[OnChainConfig]叔块率目标值调整| uncle rate target

[jolestar]

Starcoin 自主网启动以来已经经过了近 3500 多个 epoch，截止到区块高度 844799，UTC 时间 2021-07-06T09:19:01，共 3519 个 epoch（当前每个 epoch 有 240 个区块）。

统计这 3519 个 epoch 的数据：

指标	值
目标出块时间	5000 毫秒
平均实际出块时间	5032 毫秒
叔块率平均值	107.72‰
叔块率中位数	104.66‰
叔块率最大值	216.66‰
叔块率最小值	41.66‰

以下是叔块率分布曲线统计结果：

结论

1. 共识算法的难度调整策略符合预期，可以使实际出块时间非常接近目标时间。
2. 叔块率相对稳定，网络状况良好。

但由于初始的叔块率目标太大（240‰ ），使得这段时间的叔块率一直没有达到目标，但出块速度已经调整到了最小值 5 秒钟。现在决定通过链上配置，调整叔块率目标到 100‰ 。

影响

1. 叔块率目标调整到 100‰ 后，当某个 epoch 的叔块率超过了 100‰，下一个 epoch 的出块目标时间将会自动增加，直到叔块率小于 100‰。按上面的统计结果，调整后出块时间会大于 5 秒。
2. Starcoin 的出块奖励会根据出块时间自动调整，所以出块时间大于 5 秒后，出块奖励也会等比增加。 但由于叔块率目标降低，奖励打包叔块的部分会变少，这一部分会受影响，STC 的 PoW 发行速度会略微降低。

提案信息

1. 提案id: 2
2. 发起账号: 0xb2aa52f94db4516c5beecef363af850a
3. 交易 0xc126c0df93aa3ffbb6aac9f9fb35ac98e0525d883bcf5e2cd574c921111f325a
4. 变更配置项 0x1::ConsensusConfig::ConsensusConfig 的 uncle_rate_target 的值从 240 改为 100，其他字段不变。

投票方式

https://poll.starcoin.org/polls/detail/2

如何确认链上配置

1. 查看当前链上的配置项

starcoin% contract get resource 0x1 0x1::Config::Config<0x1::ConsensusConfig::ConsensusConfig>

{
  "ok": {
    "abilities": 8,
    "type_": "0x00000000000000000000000000000001::Config::Config<0x00000000000000000000000000000001::ConsensusConfig::ConsensusConfig>",
    "value": [
      [
        "payload",
        {
          "Struct": {
            "abilities": 7,
            "type_": "0x00000000000000000000000000000001::ConsensusConfig::ConsensusConfig",
            "value": [
              [
                "uncle_rate_target",
                {
                  "U64": "240"
                }
              ],
              [
                "base_block_time_target",
                {
                  "U64": "10000"
                }
              ],
              [
                "base_reward_per_block",
                {
                  "U128": "10000000000"
                }
              ],
              [
                "base_reward_per_uncle_percent",
                {
                  "U64": "10"
                }
              ],
              [
                "epoch_block_count",
                {
                  "U64": "240"
                }
              ],
              [
                "base_block_difficulty_window",
                {
                  "U64": "24"
                }
              ],
              [
                "min_block_time_target",
                {
                  "U64": "5000"
                }
              ],
              [
                "max_block_time_target",
                {
                  "U64": "60000"
                }
              ],
              [
                "base_max_uncles_per_block",
                {
                  "U64": "2"
                }
              ],
              [
                "base_block_gas_limit",
                {
                  "U64": "50000000"
                }
              ],
              [
                "strategy",
                {
                  "U8": 3
                }
              ]
            ]
          }
        }
      ]
    ]
  }
}

2. 查看配置变更提案要改变的值

```bash
starcoin% contract get resource 0xb2aa52f94db4516c5beecef363af850a 0x1::Dao::Proposal<0x1::STC::STC,0x1::OnChainConfigDao::OnChainConfigUpdate<0x1::ConsensusConfig::ConsensusConfig>>

{
  "ok": {
    "abilities": 8,
    "type_": "0x00000000000000000000000000000001::Dao::Proposal<0x00000000000000000000000000000001::STC::STC, 0x00000000000000000000000000000001::OnChainConfigDao::OnChainConfigUpdate<0x00000000000000000000000000000001::ConsensusConfig::ConsensusConfig>>",
    "value": [
      [
        "id",
        {
          "U64": "2"
        }
      ],
      [
        "proposer",
        {
          "Address": "0xb2aa52f94db4516c5beecef363af850a"
        }
      ],
      [
        "start_time",
        {
          "U64": "1625657557931"
        }
      ],
      [
        "end_time",
        {
          "U64": "1626262357931"
        }
      ],
      [
        "for_votes",
        {
          "U128": "0"
        }
      ],
      [
        "against_votes",
        {
          "U128": "0"
        }
      ],
      [
        "eta",
        {
          "U64": "0"
        }
      ],
      [
        "action_delay",
        {
          "U64": "86400000"
        }
      ],
      [
        "quorum_votes",
        {
          "U128": "6776061411284000"
        }
      ],
      [
        "action",
        {
          "Struct": {
            "abilities": 7,
            "type_": "0x00000000000000000000000000000001::Option::Option<0x00000000000000000000000000000001::OnChainConfigDao::OnChainConfigUpdate<0x00000000000000000000000000000001::ConsensusConfig::ConsensusConfig>>",
            "value": [
              [
                "vec",
                {
                  "Vector": [
                    {
                      "Struct": {
                        "abilities": 7,
                        "type_": "0x00000000000000000000000000000001::OnChainConfigDao::OnChainConfigUpdate<0x00000000000000000000000000000001::ConsensusConfig::ConsensusConfig>",
                        "value": [
                          [
                            "value",
                            {
                              "Struct": {
                                "abilities": 7,
                                "type_": "0x00000000000000000000000000000001::ConsensusConfig::ConsensusConfig",
                                "value": [
                                  [
                                    "uncle_rate_target",
                                    {
                                      "U64": "100"
                                    }
                                  ],
                                  [
                                    "base_block_time_target",
                                    {
                                      "U64": "10000"
                                    }
                                  ],
                                  [
                                    "base_reward_per_block",
                                    {
                                      "U128": "10000000000"
                                    }
                                  ],
                                  [
                                    "base_reward_per_uncle_percent",
                                    {
                                      "U64": "10"
                                    }
                                  ],
                                  [
                                    "epoch_block_count",
                                    {
                                      "U64": "240"
                                    }
                                  ],
                                  [
                                    "base_block_difficulty_window",
                                    {
                                      "U64": "24"
                                    }
                                  ],
                                  [
                                    "min_block_time_target",
                                    {
                                      "U64": "5000"
                                    }
                                  ],
                                  [
                                    "max_block_time_target",
                                    {
                                      "U64": "60000"
                                    }
                                  ],
                                  [
                                    "base_max_uncles_per_block",
                                    {
                                      "U64": "2"
                                    }
                                  ],
                                  [
                                    "base_block_gas_limit",
                                    {
                                      "U64": "50000000"
                                    }
                                  ],
                                  [
                                    "strategy",
                                    {
                                      "U8": 3
                                    }
                                  ]
                                ]
                              }
                            }
                          ]
                        ]
                      }
                    }
                  ]
                }
              ]
            ]
          }
        }
      ]
    ]
  }
}

[mzcaptainyang]

后面是只会针对 Dapp 提供投票功能吗？

后面不支持命令行投票了吗？想要命令行的方式，这样可以尽量减少私钥的复制和导入

[jolestar]

后面是只会针对 Dapp 提供投票功能吗？

后面不支持命令行投票了吗？想要命令行的方式，这样可以尽量减少私钥的复制和导入

和上一个投票的命令一样，只是投票的 OnChainConfig 类型变为 0x1::ConsensusConfig::ConsensusConfig， id 变为 2

account execute-function -s 0xb2aa52f94db4516c5beecef363af850a --function 0x1::DaoVoteScripts::cast_vote -t 0x1::STC::STC -t 0x1::OnChainConfigDao::OnChainConfigUpdate<0x1::ConsensusConfig::ConsensusConfig> --arg 0xb2aa52f94db4516c5beecef363af850a --arg 2 --arg true --arg 1000000000u128 -b

[jolestar]

executed https://explorer.starcoin.org/main/transactions/detail/0xbf3ecd363c6f2d00bc3855d051fd3acc182304caf3e5dd547c19d302884f1cc2