Optimize VerifyWitness and tx.verify #2054
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Plese wait for #2052 |
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November 25, 2020 10:47
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What does this optimize? |
We'll add adjustable opcode pricing later and also want to keep Therefore, we want to separate signature verification from cost verification. |
roman-khimov
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Nov 26, 2020
MemoryPool contents is always valid (verified) against some snapshot. This snapshot is only changed when new block is added. Between blocks we only have one valid chain state that can be read by multiple threads without any issues, thus we can execute concurrently not only state-independent, but also state-dependent parts of transaction verification. To simplify execution flow (minimize single-threaded Blockchain message handling and eliminate duplicate DB accesses for ContainsTransaction) TransactionRouter is an independent entity now, though of course we can also attach the same actor functionality to MemoryPool itself. TransactionVerificationContext balance checking is moved to MemoryPool from Transaction with this, Transaction shouldn't care (it can check overall GAS balance though). This is directly related to neo-project#2045 work (it solves state access problem there) and in some sense is an alternative to neo-project#2054 (makes fee calculation easier, though IsStandardContract() trick to optimize out these contracts during reverification is still relevant and can be added here). At this stage it's just a prototype, some additional optimizations and simplifications are possible of course, but this prototype shows the direction and the main question for now is whether this direction is interesting for us.
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Conflicts. |
added 2 commits
December 2, 2020 14:24
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Attached is TPS comparison between this PR and newest master branch code. Env: 1 consensus node with 6 i7 cores and 16 GB rams
Besides, a TPS comparison between the newest master branch code and commit 6fc4161:
It seems that TPS has dropped since then. |
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Looks like a revert from #1507 |
Some partes is reverted. |
erikzhang
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Dec 2, 2020
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December 2, 2020 20:10
erikzhang
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Dec 2, 2020
shargon
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Dec 2, 2020
| if (witnesses[i].VerificationScript.IsSignatureContract()) | ||
| net_fee -= (ApplicationEngine.OpCodePrices[OpCode.PUSHDATA1] * 2 + ApplicationEngine.OpCodePrices[OpCode.PUSHNULL] + ApplicationEngine.OpCodePrices[OpCode.SYSCALL] + ApplicationEngine.ECDsaVerifyPrice); | ||
| else if (witnesses[i].VerificationScript.IsMultiSigContract(out int m, out int n)) | ||
| net_fee -= (ApplicationEngine.OpCodePrices[OpCode.PUSHDATA1] * (m + n) + ApplicationEngine.OpCodePrices[OpCode.PUSHINT8] * 2 + ApplicationEngine.OpCodePrices[OpCode.PUSHNULL] + ApplicationEngine.OpCodePrices[OpCode.SYSCALL] + ApplicationEngine.ECDsaVerifyPrice * n); |
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It could be any kind of push, same price but just to take care..
shargon
reviewed
Dec 2, 2020
| UInt160[] hashes = GetScriptHashesForVerifying(null); | ||
| if (hashes.Length != witnesses.Length) return VerifyResult.Invalid; | ||
| for (int i = 0; i < hashes.Length; i++) | ||
| if (witnesses[i].VerificationScript.IsStandardContract()) |
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Maybe we can cache if it's standar inside the witness, otherwise we check it at least twice.
shargon
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Dec 2, 2020
shargon
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Dec 3, 2020
Co-authored-by: Shargon <shargon@gmail.com>
erikzhang
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Dec 3, 2020
shargon
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Dec 3, 2020
Co-authored-by: Shargon <shargon@gmail.com>
erikzhang
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Dec 4, 2020
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December 4, 2020 15:23
erikzhang
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Dec 4, 2020
erikzhang
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Dec 4, 2020
shargon
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Dec 4, 2020
| return true; | ||
| } | ||
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| internal static bool VerifyWitness(this IVerifiable verifiable, StoreView snapshot, UInt160 hash, Witness witness, long gas, out long fee) |
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fee it's only computed if it return true, it works for our current model, but we should take care.
shargon
approved these changes
Dec 4, 2020
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Merge? |
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