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Decrease block time to 3s #3612

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First commit and no format
vncoelho Dec 5, 2024
91c4bd2
Start adjusting param but devcontainer not working
vncoelho Dec 5, 2024
9ba85d8
Merge branch 'master' into decreaseblocktime-3s
vncoelho Dec 6, 2024
a095496
Merge branch 'master' into decreaseblocktime-3s
Dec 6, 2024
3329c54
Update docs/config.json.md
vncoelho Dec 7, 2024
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Merge branch 'master' into decreaseblocktime-3s
vncoelho Dec 9, 2024
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format
vncoelho Dec 9, 2024
af42801
Merge branch 'master' into decreaseblocktime-3s
vncoelho Dec 10, 2024
9d677c5
Merge branch 'master' into decreaseblocktime-3s
shargon Dec 12, 2024
cd91440
Update src/Neo.CLI/config.fs.mainnet.json
shargon Dec 12, 2024
26b1e58
Update src/Neo.CLI/config.json
shargon Dec 12, 2024
3b52a3c
Update src/Neo.CLI/config.mainnet.json
shargon Dec 12, 2024
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Merge branch 'master' into decreaseblocktime-3s
Dec 17, 2024
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Merge branch 'master' into decreaseblocktime-3s
vncoelho Feb 1, 2025
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4 changes: 2 additions & 2 deletions benchmarks/Neo.Benchmarks/config.json
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Expand Up @@ -27,8 +27,8 @@
"ProtocolConfiguration": {
"Network": 860833102,
"AddressVersion": 53,
"MillisecondsPerBlock": 15000,
"MaxTransactionsPerBlock": 512,
"MillisecondsPerBlock": 3000,
"MaxTransactionsPerBlock": 256,
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@roman-khimov roman-khimov Dec 5, 2024

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MaxTransactionsPerBlock can be kept as is.

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@vncoelho vncoelho Dec 6, 2024

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I think it need to be changed, I think that this comment here contradicts your comment below. I did not understand. You said to cut even more aggressively.

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@AnnaShaleva AnnaShaleva Dec 6, 2024

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We need to reduce MaxTraceableBlocks, not MaxTransactionsPerBlock.

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@roman-khimov roman-khimov Dec 7, 2024

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C# node can handle several thousands of simple NEP-17 transfers per second. It's all about MaxBlockSystemFee (#3552), not MaxTransactionsPerBlock.

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@vncoelho vncoelho Dec 9, 2024

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I think that for a first release these proposed values are good.
They can be increased easily, the opposite is more complicated in my opnion.
So, I think we should just move forward.

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@Jim8y Jim8y Dec 17, 2024

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This actually increase the tps for neo, so 256 is acceptable.

"MemoryPoolMaxTransactions": 50000,
"MaxTraceableBlocks": 2102400,
"Hardforks": {
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4 changes: 2 additions & 2 deletions docs/config.json.md
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Expand Up @@ -42,10 +42,10 @@ This README provides an explanation for each field in the JSON configuration fil
- **AddressVersion**: Version byte used in Neo address generation. Default is `53`.

### MillisecondsPerBlock
- **MillisecondsPerBlock**: Time interval between blocks in milliseconds. Default is `15000` (15 seconds).
- **MillisecondsPerBlock**: Time interval between blocks in milliseconds. Default is `3000` (3 seconds).

### MaxTransactionsPerBlock
- **MaxTransactionsPerBlock**: Maximum number of transactions allowed per block. Default is `512`.
- **MaxTransactionsPerBlock**: Maximum number of transactions allowed per block. Default is `256`.

### MemoryPoolMaxTransactions
- **MemoryPoolMaxTransactions**: Maximum number of transactions that can be held in the memory pool. Default is `50000`.
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4 changes: 2 additions & 2 deletions src/Neo.CLI/config.fs.testnet.json
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Expand Up @@ -30,8 +30,8 @@
"ProtocolConfiguration": {
"Network": 91466898,
"AddressVersion": 53,
"MillisecondsPerBlock": 15000,
"MaxTransactionsPerBlock": 512,
"MillisecondsPerBlock": 3000,
"MaxTransactionsPerBlock": 256,
"MemoryPoolMaxTransactions": 50000,
"MaxTraceableBlocks": 17280,
"InitialGasDistribution": 5200000000000000,
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4 changes: 2 additions & 2 deletions src/Neo.CLI/config.testnet.json
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Expand Up @@ -30,8 +30,8 @@
"ProtocolConfiguration": {
"Network": 894710606,
"AddressVersion": 53,
"MillisecondsPerBlock": 15000,
"MaxTransactionsPerBlock": 5000,
"MillisecondsPerBlock": 3000,
"MaxTransactionsPerBlock": 256,
"MemoryPoolMaxTransactions": 50000,
"MaxTraceableBlocks": 2102400,
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@roman-khimov roman-khimov Dec 5, 2024

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Notice that it'd be ~73 days instead of current year. But I'd rather cut it down even more aggressively (see FS network settings).

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@vncoelho vncoelho Dec 6, 2024

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I agree, let's say 64 or 128?

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@roman-khimov roman-khimov Dec 9, 2024

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Opinions are welcome, your values remind me of E-letter chain. Nothing bad about that, but historic data (#2026) suggests our contracts are more used to somewhat longer history available. NeoFS networks use 17280 (3 days of 15s blocks).

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@AnnaShaleva AnnaShaleva Dec 17, 2024 •
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Just for the record, I have analyzed the blocks up to 6507174 height of N3 mainnet and checked all calls of native Ledger contract that affected by MaxTraceableBlocks setting (getBlock, getTransaction, getTransactionHeight, getTransactionFromBlock, getTransactionSigners, getTransactionVMState). Turns out that:

  1. There's only 5262 call to these APIs that successfully retrieve block and check if it's traceable. It's much lower than I expected.
  2. Contracts try to reach only very recent blocks, they don't go far than 11 blocks ago. In fact, most calls are trying to reach block accepted 1-5 blocks ago.
  3. Here's some statistics on calls:
PersistingBlockIndex - TargetBlockIndex The number of occurrences
1 921
2 3706
3 606
4 21
5 4
6 0
7 1
8 1
9 0
10 0
11 2
  1. Just in case, here's the log I gathered to track mainnet calls: traceable.log

So from what I see, from the real mainnet contracts' PoW we don't even need 73 days of traceable blocks. In fact, for existing contracts we're good with 1 day. But it's too harsh, and there are other parts of the node that depends on MaxTraceableBlocks setting (like related RPC calls, conflicting transactions tracking, tails cutting functionality and etc.). So I think that 3-7 days will be OK for mainnet.

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@vncoelho vncoelho Dec 23, 2024

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I think that, for now, let's keep the same parameter because, automatically, it will reduce proportionally.
So, from 73 days we go to 15.

Later we change in another PR.

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@roman-khimov roman-khimov Dec 23, 2024

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It's a year currently, that's the problem. It'd be 73 days, but that's too much also. Our headers are ~700 bytes, so 2M of headers is ~1.4 GB of data. If there is 1 transaction (~250 bytes) in a block that's +0.5 GB immediately. And no one needs this data (other than pure archival purposes).

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@vncoelho vncoelho Dec 23, 2024

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I see, I think it is a good reduce and it is not the purpose of this PR.
Maybe keep the current value will be adequated for now because it will also improve.

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@roman-khimov roman-khimov Dec 24, 2024

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OK, let's have #3644 for this. 3s consensus can have any MTB technically.

"Hardforks": {
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6 changes: 3 additions & 3 deletions src/Neo/ProtocolSettings.cs
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Expand Up @@ -69,7 +69,7 @@ public record ProtocolSettings
/// <summary>
/// The maximum increment of the <see cref="Transaction.ValidUntilBlock"/> field.
/// </summary>
public uint MaxValidUntilBlockIncrement => 86400000 / MillisecondsPerBlock;
public uint MaxValidUntilBlockIncrement => 86400000 / MillisecondsPerBlock; //TODO keep the same??
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@roman-khimov roman-khimov Dec 5, 2024

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This one is configurable per-network, so I'd rather leave the default as is and configure particular networks.

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@vncoelho vncoelho Dec 6, 2024

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ok


/// <summary>
/// Indicates the maximum number of transactions that can be contained in a block.
Expand Down Expand Up @@ -113,8 +113,8 @@ public record ProtocolSettings
StandbyCommittee = Array.Empty<ECPoint>(),
ValidatorsCount = 0,
SeedList = Array.Empty<string>(),
MillisecondsPerBlock = 15000,
MaxTransactionsPerBlock = 512,
MillisecondsPerBlock = 3000,
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@roman-khimov roman-khimov Dec 5, 2024

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I'm not sure we need to change defaults.

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@vncoelho vncoelho Dec 6, 2024

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I think it is better, @roman-khimov , because it may, in the future, reflect in some of our tests that use default. Better to keep consistent.

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@shargon shargon Dec 12, 2024

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Because we will change testnet only before, it's better to avoid default changes

MaxTransactionsPerBlock = 256,
MemoryPoolMaxTransactions = 50_000,
MaxTraceableBlocks = 2_102_400,
InitialGasDistribution = 52_000_000_00000000,
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3 changes: 3 additions & 0 deletions src/Neo/SmartContract/Native/NeoToken.cs
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Expand Up @@ -193,7 +193,10 @@ internal override ContractTask InitializeAsync(ApplicationEngine engine, Hardfor
engine.SnapshotCache.Add(CreateStorageKey(Prefix_Committee), new StorageItem(cachedCommittee));
engine.SnapshotCache.Add(_votersCount, new StorageItem(System.Array.Empty<byte>()));
engine.SnapshotCache.Add(CreateStorageKey(Prefix_GasPerBlock).AddBigEndian(0u), new StorageItem(5 * GAS.Factor));
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@vncoelho vncoelho Dec 9, 2024

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ping @shargon

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@vncoelho vncoelho Dec 9, 2024

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I think that maybe it should be enabled with 1 instead of 5 after certain height.
So the hardfork will be triggered by modification the SnapshotCache withnew StorageItem(5 * GAS.Factor);

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@shargon shargon Dec 12, 2024

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This should be moved to config.json?

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@roman-khimov roman-khimov Dec 12, 2024

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We can't change it without affecting post-genesis state. And I see zero reason to do this, mainnet/testnet don't care, this will be adjusted by the committee, private networks are fine with whatever default and they can also adjust it if needed.

// TODO - Add hardfork otherwise storage will be different
// After HARD FORK
engine.SnapshotCache.Add(_registerPrice, new StorageItem(1000 * GAS.Factor));

return Mint(engine, Contract.GetBFTAddress(engine.ProtocolSettings.StandbyValidators), TotalAmount, false);
}
return ContractTask.CompletedTask;
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4 changes: 2 additions & 2 deletions src/Plugins/DBFTPlugin/Consensus/ConsensusService.Check.cs
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Expand Up @@ -46,8 +46,8 @@ private bool CheckPrepareResponse()
}

// Timeout extension due to prepare response sent
// around 2*15/M=30.0/5 ~ 40% block time (for M=5)
ExtendTimerByFactor(2);
// around 4*3/M=12.0/5 ~ 80% block time (for M=5)
ExtendTimerByFactor(4);

Log($"Sending {nameof(PrepareResponse)}");
localNode.Tell(new LocalNode.SendDirectly { Inventory = context.MakePrepareResponse() });
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12 changes: 6 additions & 6 deletions src/Plugins/DBFTPlugin/Consensus/ConsensusService.OnMessage.cs
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Expand Up @@ -95,8 +95,8 @@ private void OnPrepareRequestReceived(ExtensiblePayload payload, PrepareRequest
}

// Timeout extension: prepare request has been received with success
// around 2*15/M=30.0/5 ~ 40% block time (for M=5)
ExtendTimerByFactor(2);
// around 4*3/M=12.0/5 ~ 80% block time (for M=5)
ExtendTimerByFactor(4);
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@shargon shargon Dec 12, 2024

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This should be computed according the configured time per block


context.Block.Header.Timestamp = message.Timestamp;
context.Block.Header.Nonce = message.Nonce;
Expand Down Expand Up @@ -171,8 +171,8 @@ private void OnPrepareResponseReceived(ExtensiblePayload payload, PrepareRespons
return;

// Timeout extension: prepare response has been received with success
// around 2*15/M=30.0/5 ~ 40% block time (for M=5)
ExtendTimerByFactor(2);
// around 4*3/M=12.0/5 ~ 80% block time (for M=5)
ExtendTimerByFactor(4);

Log($"{nameof(OnPrepareResponseReceived)}: height={message.BlockIndex} view={message.ViewNumber} index={message.ValidatorIndex}");
context.PreparationPayloads[message.ValidatorIndex] = payload;
Expand Down Expand Up @@ -210,8 +210,8 @@ private void OnCommitReceived(ExtensiblePayload payload, Commit commit)
if (commit.ViewNumber == context.ViewNumber)
{
// Timeout extension: commit has been received with success
// around 4*15s/M=60.0s/5=12.0s ~ 80% block time (for M=5)
ExtendTimerByFactor(4);
// around 6*3s/M=18.0s/5=12.0s ~ 120% block time (for M=5)
ExtendTimerByFactor(6);

Log($"{nameof(OnCommitReceived)}: height={commit.BlockIndex} view={commit.ViewNumber} index={commit.ValidatorIndex} nc={context.CountCommitted} nf={context.CountFailed}");

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2 changes: 1 addition & 1 deletion src/Plugins/StateService/Verification/VerificationContext.cs
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Expand Up @@ -27,7 +27,7 @@ namespace Neo.Plugins.StateService.Verification
{
class VerificationContext
{
private const uint MaxValidUntilBlockIncrement = 100;
private const uint MaxValidUntilBlockIncrement = 100; // Change to 500!??
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@roman-khimov roman-khimov Dec 5, 2024

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Whoa. Unexpected one. It's totally different from the "regular" MVUBI, but 500 here would let more ExtensiblePayloads with signatures float around the network, I doubt the intention here was to have it related to time.

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@shargon shargon Dec 5, 2024

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We should related it with the timeblock

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@vncoelho vncoelho Dec 6, 2024

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I think you guys should decide, that is why I left as comment.

private StateRoot root;
private ExtensiblePayload rootPayload;
private ExtensiblePayload votePayload;
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2 changes: 1 addition & 1 deletion tests/Neo.Network.RPC.Tests/RpcTestCases.json
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Expand Up @@ -3148,7 +3148,7 @@
"protocol": {
"network": 0,
"validatorscount": 0,
"msperblock": 15000,
"msperblock": 3000,
"maxvaliduntilblockincrement": 1,
"maxtraceableblocks": 1,
"addressversion": 0,
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4 changes: 2 additions & 2 deletions tests/Neo.Plugins.OracleService.Tests/config.json
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Expand Up @@ -30,8 +30,8 @@
"ProtocolConfiguration": {
"Network": 5195086,
"AddressVersion": 53,
"MillisecondsPerBlock": 15000,
"MaxTransactionsPerBlock": 512,
"MillisecondsPerBlock": 3000,
"MaxTransactionsPerBlock": 256,
"MemoryPoolMaxTransactions": 50000,
"MaxTraceableBlocks": 2102400,
"Hardforks": {
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2 changes: 1 addition & 1 deletion tests/Neo.UnitTests/SmartContract/Native/UT_NeoToken.cs
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Expand Up @@ -744,7 +744,7 @@ public void TestEconomicParameter()

(BigInteger, bool) result = Check_GetGasPerBlock(clonedCache, persistingBlock);
result.Item2.Should().BeTrue();
result.Item1.Should().Be(5 * NativeContract.GAS.Factor);
result.Item1.Should().Be(5 * NativeContract.GAS.Factor); // Test should occur with all hardfork enable TODO

persistingBlock = new Block { Header = new Header { Index = 10 } };
(VM.Types.Boolean, bool) result1 = Check_SetGasPerBlock(clonedCache, 10 * NativeContract.GAS.Factor, persistingBlock);
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6 changes: 3 additions & 3 deletions tests/Neo.UnitTests/UT_ProtocolSettings.cs
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Expand Up @@ -46,7 +46,7 @@ public void TestGetMemoryPoolMaxTransactions()
[TestMethod]
public void TestGetMillisecondsPerBlock()
{
TestProtocolSettings.Default.MillisecondsPerBlock.Should().Be(15000);
TestProtocolSettings.Default.MillisecondsPerBlock.Should().Be(3000);
}

[TestMethod]
Expand Down Expand Up @@ -131,8 +131,8 @@ internal static string CreateHFSettings(string hf)
""ProtocolConfiguration"": {
""Network"": 860833102,
""AddressVersion"": 53,
""MillisecondsPerBlock"": 15000,
""MaxTransactionsPerBlock"": 512,
""MillisecondsPerBlock"": 3000,
""MaxTransactionsPerBlock"": 256,
""MemoryPoolMaxTransactions"": 50000,
""MaxTraceableBlocks"": 2102400,
""Hardforks"": {
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4 changes: 2 additions & 2 deletions tests/Neo.UnitTests/test.config.json
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Expand Up @@ -25,8 +25,8 @@
"ProtocolConfiguration": {
"Network": 860833102,
"AddressVersion": 53,
"MillisecondsPerBlock": 15000,
"MaxTransactionsPerBlock": 512,
"MillisecondsPerBlock": 3000,
"MaxTransactionsPerBlock": 256,
"MemoryPoolMaxTransactions": 50000,
"MaxTraceableBlocks": 2102400,
"Hardforks": {},
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