public:
bool HaveInputs(CCoinsViewCache &view) const;
// Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
// This does not modify the UTXO set
bool CheckInputs(CCoinsViewCache &view, bool fScriptChecks = true, unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC) const;
// This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it
// instead of being performed inline.
bool CheckInputs(CCoinsViewCache &view, bool fScriptChecks = true,
unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC,
std::vector<CScriptCheck> *pvChecks = NULL) const;
// Apply the effects of this transaction on the UTXO set represented by view
bool UpdateCoins(CCoinsViewCache &view, CTxUndo &txundo, int nHeight, const uint256 &txhash) const;