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Fix `INACTIVITY_PENALTY_QUOTIENT` 

The amount of inactivity penalty was adjusted to half since we were applying penalty for missing FFG target and source. But now we only apply it for missing target, so `INACTIVITY_PENALTY_QUOTIENT` should be `2**24`.
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Hsiao-Wei Wang 2020-04-08 10:32:16 +08:00
parent 2a36f366ef
commit c10e59bdf7
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GPG Key ID: 95B070122902DEA4
3 changed files with 6 additions and 6 deletions
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4
configs/mainnet.yaml
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@ -122,8 +122,8 @@ BASE_REWARD_FACTOR: 64
WHISTLEBLOWER_REWARD_QUOTIENT: 512 WHISTLEBLOWER_REWARD_QUOTIENT: 512
# 2**3 (= 8) # 2**3 (= 8)
PROPOSER_REWARD_QUOTIENT: 8 PROPOSER_REWARD_QUOTIENT: 8
# 2**25 (= 33,554,432) # 2**24 (= 16,777,216)
INACTIVITY_PENALTY_QUOTIENT: 33554432 INACTIVITY_PENALTY_QUOTIENT: 16777216
# 2**5 (= 32) # 2**5 (= 32)
MIN_SLASHING_PENALTY_QUOTIENT: 32 MIN_SLASHING_PENALTY_QUOTIENT: 32

4
configs/minimal.yaml
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@ -122,8 +122,8 @@ BASE_REWARD_FACTOR: 64
WHISTLEBLOWER_REWARD_QUOTIENT: 512 WHISTLEBLOWER_REWARD_QUOTIENT: 512
# 2**3 (= 8) # 2**3 (= 8)
PROPOSER_REWARD_QUOTIENT: 8 PROPOSER_REWARD_QUOTIENT: 8
# 2**25 (= 33,554,432) # 2**24 (= 16,777,216)
INACTIVITY_PENALTY_QUOTIENT: 33554432 INACTIVITY_PENALTY_QUOTIENT: 16777216
# 2**5 (= 32) # 2**5 (= 32)
MIN_SLASHING_PENALTY_QUOTIENT: 32 MIN_SLASHING_PENALTY_QUOTIENT: 32

4
specs/phase0/beacon-chain.md
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@ -242,10 +242,10 @@ The following values are (non-configurable) constants used throughout the specif
| `BASE_REWARD_FACTOR` | `2**6` (= 64) | | `BASE_REWARD_FACTOR` | `2**6` (= 64) |
| `WHISTLEBLOWER_REWARD_QUOTIENT` | `2**9` (= 512) | | `WHISTLEBLOWER_REWARD_QUOTIENT` | `2**9` (= 512) |
| `PROPOSER_REWARD_QUOTIENT` | `2**3` (= 8) | | `PROPOSER_REWARD_QUOTIENT` | `2**3` (= 8) |
| `INACTIVITY_PENALTY_QUOTIENT` | `2**25` (= 33,554,432) | | `INACTIVITY_PENALTY_QUOTIENT` | `2**24` (= 16,777,216) |
| `MIN_SLASHING_PENALTY_QUOTIENT` | `2**5` (= 32) | | `MIN_SLASHING_PENALTY_QUOTIENT` | `2**5` (= 32) |
- The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12 epochs` (about 18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating validators to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline validators after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)`; so after `INVERSE_SQRT_E_DROP_TIME` epochs, it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`. - The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12` epochs (about 18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating validators to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline validators after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)`; so after `INVERSE_SQRT_E_DROP_TIME` epochs, it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
### Max operations per block ### Max operations per block