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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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40
src/main.cpp
View File

@@ -10,6 +10,7 @@
#include "net.h"
#include "init.h"
#include "ui_interface.h"
#include "checkqueue.h"
#include <boost/algorithm/string/replace.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
@@ -40,6 +41,7 @@ uint256 hashBestChain = 0;
CBlockIndex* pindexBest = NULL;
set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid; // may contain all CBlockIndex*'s that have validness >=BLOCK_VALID_TRANSACTIONS, and must contain those who aren't failed
int64 nTimeBestReceived = 0;
int nScriptCheckThreads = 0;
bool fImporting = false;
bool fReindex = false;
bool fBenchmark = false;
@@ -1360,10 +1362,13 @@ bool VerifySignature(const CCoins& txFrom, const CTransaction& txTo, unsigned in
return CScriptCheck(txFrom, txTo, nIn, flags, nHashType)();
}
bool CTransaction::CheckInputs(CCoinsViewCache &inputs, bool fScriptChecks, unsigned int flags) const
bool CTransaction::CheckInputs(CCoinsViewCache &inputs, bool fScriptChecks, unsigned int flags, std::vector<CScriptCheck> *pvChecks) const
{
if (!IsCoinBase())
{
if (pvChecks)
pvChecks->reserve(vin.size());
// This doesn't trigger the DoS code on purpose; if it did, it would make it easier
// for an attacker to attempt to split the network.
if (!HaveInputs(inputs))
@@ -1416,8 +1421,12 @@ bool CTransaction::CheckInputs(CCoinsViewCache &inputs, bool fScriptChecks, unsi
const CCoins &coins = inputs.GetCoins(prevout.hash);
// Verify signature
if (!VerifySignature(coins, *this, i, flags, 0))
return DoS(100,error("CheckInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
CScriptCheck check(coins, *this, i, flags, 0);
if (pvChecks) {
pvChecks->push_back(CScriptCheck());
check.swap(pvChecks->back());
} else if (!check())
return DoS(100,false);
}
}
}
@@ -1567,6 +1576,19 @@ void static FlushBlockFile()
bool FindUndoPos(int nFile, CDiskBlockPos &pos, unsigned int nAddSize);
static CCheckQueue<CScriptCheck> scriptcheckqueue(128);
void ThreadScriptCheck(void*) {
vnThreadsRunning[THREAD_SCRIPTCHECK]++;
RenameThread("bitcoin-scriptch");
scriptcheckqueue.Thread();
vnThreadsRunning[THREAD_SCRIPTCHECK]--;
}
void ThreadScriptCheckQuit() {
scriptcheckqueue.Quit();
}
bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJustCheck)
{
// Check it again in case a previous version let a bad block in
@@ -1607,6 +1629,8 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
CBlockUndo blockundo;
CCheckQueueControl<CScriptCheck> control(fScriptChecks && nScriptCheckThreads ? &scriptcheckqueue : NULL);
int64 nStart = GetTimeMicros();
int64 nFees = 0;
int nInputs = 0;
@@ -1638,8 +1662,10 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
nFees += tx.GetValueIn(view)-tx.GetValueOut();
if (!tx.CheckInputs(view, fScriptChecks, fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE))
std::vector<CScriptCheck> vChecks;
if (!tx.CheckInputs(view, fScriptChecks, fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE, nScriptCheckThreads ? &vChecks : NULL))
return false;
control.Add(vChecks);
}
CTxUndo txundo;
@@ -1656,6 +1682,12 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
return error("ConnectBlock() : coinbase pays too much (actual=%"PRI64d" vs limit=%"PRI64d")", vtx[0].GetValueOut(), GetBlockValue(pindex->nHeight, nFees));
if (!control.Wait())
return DoS(100, false);
int64 nTime2 = GetTimeMicros() - nStart;
if (fBenchmark)
printf("- Verify %u txins: %.2fms (%.3fms/txin)\n", nInputs - 1, 0.001 * nTime2, nInputs <= 1 ? 0 : 0.001 * nTime2 / (nInputs-1));
if (fJustCheck)
return true;